TY  - JOUR
AU  - Gaković, Biljana
AU  - Zamfirescu, Marian
AU  - Panjan, Peter
AU  - Luculescu, Catalin Romeo
AU  - Albu, Catalina
AU  - Petrović, Suzana
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12713
AB  - The study of ablation and the laser-induced periodic surface structure (LIPSS) creation during the static and dynamic ultrafast laser (UFL) processing of the Al2O3/TiAlN protective coating is reported. The static irradiation was done with 10 successive pulses while scanning irradiation was performed with sample scanning. The laser ablation was studied by analysis of the surface morphology and elemental composition. The selective ablations manifest as circular craters or lines/micro-channels. The borders are very sharp without debris and hydrodynamic features. LIPSSs were formed at the bottoms of craters and microchannels. The periodicity of the created LIPSSs has shown a trend of increase with the pulse energy. Depending on the applied laser fuence the elemental composition in the centre of the craters confrmed the complete removal of the Al2O3 layer and partial ablation of the second TiAlN. The Al2O3 layer and part of TiAlN were ablated in micro-channels too.
T2  - Optical and Quantum Electronics
T1  - Laser ablation and LIPSS formation at static and dynamic multi-pulse regime on protective Al2O3/TiAlN coating
VL  - 56
IS  - 4
DO  - 10.1007/s11082-023-06238-x
ER  - 

@article{
author = "Gaković, Biljana and Zamfirescu, Marian and Panjan, Peter and Luculescu, Catalin Romeo and Albu, Catalina and Petrović, Suzana",
year = "2024",
abstract = "The study of ablation and the laser-induced periodic surface structure (LIPSS) creation during the static and dynamic ultrafast laser (UFL) processing of the Al2O3/TiAlN protective coating is reported. The static irradiation was done with 10 successive pulses while scanning irradiation was performed with sample scanning. The laser ablation was studied by analysis of the surface morphology and elemental composition. The selective ablations manifest as circular craters or lines/micro-channels. The borders are very sharp without debris and hydrodynamic features. LIPSSs were formed at the bottoms of craters and microchannels. The periodicity of the created LIPSSs has shown a trend of increase with the pulse energy. Depending on the applied laser fuence the elemental composition in the centre of the craters confrmed the complete removal of the Al2O3 layer and partial ablation of the second TiAlN. The Al2O3 layer and part of TiAlN were ablated in micro-channels too.",
journal = "Optical and Quantum Electronics",
title = "Laser ablation and LIPSS formation at static and dynamic multi-pulse regime on protective Al2O3/TiAlN coating",
volume = "56",
number = "4",
doi = "10.1007/s11082-023-06238-x"
}

Gaković, B., Zamfirescu, M., Panjan, P., Luculescu, C. R., Albu, C.,& Petrović, S.. (2024). Laser ablation and LIPSS formation at static and dynamic multi-pulse regime on protective Al2O3/TiAlN coating. in Optical and Quantum Electronics, 56(4).
https://doi.org/10.1007/s11082-023-06238-x

Gaković B, Zamfirescu M, Panjan P, Luculescu CR, Albu C, Petrović S. Laser ablation and LIPSS formation at static and dynamic multi-pulse regime on protective Al2O3/TiAlN coating. in Optical and Quantum Electronics. 2024;56(4).
doi:10.1007/s11082-023-06238-x .

Gaković, Biljana, Zamfirescu, Marian, Panjan, Peter, Luculescu, Catalin Romeo, Albu, Catalina, Petrović, Suzana, "Laser ablation and LIPSS formation at static and dynamic multi-pulse regime on protective Al2O3/TiAlN coating" in Optical and Quantum Electronics, 56, no. 4 (2024),
https://doi.org/10.1007/s11082-023-06238-x . .

TY  - CONF
AU  - Božinović, Nevena
AU  - Petrović, Suzana
AU  - Novaković, Mirjana
AU  - Rajić, Vladimir
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12323
AB  - In scientific and commericial needs, there was a great demand for the modification of biomaterials that would replace damaged tissue in the body. Today, titanium alloys are mostly used for these purposes in combination with metals of similar physicochemical properties. In this context, there is an increased interest in the development of novel biocompatible materials with enhanced surface interface. The experimental results of a Ti/Zr/Ti thin film system deposited on a substrate pre-patterned by a dynamic femtosecond laser are presented. Surface pattering with micrometre characteristics in the form of spikes is being investigated in order to generate arrayed surface patterns for biomedical pruposes. Femtosecond laser pulses were used to acquire black silicon surfaces adorned with conical structures under 0,65 bar in SF6 ambient pressure. The silicon surface contains high aspect ratio spikes with conical morphologies of about 2μm, 400 angle opening, and 13·106 cm-2 density that is roughly uniform over the treatment area. Ion sputtering was employed on sech a prepared surface to make a unique composite thin film composed of two layers of Ti and a subsurface layer of Zr. The deposited Ti/Zr/Ti cpomiste has a thickness of 400 nm. The composition and surface morphology were evaluated using FESEM-EDS and XPS methods. Transmission electron spectroscopy and energy dispersive X-ray spectroscopy demonstrated that post-deposition of Ti/Zr/Ti over Si laser-patterned resulted in diffusion of Ti and Zr layers.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
T1  - Thin film deposition of multilayers on silicon substrate laser pre-patterned
SP  - 51
EP  - 51
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12323
ER  - 

@conference{
author = "Božinović, Nevena and Petrović, Suzana and Novaković, Mirjana and Rajić, Vladimir",
year = "2023",
abstract = "In scientific and commericial needs, there was a great demand for the modification of biomaterials that would replace damaged tissue in the body. Today, titanium alloys are mostly used for these purposes in combination with metals of similar physicochemical properties. In this context, there is an increased interest in the development of novel biocompatible materials with enhanced surface interface. The experimental results of a Ti/Zr/Ti thin film system deposited on a substrate pre-patterned by a dynamic femtosecond laser are presented. Surface pattering with micrometre characteristics in the form of spikes is being investigated in order to generate arrayed surface patterns for biomedical pruposes. Femtosecond laser pulses were used to acquire black silicon surfaces adorned with conical structures under 0,65 bar in SF6 ambient pressure. The silicon surface contains high aspect ratio spikes with conical morphologies of about 2μm, 400 angle opening, and 13·106 cm-2 density that is roughly uniform over the treatment area. Ion sputtering was employed on sech a prepared surface to make a unique composite thin film composed of two layers of Ti and a subsurface layer of Zr. The deposited Ti/Zr/Ti cpomiste has a thickness of 400 nm. The composition and surface morphology were evaluated using FESEM-EDS and XPS methods. Transmission electron spectroscopy and energy dispersive X-ray spectroscopy demonstrated that post-deposition of Ti/Zr/Ti over Si laser-patterned resulted in diffusion of Ti and Zr layers.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts",
title = "Thin film deposition of multilayers on silicon substrate laser pre-patterned",
pages = "51-51",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12323"
}

Božinović, N., Petrović, S., Novaković, M.,& Rajić, V.. (2023). Thin film deposition of multilayers on silicon substrate laser pre-patterned. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
Belgrade : Institute of Technical Sciences of SASA., 51-51.
https://hdl.handle.net/21.15107/rcub_vinar_12323

Božinović N, Petrović S, Novaković M, Rajić V. Thin film deposition of multilayers on silicon substrate laser pre-patterned. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts. 2023;:51-51.
https://hdl.handle.net/21.15107/rcub_vinar_12323 .

Božinović, Nevena, Petrović, Suzana, Novaković, Mirjana, Rajić, Vladimir, "Thin film deposition of multilayers on silicon substrate laser pre-patterned" in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts (2023):51-51,
https://hdl.handle.net/21.15107/rcub_vinar_12323 .

TY  - JOUR
AU  - Božinović, Nevena
AU  - Savva, Kyriaki
AU  - Rajić, Vladimir
AU  - Popović, Maja
AU  - Tošić, Dragana
AU  - Janjetović, Kristina
AU  - Despotović, Ana
AU  - Zogović, Nevena
AU  - Stratakis, Emmanuel
AU  - Petrović, Suzana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11547
AB  - The creation of novel biocompatible Ti-based thin films with a Zr or Cu sub-layer modified by ultrafast laser processing is studied. To prepare bioactive surfaces, ultrafast laser processing is focused on the formation of laser-induced periodic surface structures (LIPSS) with the production of oxide phases at the surfaces. Two differently designed multilayer thin films Ti/Cu/Ti and Ti/Zr/Ti were deposited on the silicon using the ion sputtering method. The Ti thin film contains Cu or Zr sub-layer (thickness of 10 nm) at the 10 nm below the surface. The composition and surface morphology variations for these systems, deposited and laser-processed under the same experimental conditions, were caused only by different thermo-physical properties of the sub-layer (Cu or Zr). The surface morphology in the form of LIPSS, led to improved cell adhesion and stable cells/thin films interface compared to as-deposited samples. Field-emission scanning electron microscopy and MTT analysis revealed that laser processing of both systems increased cell adhesion, proliferation, and metabolical activity of L929 mouse fibroblast cells compared to non-modified flat surfaces. Overall, the biocompatibility of Zrcontaining thin films is better than Ti/Cu/Ti system. Further, laser processing and formation of LIPSS makes Ti/Zr/Ti thin films excellent candidate for biomedical
T2  - Materials Chemistry and Physics
T1  - Influence of zirconium and copper sub-layer in cell integrations on femtosecond laser-processed Ti thin films
VL  - 308
SP  - 128286
DO  - 10.1016/j.matchemphys.2023.128286
ER  - 

@article{
author = "Božinović, Nevena and Savva, Kyriaki and Rajić, Vladimir and Popović, Maja and Tošić, Dragana and Janjetović, Kristina and Despotović, Ana and Zogović, Nevena and Stratakis, Emmanuel and Petrović, Suzana",
year = "2023",
abstract = "The creation of novel biocompatible Ti-based thin films with a Zr or Cu sub-layer modified by ultrafast laser processing is studied. To prepare bioactive surfaces, ultrafast laser processing is focused on the formation of laser-induced periodic surface structures (LIPSS) with the production of oxide phases at the surfaces. Two differently designed multilayer thin films Ti/Cu/Ti and Ti/Zr/Ti were deposited on the silicon using the ion sputtering method. The Ti thin film contains Cu or Zr sub-layer (thickness of 10 nm) at the 10 nm below the surface. The composition and surface morphology variations for these systems, deposited and laser-processed under the same experimental conditions, were caused only by different thermo-physical properties of the sub-layer (Cu or Zr). The surface morphology in the form of LIPSS, led to improved cell adhesion and stable cells/thin films interface compared to as-deposited samples. Field-emission scanning electron microscopy and MTT analysis revealed that laser processing of both systems increased cell adhesion, proliferation, and metabolical activity of L929 mouse fibroblast cells compared to non-modified flat surfaces. Overall, the biocompatibility of Zrcontaining thin films is better than Ti/Cu/Ti system. Further, laser processing and formation of LIPSS makes Ti/Zr/Ti thin films excellent candidate for biomedical",
journal = "Materials Chemistry and Physics",
title = "Influence of zirconium and copper sub-layer in cell integrations on femtosecond laser-processed Ti thin films",
volume = "308",
pages = "128286",
doi = "10.1016/j.matchemphys.2023.128286"
}

Božinović, N., Savva, K., Rajić, V., Popović, M., Tošić, D., Janjetović, K., Despotović, A., Zogović, N., Stratakis, E.,& Petrović, S.. (2023). Influence of zirconium and copper sub-layer in cell integrations on femtosecond laser-processed Ti thin films. in Materials Chemistry and Physics, 308, 128286.
https://doi.org/10.1016/j.matchemphys.2023.128286

Božinović N, Savva K, Rajić V, Popović M, Tošić D, Janjetović K, Despotović A, Zogović N, Stratakis E, Petrović S. Influence of zirconium and copper sub-layer in cell integrations on femtosecond laser-processed Ti thin films. in Materials Chemistry and Physics. 2023;308:128286.
doi:10.1016/j.matchemphys.2023.128286 .

Božinović, Nevena, Savva, Kyriaki, Rajić, Vladimir, Popović, Maja, Tošić, Dragana, Janjetović, Kristina, Despotović, Ana, Zogović, Nevena, Stratakis, Emmanuel, Petrović, Suzana, "Influence of zirconium and copper sub-layer in cell integrations on femtosecond laser-processed Ti thin films" in Materials Chemistry and Physics, 308 (2023):128286,
https://doi.org/10.1016/j.matchemphys.2023.128286 . .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Božinović, Nevena
AU  - Rajić, Vladimir
AU  - Stanisavljević Ninković, Danijela
AU  - Kisić, Danilo
AU  - Stevanović, Milena J.
AU  - Stratakis, Emmanuel
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11368
AB  - Arranged patterns obtained via ultrafast laser processing on the surface of Ti/Cu/Ti/Si and Ti/Zr/Ti/Si thin-film systems are reported. Two differently designed multilayer thin films Ti/Cu/Ti/Si and Ti/Zr/Ti/Si were deposited on silicon using the ion sputtering method. The bioactive surfaces of these systems involve the formation of laser-induced periodic surface structures (LIPSS) in each of the laser-written lines of mesh patterns on 5 × 5 mm areas. The formation of nano- and micro-patterns with an ultra-thin oxide film on the surfaces was used to observe the effects of morphology and proliferation of the MRC-5 cell culture line. To determine whether Ti-based thin films have a toxic effect on living cells, an MTT assay was performed. The relative cytotoxic effect, as a percentage of surviving cells, showed that there was no difference in cell number between the Ti-based thin films and the control cells. There was also no difference in the viability of the MRC-5 cells, except for the Ti/Cu/Ti/Si system, where there was a slight 10% decrease in cell viability. © 2023 by the authors.
T2  - Coatings
T1  - Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems
VL  - 13
IS  - 6
SP  - 1107
DO  - 10.3390/coatings13061107
ER  - 

@article{
author = "Petrović, Suzana and Božinović, Nevena and Rajić, Vladimir and Stanisavljević Ninković, Danijela and Kisić, Danilo and Stevanović, Milena J. and Stratakis, Emmanuel",
year = "2023",
abstract = "Arranged patterns obtained via ultrafast laser processing on the surface of Ti/Cu/Ti/Si and Ti/Zr/Ti/Si thin-film systems are reported. Two differently designed multilayer thin films Ti/Cu/Ti/Si and Ti/Zr/Ti/Si were deposited on silicon using the ion sputtering method. The bioactive surfaces of these systems involve the formation of laser-induced periodic surface structures (LIPSS) in each of the laser-written lines of mesh patterns on 5 × 5 mm areas. The formation of nano- and micro-patterns with an ultra-thin oxide film on the surfaces was used to observe the effects of morphology and proliferation of the MRC-5 cell culture line. To determine whether Ti-based thin films have a toxic effect on living cells, an MTT assay was performed. The relative cytotoxic effect, as a percentage of surviving cells, showed that there was no difference in cell number between the Ti-based thin films and the control cells. There was also no difference in the viability of the MRC-5 cells, except for the Ti/Cu/Ti/Si system, where there was a slight 10% decrease in cell viability. © 2023 by the authors.",
journal = "Coatings",
title = "Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems",
volume = "13",
number = "6",
pages = "1107",
doi = "10.3390/coatings13061107"
}

Petrović, S., Božinović, N., Rajić, V., Stanisavljević Ninković, D., Kisić, D., Stevanović, M. J.,& Stratakis, E.. (2023). Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems. in Coatings, 13(6), 1107.
https://doi.org/10.3390/coatings13061107

Petrović S, Božinović N, Rajić V, Stanisavljević Ninković D, Kisić D, Stevanović MJ, Stratakis E. Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems. in Coatings. 2023;13(6):1107.
doi:10.3390/coatings13061107 .

Petrović, Suzana, Božinović, Nevena, Rajić, Vladimir, Stanisavljević Ninković, Danijela, Kisić, Danilo, Stevanović, Milena J., Stratakis, Emmanuel, "Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems" in Coatings, 13, no. 6 (2023):1107,
https://doi.org/10.3390/coatings13061107 . .

TY  - JOUR
AU  - Božinović, Nevena
AU  - Rajić, Vladimir
AU  - Kisić, Danilo
AU  - Milovanović, Dubravka S.
AU  - Savović, Jelena
AU  - Petrović, Suzana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10371
AB  - In this study, the design of surface pattering with the co-existence of micrometer and nanometer features was carried out to improve the arrayed surface structures on Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayer thin films by picosecond laser processing. The novel composite structure consisted of two layers of Ti and subsurface distributed Cu and Zr layers (thickness of 10 nm) were deposited by ion sputtering on Si substrate to the total thickness of 300 nm. The changes in the composition, surface morphology, and wetting properties after laser modification was monitored by Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM–EDS), optical profilometry, and wettability measurements. It was found that laser irradiation can induce the melting of material with the formation of wrinkled periodic structures at the edges of the laser spots in both systems as a consequence of the hydrodynamic effects. Another interesting result was that the periodic structure in form of LSFL (low spatial frequency LIPSS) ripples was numerous but slightly pronounced in Ti/Cu/Zr/Ti, due to the presence of the Zr component as an ultra-thin subsurface layer, which most likely favored creating LIPSS. Such laser texturing has been used in the biomedical field as a method of developing surface topography, coated with oxides to potentially improve cell response via suitable surface wetting for a biological system.
T2  - Optical and Quantum Electronics
T1  - Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films
VL  - 54
IS  - 9
SP  - 561
DO  - 10.1007/s11082-022-03910-6
ER  - 

@article{
author = "Božinović, Nevena and Rajić, Vladimir and Kisić, Danilo and Milovanović, Dubravka S. and Savović, Jelena and Petrović, Suzana",
year = "2022",
abstract = "In this study, the design of surface pattering with the co-existence of micrometer and nanometer features was carried out to improve the arrayed surface structures on Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayer thin films by picosecond laser processing. The novel composite structure consisted of two layers of Ti and subsurface distributed Cu and Zr layers (thickness of 10 nm) were deposited by ion sputtering on Si substrate to the total thickness of 300 nm. The changes in the composition, surface morphology, and wetting properties after laser modification was monitored by Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM–EDS), optical profilometry, and wettability measurements. It was found that laser irradiation can induce the melting of material with the formation of wrinkled periodic structures at the edges of the laser spots in both systems as a consequence of the hydrodynamic effects. Another interesting result was that the periodic structure in form of LSFL (low spatial frequency LIPSS) ripples was numerous but slightly pronounced in Ti/Cu/Zr/Ti, due to the presence of the Zr component as an ultra-thin subsurface layer, which most likely favored creating LIPSS. Such laser texturing has been used in the biomedical field as a method of developing surface topography, coated with oxides to potentially improve cell response via suitable surface wetting for a biological system.",
journal = "Optical and Quantum Electronics",
title = "Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films",
volume = "54",
number = "9",
pages = "561",
doi = "10.1007/s11082-022-03910-6"
}

Božinović, N., Rajić, V., Kisić, D., Milovanović, D. S., Savović, J.,& Petrović, S.. (2022). Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films. in Optical and Quantum Electronics, 54(9), 561.
https://doi.org/10.1007/s11082-022-03910-6

Božinović N, Rajić V, Kisić D, Milovanović DS, Savović J, Petrović S. Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films. in Optical and Quantum Electronics. 2022;54(9):561.
doi:10.1007/s11082-022-03910-6 .

Božinović, Nevena, Rajić, Vladimir, Kisić, Danilo, Milovanović, Dubravka S., Savović, Jelena, Petrović, Suzana, "Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films" in Optical and Quantum Electronics, 54, no. 9 (2022):561,
https://doi.org/10.1007/s11082-022-03910-6 . .

TY  - CONF
AU  - Kovačević, Aleksander
AU  - Petrović, Suzana
AU  - Lekić, Marina
AU  - Vasić, Borislav
AU  - Salatić, Branislav
AU  - Potočnik, Jelena
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11857
AB  - Један од ефеката интеракције ултра-кратког ласерског снопа са материјалима је формирање паралелних структура на површини (laser-induced parallel surface structures - LIPSS), чији је период мањи од таласне дужине снопа. Уколико се ради о вишеслојним танким филмовима метала, квалитет формираних структура је бољи. Узорак од пет двослојних танких филмова Al и Ti на супстрату Si смо изложили фемтосекундном снопу и запазили формирање две врсте структура које се разликују по облику. Обе су врсте вероватно узроковане појавом површинског плазмонаполаритона на површини најгорњег слоја. Појава плазмона поларитона на површини танких металних филмова и наночестица може да ограничи простирање електромагнетног поља и да појача флуоресцентни сигнал из молекула хемикалије на површини. У зависности од структуре интерфејса за одређивање циљне хемикалије на металној површини флуоресценција побољшана плазмоном (plasmon-enhanced fluorescence, PEF) је привлачан метод за скраћење времена и појачање осетљивости разних аналитичких технологија које се користе у форензици.
AB  - One of the effects of the interaction of ultrashort laser beam with materials is the forming of laser-induced parallel surface structures (LIPSS), with period less than beam wavelength. For multilayer thin metal films, the quality of formed structures is better. The sample of five bilayers of Al and Ti on Si substrate was exposed to femtosecond beam and noticed the forming of of two types of structures different in shape. Both are most probably the product of surface Plasmon polariton on the surface of most top layer. The occurrence of Plasmon polariton on the surface of thin metal layers and nanoparticles can confine the propagation of electromagnetic field and to amplify the fluorescent signal from molecules of the chemical compound on the surface. Depending on the interface structure for determining the target chemical on metal surface, Plasmon enhanced fluorescence is an attractive method for shortening the time of detection and increasing the sensitivity of various analytical technologies used in forensics.
PB  - Belgrade : ETRAN Society
PB  - Belgrade : Academic Mind
C3  - 9th International Conference IcETRAN and 66th ETRAN Conference : Proceedings ; June 6-9, 2022 ; Novi Pazar
T1  - Суб-микрометарске паралелне површинске
структуре индуковане фемтосекундним
ласерским снопом у форензици
T1  - Sub-micrometer parallel surface structures induced by femtosecond laser beam in forensics
SP  - 901
EP  - 905
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11857
ER  - 

@conference{
author = "Kovačević, Aleksander and Petrović, Suzana and Lekić, Marina and Vasić, Borislav and Salatić, Branislav and Potočnik, Jelena",
year = "2022",
abstract = "Један од ефеката интеракције ултра-кратког ласерског снопа са материјалима је формирање паралелних структура на површини (laser-induced parallel surface structures - LIPSS), чији је период мањи од таласне дужине снопа. Уколико се ради о вишеслојним танким филмовима метала, квалитет формираних структура је бољи. Узорак од пет двослојних танких филмова Al и Ti на супстрату Si смо изложили фемтосекундном снопу и запазили формирање две врсте структура које се разликују по облику. Обе су врсте вероватно узроковане појавом површинског плазмонаполаритона на површини најгорњег слоја. Појава плазмона поларитона на површини танких металних филмова и наночестица може да ограничи простирање електромагнетног поља и да појача флуоресцентни сигнал из молекула хемикалије на површини. У зависности од структуре интерфејса за одређивање циљне хемикалије на металној површини флуоресценција побољшана плазмоном (plasmon-enhanced fluorescence, PEF) је привлачан метод за скраћење времена и појачање осетљивости разних аналитичких технологија које се користе у форензици., One of the effects of the interaction of ultrashort laser beam with materials is the forming of laser-induced parallel surface structures (LIPSS), with period less than beam wavelength. For multilayer thin metal films, the quality of formed structures is better. The sample of five bilayers of Al and Ti on Si substrate was exposed to femtosecond beam and noticed the forming of of two types of structures different in shape. Both are most probably the product of surface Plasmon polariton on the surface of most top layer. The occurrence of Plasmon polariton on the surface of thin metal layers and nanoparticles can confine the propagation of electromagnetic field and to amplify the fluorescent signal from molecules of the chemical compound on the surface. Depending on the interface structure for determining the target chemical on metal surface, Plasmon enhanced fluorescence is an attractive method for shortening the time of detection and increasing the sensitivity of various analytical technologies used in forensics.",
publisher = "Belgrade : ETRAN Society, Belgrade : Academic Mind",
journal = "9th International Conference IcETRAN and 66th ETRAN Conference : Proceedings ; June 6-9, 2022 ; Novi Pazar",
title = "Суб-микрометарске паралелне површинске
структуре индуковане фемтосекундним
ласерским снопом у форензици, Sub-micrometer parallel surface structures induced by femtosecond laser beam in forensics",
pages = "901-905",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11857"
}

Kovačević, A., Petrović, S., Lekić, M., Vasić, B., Salatić, B.,& Potočnik, J.. (2022). Суб-микрометарске паралелне површинске
структуре индуковане фемтосекундним
ласерским снопом у форензици. in 9th International Conference IcETRAN and 66th ETRAN Conference : Proceedings ; June 6-9, 2022 ; Novi Pazar
Belgrade : ETRAN Society., 901-905.
https://hdl.handle.net/21.15107/rcub_vinar_11857

Kovačević A, Petrović S, Lekić M, Vasić B, Salatić B, Potočnik J. Суб-микрометарске паралелне површинске
структуре индуковане фемтосекундним
ласерским снопом у форензици. in 9th International Conference IcETRAN and 66th ETRAN Conference : Proceedings ; June 6-9, 2022 ; Novi Pazar. 2022;:901-905.
https://hdl.handle.net/21.15107/rcub_vinar_11857 .

Kovačević, Aleksander, Petrović, Suzana, Lekić, Marina, Vasić, Borislav, Salatić, Branislav, Potočnik, Jelena, "Суб-микрометарске паралелне површинске
структуре индуковане фемтосекундним
ласерским снопом у форензици" in 9th International Conference IcETRAN and 66th ETRAN Conference : Proceedings ; June 6-9, 2022 ; Novi Pazar (2022):901-905,
https://hdl.handle.net/21.15107/rcub_vinar_11857 .

TY  - JOUR
AU  - Pjević, Dejan J.
AU  - Savić, Tatjana D.
AU  - Petrović, Suzana
AU  - Peruško, Davor
AU  - Čomor, Mirjana
AU  - Kovač, Janez
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9841
AB  - The influence of deposition and annealing parameters on optical, structural and photocatalytic properties of N-doped titanium-dioxide (TiO2) thin films have been studied. Anatase and anatase-rutile crystalline phase mixture TiO2 thin films were obtained depending on the reactive direct current (DC) sputtering and annealing conditions. Deposition in the nitrogen atmosphere produced N-doped TiO2 thin films with energy gap values shifted towards visible region in comparison with thin TiO2 films deposited without nitrogen in the atmosphere. The role of substitutional and interstitial nitrogen atoms incorporated in obtained crystalline structures during the deposition was shown important and was reflected in the efficiency of photocatalysis. It was found that thin TiO2 films with more substitutional incorporated nitrogen exhibits better photocatalytic properties. These results could be of importance towards achieving controlled synthesis of N-doped TiO2 thin films with desired structural and optical properties, especially with improved photo-activity in the visible part of the solar spectrum.
T2  - ECS Journal of Solid State Science and Technology
T1  - Influence of Nitrogen Incorporation Sites on Structural and Optical Properties of Sputtered TiO2-N Thin Films with Improved Visible Light Activity
VL  - 10
IS  - 5
SP  - 053002
DO  - 10.1149/2162-8777/abffb2
ER  - 

@article{
author = "Pjević, Dejan J. and Savić, Tatjana D. and Petrović, Suzana and Peruško, Davor and Čomor, Mirjana and Kovač, Janez",
year = "2021",
abstract = "The influence of deposition and annealing parameters on optical, structural and photocatalytic properties of N-doped titanium-dioxide (TiO2) thin films have been studied. Anatase and anatase-rutile crystalline phase mixture TiO2 thin films were obtained depending on the reactive direct current (DC) sputtering and annealing conditions. Deposition in the nitrogen atmosphere produced N-doped TiO2 thin films with energy gap values shifted towards visible region in comparison with thin TiO2 films deposited without nitrogen in the atmosphere. The role of substitutional and interstitial nitrogen atoms incorporated in obtained crystalline structures during the deposition was shown important and was reflected in the efficiency of photocatalysis. It was found that thin TiO2 films with more substitutional incorporated nitrogen exhibits better photocatalytic properties. These results could be of importance towards achieving controlled synthesis of N-doped TiO2 thin films with desired structural and optical properties, especially with improved photo-activity in the visible part of the solar spectrum.",
journal = "ECS Journal of Solid State Science and Technology",
title = "Influence of Nitrogen Incorporation Sites on Structural and Optical Properties of Sputtered TiO2-N Thin Films with Improved Visible Light Activity",
volume = "10",
number = "5",
pages = "053002",
doi = "10.1149/2162-8777/abffb2"
}

Pjević, D. J., Savić, T. D., Petrović, S., Peruško, D., Čomor, M.,& Kovač, J.. (2021). Influence of Nitrogen Incorporation Sites on Structural and Optical Properties of Sputtered TiO2-N Thin Films with Improved Visible Light Activity. in ECS Journal of Solid State Science and Technology, 10(5), 053002.
https://doi.org/10.1149/2162-8777/abffb2

Pjević DJ, Savić TD, Petrović S, Peruško D, Čomor M, Kovač J. Influence of Nitrogen Incorporation Sites on Structural and Optical Properties of Sputtered TiO2-N Thin Films with Improved Visible Light Activity. in ECS Journal of Solid State Science and Technology. 2021;10(5):053002.
doi:10.1149/2162-8777/abffb2 .

Pjević, Dejan J., Savić, Tatjana D., Petrović, Suzana, Peruško, Davor, Čomor, Mirjana, Kovač, Janez, "Influence of Nitrogen Incorporation Sites on Structural and Optical Properties of Sputtered TiO2-N Thin Films with Improved Visible Light Activity" in ECS Journal of Solid State Science and Technology, 10, no. 5 (2021):053002,
https://doi.org/10.1149/2162-8777/abffb2 . .

TY  - CONF
AU  - Božinović, Nevena
AU  - Milovanović, Dubravka S.
AU  - Rajić, Vladimir
AU  - Rakočević, Lazar
AU  - Savović, Jelena
AU  - Petrović, Suzana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10913
AB  - Design of surface patterning with the co-existence of micro- and nanoscale features by picosecond laser processing is investigated in order to improve cell integration. New biomedical Ti alloys with a high concentration of β-stabilizer elements (zirconium) are developed, as potential solutions to the mismatch between the Young’s modulus of the implant and the surrounding hard tissues. On the other hand, in order to enhance the tribological and antimicrobial properties of Ti/Zr coating, a novel titanium-copper and titanium-copper-zirconium thin film systems were designed in this work. Novel composite structure composed of subsurface distributed Cu and Zr layers (thickness of 10 nm), with satisfying mechanical properties and moderate biocompatibility, were deposited by ion sputtering on Si substrate to the total thickness of 300 nm. The multilayer thin films were irradiated by focused linearly p-polarised picosecond pulses with follow characteristics: repetition rate of 10 Hz, pulse duration equal to 150 ps, central wavelength of 1064 nm and 120 µm Gaussian spot diameter. The changes of the composition and surface morphology in the Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films were monitored by X-ray photoelectron spectroscopy (XPS), by scanning electron microscopy (SEM) and by profilometry. The main part of the absorbed laser energy was rapidly transformed into heat, producing intensive modifications of composition and morphology on the multilayer surface [1,2]. The results show an increase in surface roughness, formation of a specific surface topography, appearance of hydrodynamic features and ablation of surface material. XPS analysis revealed that laser modification was induced intermixing between the Cu and Zr layers, but also with dominant Ti component. During the laser processing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films, delivered energy was sufficient to cause solid-state reactions, the formation of alloy between components. Laser processing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films is used to create the arrayed surface structure, such as laser-induced periodic surface structures (LIPSS) and at the same time to induce mixing of components inside the thin film structures, as well as the formation of ultrathin oxide layer at the laser-treated surfaces [3,4]. Laser surface patterns are organized as networks and parallel lines, where lines formed of LIPSS are wide up to 100 μm and distance between lines are less than 300 μm. The average periodicity between LIPSSs was about 900 nm, which would correspond to the formation of low spatial frequency LIPSS (LSFL).
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
T1  - Laser surface texturing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films
SP  - 153
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10913
ER  - 

@conference{
author = "Božinović, Nevena and Milovanović, Dubravka S. and Rajić, Vladimir and Rakočević, Lazar and Savović, Jelena and Petrović, Suzana",
year = "2021",
abstract = "Design of surface patterning with the co-existence of micro- and nanoscale features by picosecond laser processing is investigated in order to improve cell integration. New biomedical Ti alloys with a high concentration of β-stabilizer elements (zirconium) are developed, as potential solutions to the mismatch between the Young’s modulus of the implant and the surrounding hard tissues. On the other hand, in order to enhance the tribological and antimicrobial properties of Ti/Zr coating, a novel titanium-copper and titanium-copper-zirconium thin film systems were designed in this work. Novel composite structure composed of subsurface distributed Cu and Zr layers (thickness of 10 nm), with satisfying mechanical properties and moderate biocompatibility, were deposited by ion sputtering on Si substrate to the total thickness of 300 nm. The multilayer thin films were irradiated by focused linearly p-polarised picosecond pulses with follow characteristics: repetition rate of 10 Hz, pulse duration equal to 150 ps, central wavelength of 1064 nm and 120 µm Gaussian spot diameter. The changes of the composition and surface morphology in the Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films were monitored by X-ray photoelectron spectroscopy (XPS), by scanning electron microscopy (SEM) and by profilometry. The main part of the absorbed laser energy was rapidly transformed into heat, producing intensive modifications of composition and morphology on the multilayer surface [1,2]. The results show an increase in surface roughness, formation of a specific surface topography, appearance of hydrodynamic features and ablation of surface material. XPS analysis revealed that laser modification was induced intermixing between the Cu and Zr layers, but also with dominant Ti component. During the laser processing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films, delivered energy was sufficient to cause solid-state reactions, the formation of alloy between components. Laser processing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films is used to create the arrayed surface structure, such as laser-induced periodic surface structures (LIPSS) and at the same time to induce mixing of components inside the thin film structures, as well as the formation of ultrathin oxide layer at the laser-treated surfaces [3,4]. Laser surface patterns are organized as networks and parallel lines, where lines formed of LIPSS are wide up to 100 μm and distance between lines are less than 300 μm. The average periodicity between LIPSSs was about 900 nm, which would correspond to the formation of low spatial frequency LIPSS (LSFL).",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "Laser surface texturing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films",
pages = "153",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10913"
}

Božinović, N., Milovanović, D. S., Rajić, V., Rakočević, L., Savović, J.,& Petrović, S.. (2021). Laser surface texturing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
Belgrade : Institute of Physics Belgrade., 153.
https://hdl.handle.net/21.15107/rcub_vinar_10913

Božinović N, Milovanović DS, Rajić V, Rakočević L, Savović J, Petrović S. Laser surface texturing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade. 2021;:153.
https://hdl.handle.net/21.15107/rcub_vinar_10913 .

Božinović, Nevena, Milovanović, Dubravka S., Rajić, Vladimir, Rakočević, Lazar, Savović, Jelena, Petrović, Suzana, "Laser surface texturing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films" in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade (2021):153,
https://hdl.handle.net/21.15107/rcub_vinar_10913 .

TY  - CONF
AU  - Petrović, Suzana
AU  - Peruško, Davor
AU  - Mimidis, A.
AU  - Kavatzikidou, P.
AU  - Manousaki, A.
AU  - Božinović, Nevena
AU  - Rajić, Vladimir
AU  - Stratakis, E.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10914
AB  - The experimental study of the static and dynamic femtosecond laser ablation of the multilayer 15x(Ti/Cr)/Si system is reported. The layer-by-layer selective laser ablation mechanism was studied by analysis of the surface morphology and elemental composition in static single pulse irradiation in a range of pulse energy from 10 – 17 μJ. The selective ablations as number of concentric circles in modified spots are increased with the pulse energy. The boundary between the circles was shown a change in the depth, comparable to the thickness of the individual layers. Changes in the elemental composition at the edges are associated with the removal of the layer by layer. Due to the intermixing of components and higher content of oxygen in the central area of ablated spots, it is expected that an ultra-thin layer composed of Ti and Cr oxide phases is formed at the bottom of the ablated center. The dynamic multi-pulse irradiation was observed via the production of lines with laser-induced periodic surface structures (LIPSS) at different laser parameters (scan velocities and laser polarization). The spatial periodicity of the formed LIPSS depends on changes in the effective number of pulses and laser polarization, as well as the nature of the material. The formation of LIPSS is followed with the significant ablation of multilayer 15x(Ti/Cr)/Si system, without visible hydrodynamic features, but ripples are somewhere covered with nanoparticles dimension up to 100 nm. The main focus of this experimental study was examined a novel Ti/Cr nanolayered composite in order to create a biomimetic surface with suitable composition and structure for cell integration. Using SEM and confocal microscopy images of the laser modified surfaces with seeded cell culture (NIH 3T3 fibroblasts) was found that cell adhesion and their growth depend on the surface composition and morphological forms. These results indicated a good adhesion and proliferation of cells after two and four days, with some tendency of grouping of cells on the laser modified surfaces.
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
T1  - The surface array structures induced by femtosecond laser modifications of Ti/Cr multilayer thin films for biomedical applications
SP  - 156
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10914
ER  - 

@conference{
author = "Petrović, Suzana and Peruško, Davor and Mimidis, A. and Kavatzikidou, P. and Manousaki, A. and Božinović, Nevena and Rajić, Vladimir and Stratakis, E.",
year = "2021",
abstract = "The experimental study of the static and dynamic femtosecond laser ablation of the multilayer 15x(Ti/Cr)/Si system is reported. The layer-by-layer selective laser ablation mechanism was studied by analysis of the surface morphology and elemental composition in static single pulse irradiation in a range of pulse energy from 10 – 17 μJ. The selective ablations as number of concentric circles in modified spots are increased with the pulse energy. The boundary between the circles was shown a change in the depth, comparable to the thickness of the individual layers. Changes in the elemental composition at the edges are associated with the removal of the layer by layer. Due to the intermixing of components and higher content of oxygen in the central area of ablated spots, it is expected that an ultra-thin layer composed of Ti and Cr oxide phases is formed at the bottom of the ablated center. The dynamic multi-pulse irradiation was observed via the production of lines with laser-induced periodic surface structures (LIPSS) at different laser parameters (scan velocities and laser polarization). The spatial periodicity of the formed LIPSS depends on changes in the effective number of pulses and laser polarization, as well as the nature of the material. The formation of LIPSS is followed with the significant ablation of multilayer 15x(Ti/Cr)/Si system, without visible hydrodynamic features, but ripples are somewhere covered with nanoparticles dimension up to 100 nm. The main focus of this experimental study was examined a novel Ti/Cr nanolayered composite in order to create a biomimetic surface with suitable composition and structure for cell integration. Using SEM and confocal microscopy images of the laser modified surfaces with seeded cell culture (NIH 3T3 fibroblasts) was found that cell adhesion and their growth depend on the surface composition and morphological forms. These results indicated a good adhesion and proliferation of cells after two and four days, with some tendency of grouping of cells on the laser modified surfaces.",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "The surface array structures induced by femtosecond laser modifications of Ti/Cr multilayer thin films for biomedical applications",
pages = "156",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10914"
}

Petrović, S., Peruško, D., Mimidis, A., Kavatzikidou, P., Manousaki, A., Božinović, N., Rajić, V.,& Stratakis, E.. (2021). The surface array structures induced by femtosecond laser modifications of Ti/Cr multilayer thin films for biomedical applications. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
Belgrade : Institute of Physics Belgrade., 156.
https://hdl.handle.net/21.15107/rcub_vinar_10914

Petrović S, Peruško D, Mimidis A, Kavatzikidou P, Manousaki A, Božinović N, Rajić V, Stratakis E. The surface array structures induced by femtosecond laser modifications of Ti/Cr multilayer thin films for biomedical applications. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade. 2021;:156.
https://hdl.handle.net/21.15107/rcub_vinar_10914 .

Petrović, Suzana, Peruško, Davor, Mimidis, A., Kavatzikidou, P., Manousaki, A., Božinović, Nevena, Rajić, Vladimir, Stratakis, E., "The surface array structures induced by femtosecond laser modifications of Ti/Cr multilayer thin films for biomedical applications" in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade (2021):156,
https://hdl.handle.net/21.15107/rcub_vinar_10914 .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Tsibidis, George D.
AU  - Kovačević, Aleksander
AU  - Božinović, Nevena
AU  - Peruško, Davor
AU  - Mimidis, Alexandros
AU  - Manousaki, Alexandra
AU  - Stratakis, Emmanuel
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10079
AB  - The experimental study of the static and dynamic femtosecond laser ablation of the multilayer 15x(Ti/Zr)/Si system is reported. The layer-by-layer selective laser ablation mechanism was studied by analysis of the surface morphology and elemental composition in static single pulse irradiation in a range of pulse energy from 10 to 17 $$\upmu $$J. The selective ablations, as number of concentric circles in modified spots are increased with the pulse energy. The boundary between the circles was shown a change in the depth, comparable to the thickness of the individual layers. Changes in the elemental composition at the edges are associated with the removal of the layer by layer. The dynamic multipulse irradiation was observed via the production of lines with laser-induced periodic surface structures (LIPSS) at different laser parameters (scan velocities and laser polarization). The spatial periodicity of the formed LIPSS depends on changes in the effective number of pulses and laser polarization, as well as the nature of the material. For better interpretation of the experimental results, simulations have been conducted to explore the thermal response of the multiple layered structure 15x(Ti/Zr) after static single pulse irradiation.
T2  - European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics
T1  - Effects of static and dynamic femtosecond laser modifications of Ti/Zr multilayer thin films
VL  - 75
IS  - 12
SP  - 304
DO  - 10.1140/epjd/s10053-021-00291-5
ER  - 

@article{
author = "Petrović, Suzana and Tsibidis, George D. and Kovačević, Aleksander and Božinović, Nevena and Peruško, Davor and Mimidis, Alexandros and Manousaki, Alexandra and Stratakis, Emmanuel",
year = "2021",
abstract = "The experimental study of the static and dynamic femtosecond laser ablation of the multilayer 15x(Ti/Zr)/Si system is reported. The layer-by-layer selective laser ablation mechanism was studied by analysis of the surface morphology and elemental composition in static single pulse irradiation in a range of pulse energy from 10 to 17 $$\upmu $$J. The selective ablations, as number of concentric circles in modified spots are increased with the pulse energy. The boundary between the circles was shown a change in the depth, comparable to the thickness of the individual layers. Changes in the elemental composition at the edges are associated with the removal of the layer by layer. The dynamic multipulse irradiation was observed via the production of lines with laser-induced periodic surface structures (LIPSS) at different laser parameters (scan velocities and laser polarization). The spatial periodicity of the formed LIPSS depends on changes in the effective number of pulses and laser polarization, as well as the nature of the material. For better interpretation of the experimental results, simulations have been conducted to explore the thermal response of the multiple layered structure 15x(Ti/Zr) after static single pulse irradiation.",
journal = "European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics",
title = "Effects of static and dynamic femtosecond laser modifications of Ti/Zr multilayer thin films",
volume = "75",
number = "12",
pages = "304",
doi = "10.1140/epjd/s10053-021-00291-5"
}

Petrović, S., Tsibidis, G. D., Kovačević, A., Božinović, N., Peruško, D., Mimidis, A., Manousaki, A.,& Stratakis, E.. (2021). Effects of static and dynamic femtosecond laser modifications of Ti/Zr multilayer thin films. in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics, 75(12), 304.
https://doi.org/10.1140/epjd/s10053-021-00291-5

Petrović S, Tsibidis GD, Kovačević A, Božinović N, Peruško D, Mimidis A, Manousaki A, Stratakis E. Effects of static and dynamic femtosecond laser modifications of Ti/Zr multilayer thin films. in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics. 2021;75(12):304.
doi:10.1140/epjd/s10053-021-00291-5 .

Petrović, Suzana, Tsibidis, George D., Kovačević, Aleksander, Božinović, Nevena, Peruško, Davor, Mimidis, Alexandros, Manousaki, Alexandra, Stratakis, Emmanuel, "Effects of static and dynamic femtosecond laser modifications of Ti/Zr multilayer thin films" in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics, 75, no. 12 (2021):304,
https://doi.org/10.1140/epjd/s10053-021-00291-5 . .

TY  - CONF
AU  - Kovačević, Aleksander G.
AU  - Petrović, Suzana
AU  - Potočnik, Jelena
AU  - Lekić, Marina
AU  - Salatić, Branislav
AU  - Lazović, Vladimir
AU  - Pantelić, Dejan
AU  - Jelenković, Branislav
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11087
AB  - The interaction of ultrashort laser beam with metal surfaces may induce the generation of periodic structures (LIPSS) with period less than the incoming wavelength, opening wide area of application [1, 2]. The presence of the underneath layer influences the quality of the LIPSS [3] . We have exposed multilayer thin films Ni/Ti, Ni/Pd, W/Ti, Ti/Ta to femtosecond beams of various wavelengths and powers. The interactions have been performed by Mira900 fs laser of Coherent. Detailed surface morphology after irradiation was examined firstly by optical microscopy, and then by scanning electron microscopy (JEOL JSM-7500F, Tokyo, Japan). Two types of structures have been noticed. Their appearance differ in the direction against the polarization direction, in pronounced ablation and in the spatial period, enabling their grouping into LIPSS of higher and lower spatial frequencies. Surface plasmon polariton is seen as the most probable cause of periodic distribution of energy at the surface and consequently to LIPSS.
PB  - Belgrade : Institute of Physics
C3  - 14th Photonics Workshop : Conference : Book of abstracts; March 14-17, 2021; Kopaonik, Serbia
T1  - Laser-induced parallel structures on multilayer thin films of Ni, Pd, Ti, Ta and W
SP  - 13
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11087
ER  - 

@conference{
author = "Kovačević, Aleksander G. and Petrović, Suzana and Potočnik, Jelena and Lekić, Marina and Salatić, Branislav and Lazović, Vladimir and Pantelić, Dejan and Jelenković, Branislav",
year = "2021",
abstract = "The interaction of ultrashort laser beam with metal surfaces may induce the generation of periodic structures (LIPSS) with period less than the incoming wavelength, opening wide area of application [1, 2]. The presence of the underneath layer influences the quality of the LIPSS [3] . We have exposed multilayer thin films Ni/Ti, Ni/Pd, W/Ti, Ti/Ta to femtosecond beams of various wavelengths and powers. The interactions have been performed by Mira900 fs laser of Coherent. Detailed surface morphology after irradiation was examined firstly by optical microscopy, and then by scanning electron microscopy (JEOL JSM-7500F, Tokyo, Japan). Two types of structures have been noticed. Their appearance differ in the direction against the polarization direction, in pronounced ablation and in the spatial period, enabling their grouping into LIPSS of higher and lower spatial frequencies. Surface plasmon polariton is seen as the most probable cause of periodic distribution of energy at the surface and consequently to LIPSS.",
publisher = "Belgrade : Institute of Physics",
journal = "14th Photonics Workshop : Conference : Book of abstracts; March 14-17, 2021; Kopaonik, Serbia",
title = "Laser-induced parallel structures on multilayer thin films of Ni, Pd, Ti, Ta and W",
pages = "13",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11087"
}

Kovačević, A. G., Petrović, S., Potočnik, J., Lekić, M., Salatić, B., Lazović, V., Pantelić, D.,& Jelenković, B.. (2021). Laser-induced parallel structures on multilayer thin films of Ni, Pd, Ti, Ta and W. in 14th Photonics Workshop : Conference : Book of abstracts; March 14-17, 2021; Kopaonik, Serbia
Belgrade : Institute of Physics., 13.
https://hdl.handle.net/21.15107/rcub_vinar_11087

Kovačević AG, Petrović S, Potočnik J, Lekić M, Salatić B, Lazović V, Pantelić D, Jelenković B. Laser-induced parallel structures on multilayer thin films of Ni, Pd, Ti, Ta and W. in 14th Photonics Workshop : Conference : Book of abstracts; March 14-17, 2021; Kopaonik, Serbia. 2021;:13.
https://hdl.handle.net/21.15107/rcub_vinar_11087 .

Kovačević, Aleksander G., Petrović, Suzana, Potočnik, Jelena, Lekić, Marina, Salatić, Branislav, Lazović, Vladimir, Pantelić, Dejan, Jelenković, Branislav, "Laser-induced parallel structures on multilayer thin films of Ni, Pd, Ti, Ta and W" in 14th Photonics Workshop : Conference : Book of abstracts; March 14-17, 2021; Kopaonik, Serbia (2021):13,
https://hdl.handle.net/21.15107/rcub_vinar_11087 .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Peruško, Davor
AU  - Mimidis, Alexandros
AU  - Kavatzikidou, Paraskevi
AU  - Kovač, Janez
AU  - Ranella, Anthi
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
AU  - Stratakis, Emmanuel
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9785
AB  - Ultrafast laser processing with the formation of periodic surface nanostructures on the 15×(Ti/Zr)/Si multilayers is studied in order to the improve cell response. A novel nanocomposite structure in the form of 15x(Ti/Zr)/Si multilayer thin films, with satisfying mechanical properties and moderate biocompatibility, was deposited by ion sputtering on an Si substrate. The multilayer 15×(Ti/Zr)/Si thin films were modified by femtosecond laser pulses in air to induce the following modifications: (i) mixing of components inside of the multilayer structures, (ii) the formation of an ultrathin oxide layer at the surfaces, and (iii) surface nano-texturing with the creation of laser-induced periodic surface structure (LIPSS). The focus of this study was an examination of the novel Ti/Zr multilayer thin films in order to create a surface texture with suitable composition and structure for cell integration. Using the SEM and confocal microscopies of the laser-modified Ti/Zr surfaces with seeded cell culture (NIH 3T3 fibroblasts), it was found that cell adhesion and growth depend on the surface composition and morphological patterns. These results indicated a good proliferation of cells after two and four days with some tendency of the cell orientation along the LIPSSs. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
T2  - Nanomaterials
T1  - Response of NIH 3T3 fibroblast cells on laser-induced periodic surface structures on a 15×(Ti/Zr)/Si multilayer system
VL  - 10
IS  - 12
SP  - 1
EP  - 14
DO  - 10.3390/nano10122531
ER  - 

@article{
author = "Petrović, Suzana and Peruško, Davor and Mimidis, Alexandros and Kavatzikidou, Paraskevi and Kovač, Janez and Ranella, Anthi and Novaković, Mirjana M. and Popović, Maja and Stratakis, Emmanuel",
year = "2020",
abstract = "Ultrafast laser processing with the formation of periodic surface nanostructures on the 15×(Ti/Zr)/Si multilayers is studied in order to the improve cell response. A novel nanocomposite structure in the form of 15x(Ti/Zr)/Si multilayer thin films, with satisfying mechanical properties and moderate biocompatibility, was deposited by ion sputtering on an Si substrate. The multilayer 15×(Ti/Zr)/Si thin films were modified by femtosecond laser pulses in air to induce the following modifications: (i) mixing of components inside of the multilayer structures, (ii) the formation of an ultrathin oxide layer at the surfaces, and (iii) surface nano-texturing with the creation of laser-induced periodic surface structure (LIPSS). The focus of this study was an examination of the novel Ti/Zr multilayer thin films in order to create a surface texture with suitable composition and structure for cell integration. Using the SEM and confocal microscopies of the laser-modified Ti/Zr surfaces with seeded cell culture (NIH 3T3 fibroblasts), it was found that cell adhesion and growth depend on the surface composition and morphological patterns. These results indicated a good proliferation of cells after two and four days with some tendency of the cell orientation along the LIPSSs. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.",
journal = "Nanomaterials",
title = "Response of NIH 3T3 fibroblast cells on laser-induced periodic surface structures on a 15×(Ti/Zr)/Si multilayer system",
volume = "10",
number = "12",
pages = "1-14",
doi = "10.3390/nano10122531"
}

Petrović, S., Peruško, D., Mimidis, A., Kavatzikidou, P., Kovač, J., Ranella, A., Novaković, M. M., Popović, M.,& Stratakis, E.. (2020). Response of NIH 3T3 fibroblast cells on laser-induced periodic surface structures on a 15×(Ti/Zr)/Si multilayer system. in Nanomaterials, 10(12), 1-14.
https://doi.org/10.3390/nano10122531

Petrović S, Peruško D, Mimidis A, Kavatzikidou P, Kovač J, Ranella A, Novaković MM, Popović M, Stratakis E. Response of NIH 3T3 fibroblast cells on laser-induced periodic surface structures on a 15×(Ti/Zr)/Si multilayer system. in Nanomaterials. 2020;10(12):1-14.
doi:10.3390/nano10122531 .

Petrović, Suzana, Peruško, Davor, Mimidis, Alexandros, Kavatzikidou, Paraskevi, Kovač, Janez, Ranella, Anthi, Novaković, Mirjana M., Popović, Maja, Stratakis, Emmanuel, "Response of NIH 3T3 fibroblast cells on laser-induced periodic surface structures on a 15×(Ti/Zr)/Si multilayer system" in Nanomaterials, 10, no. 12 (2020):1-14,
https://doi.org/10.3390/nano10122531 . .

TY  - JOUR
AU  - Kovačević, Aleksander
AU  - Petrović, Suzana
AU  - Salatić, Branislav
AU  - Lekić, Marina
AU  - Vasić, Borislav Z.
AU  - Gajić, Radoš
AU  - Pantelić, Dejan
AU  - Jelenković, Branislav
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9015
AB  - The occurrence of laser-induced periodic surface structures (LIPSS) has been known for a while. Multilayer thin films, like Al/Ti, are suitable for LIPSS formation and attractive for applications—due to their wearing behavior and corrosion resistance; LIPSS generation may improve their properties as well. LIPSS properties depend not only on the material but also on the beam characteristics, like wavelength, polarization and scanning directions, etc. After exposing with NIR femtosecond pulses from Coherent Mira 900 laser system in several beam exposures, we have analyzed the samples of thin metal film systems with Tescan Mira3 SEM and NTegra AFM. The formation of LIPSS is most probably due to the generation of surface plasmon polariton, through the periodic distribution of energy in the interaction zone which lead to thermal processes in layers and interfaces. Two types of LIPSS were generated, which differ in shape, orientation and in ablation pronounced or not. For consecutive interactions in the same direction, LIPSS maintained its orientation, while for orthogonal passes LIPSS with mutually orthogonal orientation were generated. LIPSS period fluctuated between 320 and 380 nm and structures with pronounced ablation have significantly smaller width. Probable mechanism is that for greater accumulated energy pronounced ablation takes place giving LIPSS in the form of trenches or grooves, while for less accumulated energy the buildup of the material—probably due to pronounced oxidation—lead to LIPSS in the form of hills or ridges.
T2  - Optical and Quantum Electronics
T1  - Inducing LIPSS on multilayer thin metal films by femtosecond laser beam of different orientations
VL  - 52
IS  - 6
SP  - 301
DO  - 10.1007/s11082-020-02398-2
ER  - 

@article{
author = "Kovačević, Aleksander and Petrović, Suzana and Salatić, Branislav and Lekić, Marina and Vasić, Borislav Z. and Gajić, Radoš and Pantelić, Dejan and Jelenković, Branislav",
year = "2020",
abstract = "The occurrence of laser-induced periodic surface structures (LIPSS) has been known for a while. Multilayer thin films, like Al/Ti, are suitable for LIPSS formation and attractive for applications—due to their wearing behavior and corrosion resistance; LIPSS generation may improve their properties as well. LIPSS properties depend not only on the material but also on the beam characteristics, like wavelength, polarization and scanning directions, etc. After exposing with NIR femtosecond pulses from Coherent Mira 900 laser system in several beam exposures, we have analyzed the samples of thin metal film systems with Tescan Mira3 SEM and NTegra AFM. The formation of LIPSS is most probably due to the generation of surface plasmon polariton, through the periodic distribution of energy in the interaction zone which lead to thermal processes in layers and interfaces. Two types of LIPSS were generated, which differ in shape, orientation and in ablation pronounced or not. For consecutive interactions in the same direction, LIPSS maintained its orientation, while for orthogonal passes LIPSS with mutually orthogonal orientation were generated. LIPSS period fluctuated between 320 and 380 nm and structures with pronounced ablation have significantly smaller width. Probable mechanism is that for greater accumulated energy pronounced ablation takes place giving LIPSS in the form of trenches or grooves, while for less accumulated energy the buildup of the material—probably due to pronounced oxidation—lead to LIPSS in the form of hills or ridges.",
journal = "Optical and Quantum Electronics",
title = "Inducing LIPSS on multilayer thin metal films by femtosecond laser beam of different orientations",
volume = "52",
number = "6",
pages = "301",
doi = "10.1007/s11082-020-02398-2"
}

Kovačević, A., Petrović, S., Salatić, B., Lekić, M., Vasić, B. Z., Gajić, R., Pantelić, D.,& Jelenković, B.. (2020). Inducing LIPSS on multilayer thin metal films by femtosecond laser beam of different orientations. in Optical and Quantum Electronics, 52(6), 301.
https://doi.org/10.1007/s11082-020-02398-2

Kovačević A, Petrović S, Salatić B, Lekić M, Vasić BZ, Gajić R, Pantelić D, Jelenković B. Inducing LIPSS on multilayer thin metal films by femtosecond laser beam of different orientations. in Optical and Quantum Electronics. 2020;52(6):301.
doi:10.1007/s11082-020-02398-2 .

Kovačević, Aleksander, Petrović, Suzana, Salatić, Branislav, Lekić, Marina, Vasić, Borislav Z., Gajić, Radoš, Pantelić, Dejan, Jelenković, Branislav, "Inducing LIPSS on multilayer thin metal films by femtosecond laser beam of different orientations" in Optical and Quantum Electronics, 52, no. 6 (2020):301,
https://doi.org/10.1007/s11082-020-02398-2 . .

TY  - JOUR
AU  - Kovačević, Aleksander
AU  - Petrović, Suzana
AU  - Mimidis, Alexandros
AU  - Stratakis, Emmanuel
AU  - Pantelić, Dejan
AU  - Kolarić, Branko
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9632
AB  - The influence of material characteristics—i.e., type or surface texture—to wetting properties is nowadays increased by the implementation of ultrafast lasers for nanostructuring. In this account, we exposed multilayer thin metal film samples of different materials to a femtosecond laser beam at a 1030 nm wavelength. The interaction generated high-quality laser-induced periodic surface structures (LIPSS) of spatial periods between 740 and 790 nm and with maximal average corrugation height below 100 nm. The contact angle (CA) values of the water droplets on the surface were estimated and the values between unmodified and modified samples were compared. Even though the laser interaction changed both the surface morphology and the chemical composition, the wetting properties were predominantly influenced by the small change in morphology causing the increase in the contact angle of ~80%, which could not be explained classically. The influence of both surface corrugation and chemical composition to the wetting properties has been thoroughly investigated, discussed and explained. The presented results clearly confirm that femtosecond patterning can be used to mold wetting properties.
T2  - Applied Sciences
T1  - Molding Wetting by Laser-Induced Nanostructures
VL  - 10
IS  - 17
SP  - 6008
DO  - 10.3390/app10176008
ER  - 

@article{
author = "Kovačević, Aleksander and Petrović, Suzana and Mimidis, Alexandros and Stratakis, Emmanuel and Pantelić, Dejan and Kolarić, Branko",
year = "2020",
abstract = "The influence of material characteristics—i.e., type or surface texture—to wetting properties is nowadays increased by the implementation of ultrafast lasers for nanostructuring. In this account, we exposed multilayer thin metal film samples of different materials to a femtosecond laser beam at a 1030 nm wavelength. The interaction generated high-quality laser-induced periodic surface structures (LIPSS) of spatial periods between 740 and 790 nm and with maximal average corrugation height below 100 nm. The contact angle (CA) values of the water droplets on the surface were estimated and the values between unmodified and modified samples were compared. Even though the laser interaction changed both the surface morphology and the chemical composition, the wetting properties were predominantly influenced by the small change in morphology causing the increase in the contact angle of ~80%, which could not be explained classically. The influence of both surface corrugation and chemical composition to the wetting properties has been thoroughly investigated, discussed and explained. The presented results clearly confirm that femtosecond patterning can be used to mold wetting properties.",
journal = "Applied Sciences",
title = "Molding Wetting by Laser-Induced Nanostructures",
volume = "10",
number = "17",
pages = "6008",
doi = "10.3390/app10176008"
}

Kovačević, A., Petrović, S., Mimidis, A., Stratakis, E., Pantelić, D.,& Kolarić, B.. (2020). Molding Wetting by Laser-Induced Nanostructures. in Applied Sciences, 10(17), 6008.
https://doi.org/10.3390/app10176008

Kovačević A, Petrović S, Mimidis A, Stratakis E, Pantelić D, Kolarić B. Molding Wetting by Laser-Induced Nanostructures. in Applied Sciences. 2020;10(17):6008.
doi:10.3390/app10176008 .

Kovačević, Aleksander, Petrović, Suzana, Mimidis, Alexandros, Stratakis, Emmanuel, Pantelić, Dejan, Kolarić, Branko, "Molding Wetting by Laser-Induced Nanostructures" in Applied Sciences, 10, no. 17 (2020):6008,
https://doi.org/10.3390/app10176008 . .

TY  - CONF
AU  - Pjević, Dejan
AU  - Peruško, Davor
AU  - Savić, Tatjana
AU  - Novaković, Mirjana
AU  - Popović, Maja
AU  - Potočnik, Jelena
AU  - Petrović, Suzana
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11901
AB  - INTRODUCTION: Titanium dioxide (TiO2) thin films showed as promising materials for photocatalytic degradation of pollutants in water under irradiation of UV-light. It is favorable material for photocatalytic processes because of its non-toxicity, high photosensitivity, large band gap and stability. One of the way to increase efficiency of TiO2 thin films is by doping and coating with metals. Metal-doped TiO2 can reduce electron-hole recombination and increase hydroxyl radical concentration on the surface of TiO2, resulting in increase in the photocatalytic activity1. In studies of J.M.Jung at al.1 with Au-buffered TiO2 thin films and V. S. Mohite et al.2 with doped TiO2 thin films showed that this systems have enhanced photocatalytic activity in comparison to pure TiO2 thin films. Also recent study3 showed that Au doped TiO2 thin films are great candidates beside photocatalysis for enhancing visible light water splitting. EXPERIMENTAL STUDY TiO2 and TiO2:Au thin films were obtained by DC magnetron sputtering of Ti target with Ar ions in O2 atmosphere. In the case of doped TiO2 thin films with Au, three different systems were deposited for comparison (fig.1): Buffering Au layer into the TiO2 layer (b), subsurface buffering of Au with island formation of Au on the surface and etching the surface of TiO2 layer by HF and applying Au nanoparticles on the surface. Annealing of the samples was performed in air and N2 atmospheres on 600 °C for better crystallinity and release of defects. For structural analyses XRD, XPS, TEM and SEM methods were used, while for optical characterization UV/Vis method was used. The photo-degradation rate was measured using Rhodamine B which simulated pollutant. Fig. 1: Experimental setup. RESULTS AND DISCUSSION Structural analysis has shown that as deposited films have amorphous-like structures, while post-deposition thermal annealing in air for 3 hours inducted significantly better crystallinity in thin films with anatase phase dominating. SEM analysis showed the presence of 10 nm Au buffered layer in crystalline structure of TiO2 and also on the surface. Optical measurements showed shift of the absorbance edge in UV/Vis spectra toward visible light wavelengths. Presence of metal dopant in the structure probably has induced some new energy sites in the region of TiO2 energy gap. Analysis of the binding energy in the corresponding XPS spectra showed that deposited films have good stoichiometry of TiO2. At binding energies of 530 eV where O1s line is present there is broadening toward higher energies and can be attributed to surface hydroxyl group. Presence of this group on the surface of the films is favorable for photo-degradation processes. CONCLUSION Obtained TiO2 thin films after deposition were amorphous-like structured, and after annealing on 600 °C anatase phase dominates in the structure. All Au doped TiO2 thin films showed better photo-degradation rates then pure TiO2. Presence of the gold clusters on the surface of the thin film showed of significant importance. Future work will be concentrated on understanding mechanisms of different Au doping sites in TiO2 crystal structure on its photocatalytic activity.
C3  - ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts
T1  - Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11901
ER  - 

@conference{
author = "Pjević, Dejan and Peruško, Davor and Savić, Tatjana and Novaković, Mirjana and Popović, Maja and Potočnik, Jelena and Petrović, Suzana",
year = "2019",
abstract = "INTRODUCTION: Titanium dioxide (TiO2) thin films showed as promising materials for photocatalytic degradation of pollutants in water under irradiation of UV-light. It is favorable material for photocatalytic processes because of its non-toxicity, high photosensitivity, large band gap and stability. One of the way to increase efficiency of TiO2 thin films is by doping and coating with metals. Metal-doped TiO2 can reduce electron-hole recombination and increase hydroxyl radical concentration on the surface of TiO2, resulting in increase in the photocatalytic activity1. In studies of J.M.Jung at al.1 with Au-buffered TiO2 thin films and V. S. Mohite et al.2 with doped TiO2 thin films showed that this systems have enhanced photocatalytic activity in comparison to pure TiO2 thin films. Also recent study3 showed that Au doped TiO2 thin films are great candidates beside photocatalysis for enhancing visible light water splitting. EXPERIMENTAL STUDY TiO2 and TiO2:Au thin films were obtained by DC magnetron sputtering of Ti target with Ar ions in O2 atmosphere. In the case of doped TiO2 thin films with Au, three different systems were deposited for comparison (fig.1): Buffering Au layer into the TiO2 layer (b), subsurface buffering of Au with island formation of Au on the surface and etching the surface of TiO2 layer by HF and applying Au nanoparticles on the surface. Annealing of the samples was performed in air and N2 atmospheres on 600 °C for better crystallinity and release of defects. For structural analyses XRD, XPS, TEM and SEM methods were used, while for optical characterization UV/Vis method was used. The photo-degradation rate was measured using Rhodamine B which simulated pollutant. Fig. 1: Experimental setup. RESULTS AND DISCUSSION Structural analysis has shown that as deposited films have amorphous-like structures, while post-deposition thermal annealing in air for 3 hours inducted significantly better crystallinity in thin films with anatase phase dominating. SEM analysis showed the presence of 10 nm Au buffered layer in crystalline structure of TiO2 and also on the surface. Optical measurements showed shift of the absorbance edge in UV/Vis spectra toward visible light wavelengths. Presence of metal dopant in the structure probably has induced some new energy sites in the region of TiO2 energy gap. Analysis of the binding energy in the corresponding XPS spectra showed that deposited films have good stoichiometry of TiO2. At binding energies of 530 eV where O1s line is present there is broadening toward higher energies and can be attributed to surface hydroxyl group. Presence of this group on the surface of the films is favorable for photo-degradation processes. CONCLUSION Obtained TiO2 thin films after deposition were amorphous-like structured, and after annealing on 600 °C anatase phase dominates in the structure. All Au doped TiO2 thin films showed better photo-degradation rates then pure TiO2. Presence of the gold clusters on the surface of the thin film showed of significant importance. Future work will be concentrated on understanding mechanisms of different Au doping sites in TiO2 crystal structure on its photocatalytic activity.",
journal = "ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts",
title = "Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11901"
}

Pjević, D., Peruško, D., Savić, T., Novaković, M., Popović, M., Potočnik, J.,& Petrović, S.. (2019). Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering. in ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts.
https://hdl.handle.net/21.15107/rcub_vinar_11901

Pjević D, Peruško D, Savić T, Novaković M, Popović M, Potočnik J, Petrović S. Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering. in ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts. 2019;.
https://hdl.handle.net/21.15107/rcub_vinar_11901 .

Pjević, Dejan, Peruško, Davor, Savić, Tatjana, Novaković, Mirjana, Popović, Maja, Potočnik, Jelena, Petrović, Suzana, "Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering" in ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts (2019),
https://hdl.handle.net/21.15107/rcub_vinar_11901 .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Peruško, Davor
AU  - Skoulas, Evangelos
AU  - Kovač, Janez
AU  - Mitrić, Miodrag
AU  - Potočnik, Jelena
AU  - Rakočević, Zlatko Lj.
AU  - Stratakis, Emmanuel
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8816
AB  - The formation of an ordered surface texture with micro and nanometer features on Ti/Zr multilayers is studied for better understanding and improvement of cell integration. Nanocomposite in form 30×(Ti/Zr)/Si thin films was deposited by ion sputtering on Si substrate for biocompatibility investigation. Surface texturing by femtosecond laser processing made it possible to form the laser-induced periodic surface structure (LIPSS) in each laser-written line. At fluence slightly above the ablation threshold, beside the formation of low spatial frequency-LIPSS (LSFL) oriented perpendicular to the direction of the laser polarization, the laser-induced surface oxidation was achieved on the irradiated area. Intermixing between the Ti and Zr layers with the formation of alloy in the sub-surface region was attained during the laser processing. The surface of the Ti/Zr multilayer system with changed composition and topography was used to observe the effect of topography on the survival, adhesion and proliferation of the murine mesenchymal stem cells (MSCs). Confocal and SEM microscopy images showed that cell adhesion and their growth improve on these modified surfaces, with tendency of the cell orientation along of LIPSS in laser-written lines. © 2019 by the authors.
T2  - Coatings
T1  - Laser-assisted surface texturing of Ti/Zr multilayers for mesenchymal stem cell response
VL  - 9
IS  - 12
SP  - 854
DO  - 10.3390/coatings9120854
ER  - 

@article{
author = "Petrović, Suzana and Peruško, Davor and Skoulas, Evangelos and Kovač, Janez and Mitrić, Miodrag and Potočnik, Jelena and Rakočević, Zlatko Lj. and Stratakis, Emmanuel",
year = "2019",
abstract = "The formation of an ordered surface texture with micro and nanometer features on Ti/Zr multilayers is studied for better understanding and improvement of cell integration. Nanocomposite in form 30×(Ti/Zr)/Si thin films was deposited by ion sputtering on Si substrate for biocompatibility investigation. Surface texturing by femtosecond laser processing made it possible to form the laser-induced periodic surface structure (LIPSS) in each laser-written line. At fluence slightly above the ablation threshold, beside the formation of low spatial frequency-LIPSS (LSFL) oriented perpendicular to the direction of the laser polarization, the laser-induced surface oxidation was achieved on the irradiated area. Intermixing between the Ti and Zr layers with the formation of alloy in the sub-surface region was attained during the laser processing. The surface of the Ti/Zr multilayer system with changed composition and topography was used to observe the effect of topography on the survival, adhesion and proliferation of the murine mesenchymal stem cells (MSCs). Confocal and SEM microscopy images showed that cell adhesion and their growth improve on these modified surfaces, with tendency of the cell orientation along of LIPSS in laser-written lines. © 2019 by the authors.",
journal = "Coatings",
title = "Laser-assisted surface texturing of Ti/Zr multilayers for mesenchymal stem cell response",
volume = "9",
number = "12",
pages = "854",
doi = "10.3390/coatings9120854"
}

Petrović, S., Peruško, D., Skoulas, E., Kovač, J., Mitrić, M., Potočnik, J., Rakočević, Z. Lj.,& Stratakis, E.. (2019). Laser-assisted surface texturing of Ti/Zr multilayers for mesenchymal stem cell response. in Coatings, 9(12), 854.
https://doi.org/10.3390/coatings9120854

Petrović S, Peruško D, Skoulas E, Kovač J, Mitrić M, Potočnik J, Rakočević ZL, Stratakis E. Laser-assisted surface texturing of Ti/Zr multilayers for mesenchymal stem cell response. in Coatings. 2019;9(12):854.
doi:10.3390/coatings9120854 .

Petrović, Suzana, Peruško, Davor, Skoulas, Evangelos, Kovač, Janez, Mitrić, Miodrag, Potočnik, Jelena, Rakočević, Zlatko Lj., Stratakis, Emmanuel, "Laser-assisted surface texturing of Ti/Zr multilayers for mesenchymal stem cell response" in Coatings, 9, no. 12 (2019):854,
https://doi.org/10.3390/coatings9120854 . .

TY  - CONF
AU  - Kovačević, Aleksander
AU  - Petrović, Suzana
AU  - Salatić, Branislav
AU  - Lekić, Marina
AU  - Vasić, Borislav Z.
AU  - Gajić, Radoš
AU  - Pantelić, Dejan
AU  - Jelenković, Branislav
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11884
AB  - The occurrence of laser-induced periodic surface structures (LIPSS) has been known for a while [1]. Multilayer thin films, like Al/Ti, are suitable for LIPSS formation and attractive for applications – due to their wearing behavior and corrosion resistance; LIPSS generation may improve their properties as well [2, 3]. LIPSS properties depend not only on the material but also on the beam characteristics, like wavelength, polarization and scanning directions, etc. [4]. After exposing with NIR femtosecond pulses from Coherent Mira 900 laser system in several beam exposures, we have analyzed the samples of thin metal film systems with Tescan Mira3 SEM and NTegra AFM. The formation of LIPSS is most probably due to the generation of surface plasmon polariton, through the periodic distribution of energy in the interaction zone which lead to thermal processes in layers and interfaces. Two types of LIPSS were generated, which differ in shape, orientation and in ablation pronounced or not. For consecutive interactions in the same direction, LIPSS maintained its orientation, while for orthogonal passes LIPSS with mutually orthogonal orientation were generated. LIPSS period fluctuated between 320 and 380 nm and structures with pronounced ablation have significantly smaller width. Probable mechanism is that for greater accumulated energy pronounced ablation takes place giving LIPSS in the form of “trenches”, while for less accumulated energy the buildup of the material – probably due to pronounced oxidation – lead to LIPSS in the form of “hills”.
PB  - Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade
C3  - PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
T1  - Inducing LIPSS on multilayer thin metal films by femtosecond laser beam of different orientations
SP  - 160
EP  - 160
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11884
ER  - 

@conference{
author = "Kovačević, Aleksander and Petrović, Suzana and Salatić, Branislav and Lekić, Marina and Vasić, Borislav Z. and Gajić, Radoš and Pantelić, Dejan and Jelenković, Branislav",
year = "2019",
abstract = "The occurrence of laser-induced periodic surface structures (LIPSS) has been known for a while [1]. Multilayer thin films, like Al/Ti, are suitable for LIPSS formation and attractive for applications – due to their wearing behavior and corrosion resistance; LIPSS generation may improve their properties as well [2, 3]. LIPSS properties depend not only on the material but also on the beam characteristics, like wavelength, polarization and scanning directions, etc. [4]. After exposing with NIR femtosecond pulses from Coherent Mira 900 laser system in several beam exposures, we have analyzed the samples of thin metal film systems with Tescan Mira3 SEM and NTegra AFM. The formation of LIPSS is most probably due to the generation of surface plasmon polariton, through the periodic distribution of energy in the interaction zone which lead to thermal processes in layers and interfaces. Two types of LIPSS were generated, which differ in shape, orientation and in ablation pronounced or not. For consecutive interactions in the same direction, LIPSS maintained its orientation, while for orthogonal passes LIPSS with mutually orthogonal orientation were generated. LIPSS period fluctuated between 320 and 380 nm and structures with pronounced ablation have significantly smaller width. Probable mechanism is that for greater accumulated energy pronounced ablation takes place giving LIPSS in the form of “trenches”, while for less accumulated energy the buildup of the material – probably due to pronounced oxidation – lead to LIPSS in the form of “hills”.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade",
journal = "PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts",
title = "Inducing LIPSS on multilayer thin metal films by femtosecond laser beam of different orientations",
pages = "160-160",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11884"
}

Kovačević, A., Petrović, S., Salatić, B., Lekić, M., Vasić, B. Z., Gajić, R., Pantelić, D.,& Jelenković, B.. (2019). Inducing LIPSS on multilayer thin metal films by femtosecond laser beam of different orientations. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade., 160-160.
https://hdl.handle.net/21.15107/rcub_vinar_11884

Kovačević A, Petrović S, Salatić B, Lekić M, Vasić BZ, Gajić R, Pantelić D, Jelenković B. Inducing LIPSS on multilayer thin metal films by femtosecond laser beam of different orientations. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts. 2019;:160-160.
https://hdl.handle.net/21.15107/rcub_vinar_11884 .

Kovačević, Aleksander, Petrović, Suzana, Salatić, Branislav, Lekić, Marina, Vasić, Borislav Z., Gajić, Radoš, Pantelić, Dejan, Jelenković, Branislav, "Inducing LIPSS on multilayer thin metal films by femtosecond laser beam of different orientations" in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts (2019):160-160,
https://hdl.handle.net/21.15107/rcub_vinar_11884 .

TY  - CONF
AU  - Gilić, M.
AU  - Mitrić, J.
AU  - Petrović, Suzana
AU  - Peruško, Davor
AU  - Ćirković, J.
AU  - Reissig, L.
AU  - Romčević, N.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11890
AB  - We report an experimental study of Cr2O3 thin films (60, 300, 350 nm) deposited on silicon and glass substrates using the Balzers Sputtron II System. The structural and optical properties were investigated by means of AFM, XRD, UV-VIS, Raman and infrared spectroscopy, in order to determine the suitability of the as-obtained films as potential active layers in novel differential inorganic photodetectors. AFM measurements revealed that all films are well-deposited, without the presence of any cracks or voids. The crystalline peaks in the XRD spectra belonged to the trigonal Cr2O3 structure. UV-VIS measurements revealed a strong red shift in the absorption maxima with reducing film thickness. IR and Raman spectroscopy show a dependence of the characteristic vibrations on film thickness as well as on the substrate. In conclusion, our results indicate that the Cr2O3 film of 300 nm thickness is so far the most promising candidate as photoactive semiconducting layer in differential photodetectors.
PB  - Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade
C3  - PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
T1  - Optical and Structural Investigation of Cr2O3 Thin Films: the Effect of Thickness on Their Applicability in Differential Photodetectors
SP  - 105
EP  - 105
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11890
ER  - 

@conference{
author = "Gilić, M. and Mitrić, J. and Petrović, Suzana and Peruško, Davor and Ćirković, J. and Reissig, L. and Romčević, N.",
year = "2019",
abstract = "We report an experimental study of Cr2O3 thin films (60, 300, 350 nm) deposited on silicon and glass substrates using the Balzers Sputtron II System. The structural and optical properties were investigated by means of AFM, XRD, UV-VIS, Raman and infrared spectroscopy, in order to determine the suitability of the as-obtained films as potential active layers in novel differential inorganic photodetectors. AFM measurements revealed that all films are well-deposited, without the presence of any cracks or voids. The crystalline peaks in the XRD spectra belonged to the trigonal Cr2O3 structure. UV-VIS measurements revealed a strong red shift in the absorption maxima with reducing film thickness. IR and Raman spectroscopy show a dependence of the characteristic vibrations on film thickness as well as on the substrate. In conclusion, our results indicate that the Cr2O3 film of 300 nm thickness is so far the most promising candidate as photoactive semiconducting layer in differential photodetectors.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade",
journal = "PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts",
title = "Optical and Structural Investigation of Cr2O3 Thin Films: the Effect of Thickness on Their Applicability in Differential Photodetectors",
pages = "105-105",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11890"
}

Gilić, M., Mitrić, J., Petrović, S., Peruško, D., Ćirković, J., Reissig, L.,& Romčević, N.. (2019). Optical and Structural Investigation of Cr2O3 Thin Films: the Effect of Thickness on Their Applicability in Differential Photodetectors. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade., 105-105.
https://hdl.handle.net/21.15107/rcub_vinar_11890

Gilić M, Mitrić J, Petrović S, Peruško D, Ćirković J, Reissig L, Romčević N. Optical and Structural Investigation of Cr2O3 Thin Films: the Effect of Thickness on Their Applicability in Differential Photodetectors. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts. 2019;:105-105.
https://hdl.handle.net/21.15107/rcub_vinar_11890 .

Gilić, M., Mitrić, J., Petrović, Suzana, Peruško, Davor, Ćirković, J., Reissig, L., Romčević, N., "Optical and Structural Investigation of Cr2O3 Thin Films: the Effect of Thickness on Their Applicability in Differential Photodetectors" in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts (2019):105-105,
https://hdl.handle.net/21.15107/rcub_vinar_11890 .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Gaković, Biljana M.
AU  - Panjan, Peter
AU  - Kovač, Janez
AU  - Lazović, Vladimir M.
AU  - Ristoscu, Carmen
AU  - Negut, Irina
AU  - Mihailescu, Ion N.
PY  - 2018
UR  - http://link.springer.com/10.1007/s11082-018-1475-3
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7686
AB  - The oxidation behaviour and morphological modification of CrN/(Cr,V)N coatings on Si wafers were studied after UV nanosecond laser (wavelength 248 nm, pulse duration 25 ns) processing in ambient air. The evolution of the surface composition and microstructure with the number of accumulated/subsequent pulses was systematically analysed depending on the initial content of vanadium in the as-deposited coatings. Irradiation of CrN/(Cr,V)N coatings with different content of vanadium was carried out at a fluence of 0.17 J cm−2with different number of pulses. The concentration of metallic components was fairly homogeneous distributed throughout the sample. However, on surface and in sub-surface regions the contents of Cr and V are diminished due to laser-induced oxidation. The composition and thickness of forming oxides mixture, Cr2O3and V2O5, are depending on the number of applied laser pulses and the initial vanadium content. The asymmetric progress of surface morphology is characterized by the formation of grainy structures at peripheries and the appearance of cracks and irregular closed shapes in the centre of the irradiation area.
T2  - Optical and Quantum Electronics
T1  - Oxidation behaviour of composite CrN/(Cr,V)N coatings with different contents of vanadium induced by UV nanosecond laser pulses
VL  - 50
IS  - 5
SP  - 208
DO  - 10.1007/s11082-018-1475-3
ER  - 

@article{
author = "Petrović, Suzana and Gaković, Biljana M. and Panjan, Peter and Kovač, Janez and Lazović, Vladimir M. and Ristoscu, Carmen and Negut, Irina and Mihailescu, Ion N.",
year = "2018",
abstract = "The oxidation behaviour and morphological modification of CrN/(Cr,V)N coatings on Si wafers were studied after UV nanosecond laser (wavelength 248 nm, pulse duration 25 ns) processing in ambient air. The evolution of the surface composition and microstructure with the number of accumulated/subsequent pulses was systematically analysed depending on the initial content of vanadium in the as-deposited coatings. Irradiation of CrN/(Cr,V)N coatings with different content of vanadium was carried out at a fluence of 0.17 J cm−2with different number of pulses. The concentration of metallic components was fairly homogeneous distributed throughout the sample. However, on surface and in sub-surface regions the contents of Cr and V are diminished due to laser-induced oxidation. The composition and thickness of forming oxides mixture, Cr2O3and V2O5, are depending on the number of applied laser pulses and the initial vanadium content. The asymmetric progress of surface morphology is characterized by the formation of grainy structures at peripheries and the appearance of cracks and irregular closed shapes in the centre of the irradiation area.",
journal = "Optical and Quantum Electronics",
title = "Oxidation behaviour of composite CrN/(Cr,V)N coatings with different contents of vanadium induced by UV nanosecond laser pulses",
volume = "50",
number = "5",
pages = "208",
doi = "10.1007/s11082-018-1475-3"
}

Petrović, S., Gaković, B. M., Panjan, P., Kovač, J., Lazović, V. M., Ristoscu, C., Negut, I.,& Mihailescu, I. N.. (2018). Oxidation behaviour of composite CrN/(Cr,V)N coatings with different contents of vanadium induced by UV nanosecond laser pulses. in Optical and Quantum Electronics, 50(5), 208.
https://doi.org/10.1007/s11082-018-1475-3

Petrović S, Gaković BM, Panjan P, Kovač J, Lazović VM, Ristoscu C, Negut I, Mihailescu IN. Oxidation behaviour of composite CrN/(Cr,V)N coatings with different contents of vanadium induced by UV nanosecond laser pulses. in Optical and Quantum Electronics. 2018;50(5):208.
doi:10.1007/s11082-018-1475-3 .

Petrović, Suzana, Gaković, Biljana M., Panjan, Peter, Kovač, Janez, Lazović, Vladimir M., Ristoscu, Carmen, Negut, Irina, Mihailescu, Ion N., "Oxidation behaviour of composite CrN/(Cr,V)N coatings with different contents of vanadium induced by UV nanosecond laser pulses" in Optical and Quantum Electronics, 50, no. 5 (2018):208,
https://doi.org/10.1007/s11082-018-1475-3 . .

TY  - JOUR
AU  - Kudryashov, Sergey I.
AU  - Gaković, Biljana M.
AU  - Danilov, Pavel A.
AU  - Petrović, Suzana
AU  - Milovanović, Dubravka S.
AU  - Rudenko, Andrey A.
AU  - Ionin, Andrey A.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1917
AB  - Single-shot femtosecond laser ablation of Ti(Al/Ti)(5) and (Ni/Ti)(5) films on silicon substrates was studied as a function of laser fluence by means of scanning electron microscopy, energy-dispersive x-ray spectroscopy, and optical profilometry. Ablation occurs as gradual threshold-like selective removal of a few top layers at lower fluences and rather continuous removal at higher fluences, exponentially increasing versus ablated depth, with the final complete (through) ablation of the entire films. The observed selective rupture at the different internal interfaces was related to thermomechanically and chemically enhanced (interface-facilitated) explosive boiling, with the corresponding energy deposition provided by cascaded heat transfer in the poorly conducting Ti and Ni, and highly conducting Al layers and the interfacial thermal (Kapitza) resistance effect. Published by AIP Publishing.
T2  - Applied Physics Letters
T1  - Single-shot selective femtosecond laser ablation of multi-layered Ti/Al and Ni/Ti films: Cascaded heat conduction and interfacial thermal effects
VL  - 112
IS  - 2
DO  - 10.1063/1.5010793
ER  - 

@article{
author = "Kudryashov, Sergey I. and Gaković, Biljana M. and Danilov, Pavel A. and Petrović, Suzana and Milovanović, Dubravka S. and Rudenko, Andrey A. and Ionin, Andrey A.",
year = "2018",
abstract = "Single-shot femtosecond laser ablation of Ti(Al/Ti)(5) and (Ni/Ti)(5) films on silicon substrates was studied as a function of laser fluence by means of scanning electron microscopy, energy-dispersive x-ray spectroscopy, and optical profilometry. Ablation occurs as gradual threshold-like selective removal of a few top layers at lower fluences and rather continuous removal at higher fluences, exponentially increasing versus ablated depth, with the final complete (through) ablation of the entire films. The observed selective rupture at the different internal interfaces was related to thermomechanically and chemically enhanced (interface-facilitated) explosive boiling, with the corresponding energy deposition provided by cascaded heat transfer in the poorly conducting Ti and Ni, and highly conducting Al layers and the interfacial thermal (Kapitza) resistance effect. Published by AIP Publishing.",
journal = "Applied Physics Letters",
title = "Single-shot selective femtosecond laser ablation of multi-layered Ti/Al and Ni/Ti films: Cascaded heat conduction and interfacial thermal effects",
volume = "112",
number = "2",
doi = "10.1063/1.5010793"
}

Kudryashov, S. I., Gaković, B. M., Danilov, P. A., Petrović, S., Milovanović, D. S., Rudenko, A. A.,& Ionin, A. A.. (2018). Single-shot selective femtosecond laser ablation of multi-layered Ti/Al and Ni/Ti films: Cascaded heat conduction and interfacial thermal effects. in Applied Physics Letters, 112(2).
https://doi.org/10.1063/1.5010793

Kudryashov SI, Gaković BM, Danilov PA, Petrović S, Milovanović DS, Rudenko AA, Ionin AA. Single-shot selective femtosecond laser ablation of multi-layered Ti/Al and Ni/Ti films: Cascaded heat conduction and interfacial thermal effects. in Applied Physics Letters. 2018;112(2).
doi:10.1063/1.5010793 .

Kudryashov, Sergey I., Gaković, Biljana M., Danilov, Pavel A., Petrović, Suzana, Milovanović, Dubravka S., Rudenko, Andrey A., Ionin, Andrey A., "Single-shot selective femtosecond laser ablation of multi-layered Ti/Al and Ni/Ti films: Cascaded heat conduction and interfacial thermal effects" in Applied Physics Letters, 112, no. 2 (2018),
https://doi.org/10.1063/1.5010793 . .

TY  - CONF
AU  - Kovačević, A. G.
AU  - Petrović, Suzana
AU  - Lekić, M.
AU  - Jelenković, B. M.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12445
AB  - During interaction of femtosecond laser beam with metal surfaces, laser induced pe- riodic nanostructures, LIPSS can be formed, which may improve properties of materials. Having excellent mechanical properties, multilayer thin films, like 5x(Al/Ti)@Si, are con- venient for forming of high quality LIPSS [1] due to their multilayer structure. We have exposed the multilayer thin film metal systems 5x(Al/Ti)@Si with femtosecond beam from the laser system Coherent Mira 900 in NIR with various scanning configurations [2]. The irradiated samples have been analyzed by Tescan Mira3 SEM. The beam scanned over the surface of the samples with multi-pass and cross-directional scanning configurations with the change of polarization direction. The formation of LIPSS is most probably due to the occurence of surface plasmon polariton, which leads to the periodic distribution of energy on the sample surface. The orientation of the LIPSS is related to the direction of the beam polarization. During multi-pass scanning, LIPSS maintained its configuration. The preservation of structures occured to some extent. Depending on the accumulated energy, two forms of LIPSS were generated: “hills”, for less accumulation, and “trenches” for greater accumulation. “Hills” are non-ablative, probably are due to the build-up of the material and are parallel to the polarization direction. “Trenches” are formed by ablation and are perpendicular to the polarization direction. During cross-directional scanning, LIPSS of orthogonal directions have been generated. The value of the “hills” period was around 360 nm and the width was ∼285 nm. The values of “trenches” period fluctuated between 320 and 380 nm, while width was between 85 and 45 nm. Proposed mechanism is that, for less accumulated energy, “hills” formed, while more accumulated energy leads to the ablation and formation of “trenches”.
PB  - Moscow : Lebedev Physical Institute
C3  - UltrafastLight-2018 : International Conference on Ultrafast Optical Science : Book of Abstracts
T1  - Inducing LIPSS by multi-pass and cross-directional scanning of femtosecond beam over surface of thin metal films
SP  - 108
EP  - 108
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12445
ER  - 

@conference{
author = "Kovačević, A. G. and Petrović, Suzana and Lekić, M. and Jelenković, B. M.",
year = "2018",
abstract = "During interaction of femtosecond laser beam with metal surfaces, laser induced pe- riodic nanostructures, LIPSS can be formed, which may improve properties of materials. Having excellent mechanical properties, multilayer thin films, like 5x(Al/Ti)@Si, are con- venient for forming of high quality LIPSS [1] due to their multilayer structure. We have exposed the multilayer thin film metal systems 5x(Al/Ti)@Si with femtosecond beam from the laser system Coherent Mira 900 in NIR with various scanning configurations [2]. The irradiated samples have been analyzed by Tescan Mira3 SEM. The beam scanned over the surface of the samples with multi-pass and cross-directional scanning configurations with the change of polarization direction. The formation of LIPSS is most probably due to the occurence of surface plasmon polariton, which leads to the periodic distribution of energy on the sample surface. The orientation of the LIPSS is related to the direction of the beam polarization. During multi-pass scanning, LIPSS maintained its configuration. The preservation of structures occured to some extent. Depending on the accumulated energy, two forms of LIPSS were generated: “hills”, for less accumulation, and “trenches” for greater accumulation. “Hills” are non-ablative, probably are due to the build-up of the material and are parallel to the polarization direction. “Trenches” are formed by ablation and are perpendicular to the polarization direction. During cross-directional scanning, LIPSS of orthogonal directions have been generated. The value of the “hills” period was around 360 nm and the width was ∼285 nm. The values of “trenches” period fluctuated between 320 and 380 nm, while width was between 85 and 45 nm. Proposed mechanism is that, for less accumulated energy, “hills” formed, while more accumulated energy leads to the ablation and formation of “trenches”.",
publisher = "Moscow : Lebedev Physical Institute",
journal = "UltrafastLight-2018 : International Conference on Ultrafast Optical Science : Book of Abstracts",
title = "Inducing LIPSS by multi-pass and cross-directional scanning of femtosecond beam over surface of thin metal films",
pages = "108-108",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12445"
}

Kovačević, A. G., Petrović, S., Lekić, M.,& Jelenković, B. M.. (2018). Inducing LIPSS by multi-pass and cross-directional scanning of femtosecond beam over surface of thin metal films. in UltrafastLight-2018 : International Conference on Ultrafast Optical Science : Book of Abstracts
Moscow : Lebedev Physical Institute., 108-108.
https://hdl.handle.net/21.15107/rcub_vinar_12445

Kovačević AG, Petrović S, Lekić M, Jelenković BM. Inducing LIPSS by multi-pass and cross-directional scanning of femtosecond beam over surface of thin metal films. in UltrafastLight-2018 : International Conference on Ultrafast Optical Science : Book of Abstracts. 2018;:108-108.
https://hdl.handle.net/21.15107/rcub_vinar_12445 .

Kovačević, A. G., Petrović, Suzana, Lekić, M., Jelenković, B. M., "Inducing LIPSS by multi-pass and cross-directional scanning of femtosecond beam over surface of thin metal films" in UltrafastLight-2018 : International Conference on Ultrafast Optical Science : Book of Abstracts (2018):108-108,
https://hdl.handle.net/21.15107/rcub_vinar_12445 .

TY  - JOUR
AU  - Obradović, Marko O.
AU  - Kovač, Janez
AU  - Petrović, Suzana
AU  - Lazović, Vladimir M.
AU  - Salatić, Branislav
AU  - Ciganović, Jovan
AU  - Pjević, Dejan J.
AU  - Milosavljević, Momir
AU  - Peruško, Davor
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7721
AB  - The possibility of interlayer mixing in a Ti/Ta multilayer system, induced by laser irradiation, was the main purpose of these experiments. Ti/Ta multilayer system, consisting of ten alternating Ti and Ta thin films and covered by slightly thicker Ti layer, was deposited on Si (100) wafers to a total thickness of 205 nm. Laser irradiation was performed in air by picoseconds Nd:YAG laser pulses in defocused regime with fluences of 0.057 and 0.11 J cm−2. Laser beam was scanned over the 5 × 5 mm surface area with different steps along y-axes. Structural and compositional characterisation was done by auger electron spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, and scanning electron microscopy. Laser processing at lower fluence caused only oxidation of the top Ti layer, despite of the number of applied laser pulses. Interlayer mixing was not observed. Application of laser pulses at fluence of 0.11 J cm−2caused partial and/or complete ablation of deposited layers. In partially ablated regions considerable mixing between Ti and Ta films was registered.
T2  - Optical and Quantum Electronics
T1  - Laser induced mixing in multilayered Ti/Ta thin film structures
VL  - 50
IS  - 6
SP  - 257
DO  - 10.1007/s11082-018-1525-x
ER  - 

@article{
author = "Obradović, Marko O. and Kovač, Janez and Petrović, Suzana and Lazović, Vladimir M. and Salatić, Branislav and Ciganović, Jovan and Pjević, Dejan J. and Milosavljević, Momir and Peruško, Davor",
year = "2018",
abstract = "The possibility of interlayer mixing in a Ti/Ta multilayer system, induced by laser irradiation, was the main purpose of these experiments. Ti/Ta multilayer system, consisting of ten alternating Ti and Ta thin films and covered by slightly thicker Ti layer, was deposited on Si (100) wafers to a total thickness of 205 nm. Laser irradiation was performed in air by picoseconds Nd:YAG laser pulses in defocused regime with fluences of 0.057 and 0.11 J cm−2. Laser beam was scanned over the 5 × 5 mm surface area with different steps along y-axes. Structural and compositional characterisation was done by auger electron spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, and scanning electron microscopy. Laser processing at lower fluence caused only oxidation of the top Ti layer, despite of the number of applied laser pulses. Interlayer mixing was not observed. Application of laser pulses at fluence of 0.11 J cm−2caused partial and/or complete ablation of deposited layers. In partially ablated regions considerable mixing between Ti and Ta films was registered.",
journal = "Optical and Quantum Electronics",
title = "Laser induced mixing in multilayered Ti/Ta thin film structures",
volume = "50",
number = "6",
pages = "257",
doi = "10.1007/s11082-018-1525-x"
}

Obradović, M. O., Kovač, J., Petrović, S., Lazović, V. M., Salatić, B., Ciganović, J., Pjević, D. J., Milosavljević, M.,& Peruško, D.. (2018). Laser induced mixing in multilayered Ti/Ta thin film structures. in Optical and Quantum Electronics, 50(6), 257.
https://doi.org/10.1007/s11082-018-1525-x

Obradović MO, Kovač J, Petrović S, Lazović VM, Salatić B, Ciganović J, Pjević DJ, Milosavljević M, Peruško D. Laser induced mixing in multilayered Ti/Ta thin film structures. in Optical and Quantum Electronics. 2018;50(6):257.
doi:10.1007/s11082-018-1525-x .

Obradović, Marko O., Kovač, Janez, Petrović, Suzana, Lazović, Vladimir M., Salatić, Branislav, Ciganović, Jovan, Pjević, Dejan J., Milosavljević, Momir, Peruško, Davor, "Laser induced mixing in multilayered Ti/Ta thin film structures" in Optical and Quantum Electronics, 50, no. 6 (2018):257,
https://doi.org/10.1007/s11082-018-1525-x . .

TY  - CONF
AU  - Kovačević, Aleksander G.
AU  - Petrović, Suzana
AU  - Lekić, Marina
AU  - Peruško, Davor
AU  - Lazović, Vladimir
AU  - Savić-Šević, Svetlana
AU  - Vasić, Borislav
AU  - Salatić, Branislav
AU  - Gajić, Radoš
AU  - Pantelić, Dejan
AU  - Jelenković, Branislav
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12275
PB  - Belgrade : Institute of physics
C3  - 11th Workshop on PHOTONICS : Book of abstracts
T1  - Formation of LIPSS on Al/Ti thin metal films by scanning of low-fluence femtosecond beam during cross-directional scanning
SP  - 34
EP  - 34
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12275
ER  - 

@conference{
author = "Kovačević, Aleksander G. and Petrović, Suzana and Lekić, Marina and Peruško, Davor and Lazović, Vladimir and Savić-Šević, Svetlana and Vasić, Borislav and Salatić, Branislav and Gajić, Radoš and Pantelić, Dejan and Jelenković, Branislav",
year = "2018",
publisher = "Belgrade : Institute of physics",
journal = "11th Workshop on PHOTONICS : Book of abstracts",
title = "Formation of LIPSS on Al/Ti thin metal films by scanning of low-fluence femtosecond beam during cross-directional scanning",
pages = "34-34",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12275"
}

Kovačević, A. G., Petrović, S., Lekić, M., Peruško, D., Lazović, V., Savić-Šević, S., Vasić, B., Salatić, B., Gajić, R., Pantelić, D.,& Jelenković, B.. (2018). Formation of LIPSS on Al/Ti thin metal films by scanning of low-fluence femtosecond beam during cross-directional scanning. in 11th Workshop on PHOTONICS : Book of abstracts
Belgrade : Institute of physics., 34-34.
https://hdl.handle.net/21.15107/rcub_vinar_12275

Kovačević AG, Petrović S, Lekić M, Peruško D, Lazović V, Savić-Šević S, Vasić B, Salatić B, Gajić R, Pantelić D, Jelenković B. Formation of LIPSS on Al/Ti thin metal films by scanning of low-fluence femtosecond beam during cross-directional scanning. in 11th Workshop on PHOTONICS : Book of abstracts. 2018;:34-34.
https://hdl.handle.net/21.15107/rcub_vinar_12275 .

Kovačević, Aleksander G., Petrović, Suzana, Lekić, Marina, Peruško, Davor, Lazović, Vladimir, Savić-Šević, Svetlana, Vasić, Borislav, Salatić, Branislav, Gajić, Radoš, Pantelić, Dejan, Jelenković, Branislav, "Formation of LIPSS on Al/Ti thin metal films by scanning of low-fluence femtosecond beam during cross-directional scanning" in 11th Workshop on PHOTONICS : Book of abstracts (2018):34-34,
https://hdl.handle.net/21.15107/rcub_vinar_12275 .

TY  - CONF
AU  - Kovačević, Aleksander G.
AU  - Petrović, Suzana
AU  - Lekić, Marina
AU  - Peruško, Davor
AU  - Lazović, Vladimir
AU  - Savić-Šević, Svetlana
AU  - Vasić, Borislav
AU  - Salatić, Branislav
AU  - Gajić, Radoš
AU  - Pantelić, Dejan
AU  - Jelenković, Branislav
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12276
PB  - Belgrade : Institute of physics
C3  - 11th Workshop on PHOTONICS : Book of abstracts
T1  - Formation of LIPSS on Al/Ti thin metal films by scanning of low-fluence femtosecond beam during multi-pass scanning
SP  - 35
EP  - 35
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12276
ER  - 

@conference{
author = "Kovačević, Aleksander G. and Petrović, Suzana and Lekić, Marina and Peruško, Davor and Lazović, Vladimir and Savić-Šević, Svetlana and Vasić, Borislav and Salatić, Branislav and Gajić, Radoš and Pantelić, Dejan and Jelenković, Branislav",
year = "2018",
publisher = "Belgrade : Institute of physics",
journal = "11th Workshop on PHOTONICS : Book of abstracts",
title = "Formation of LIPSS on Al/Ti thin metal films by scanning of low-fluence femtosecond beam during multi-pass scanning",
pages = "35-35",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12276"
}

Kovačević, A. G., Petrović, S., Lekić, M., Peruško, D., Lazović, V., Savić-Šević, S., Vasić, B., Salatić, B., Gajić, R., Pantelić, D.,& Jelenković, B.. (2018). Formation of LIPSS on Al/Ti thin metal films by scanning of low-fluence femtosecond beam during multi-pass scanning. in 11th Workshop on PHOTONICS : Book of abstracts
Belgrade : Institute of physics., 35-35.
https://hdl.handle.net/21.15107/rcub_vinar_12276

Kovačević AG, Petrović S, Lekić M, Peruško D, Lazović V, Savić-Šević S, Vasić B, Salatić B, Gajić R, Pantelić D, Jelenković B. Formation of LIPSS on Al/Ti thin metal films by scanning of low-fluence femtosecond beam during multi-pass scanning. in 11th Workshop on PHOTONICS : Book of abstracts. 2018;:35-35.
https://hdl.handle.net/21.15107/rcub_vinar_12276 .

Kovačević, Aleksander G., Petrović, Suzana, Lekić, Marina, Peruško, Davor, Lazović, Vladimir, Savić-Šević, Svetlana, Vasić, Borislav, Salatić, Branislav, Gajić, Radoš, Pantelić, Dejan, Jelenković, Branislav, "Formation of LIPSS on Al/Ti thin metal films by scanning of low-fluence femtosecond beam during multi-pass scanning" in 11th Workshop on PHOTONICS : Book of abstracts (2018):35-35,
https://hdl.handle.net/21.15107/rcub_vinar_12276 .

TY  - CONF
AU  - Kovačević, Aleksander
AU  - Petrović, Suzana
AU  - Peruško, Davor
AU  - Lazović, Vladimir
AU  - Bogdanović-Radović, Iva
AU  - Pavlović, Vladimir B.
AU  - Pantelić, Dejan
AU  - Jelenković, Branislav
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10947
AB  - Nanostructuring of surfaces by femtosecond (fs) laser beam interaction is the topic of research for some time [1]. The emergence of the laser-induced periodic surface structures (LIPSS) on metal-dielectric surfaces is of interest from fundamental and application points of view. The interaction of fs beam with thin films can also generate LIPSS, with the arrangement of thin films in multi-layer structure being important for the quality of the LIPSS [2]. Excellent properties of titanium (Ti) and tantalum (Ta), like corrosion resistance, heat transfer properties and workability, recommend them as useful materials for a wide range of applications - heat exchangers, reactors, and others exposed to extremely corrosive fluids. Combining Ti and Ta could be attractive for applications, but challenging, as they have great difference in melting point and density, therefore, TiTa alloys are still not widely adopted in applications [3]. We have performed the interaction of fs laser beam with multilayer Ti/Ta samples in order to investigate the effects of interaction with ultra-short pulses to surface morphology and to both surface and bulk chemistry of newly generated compounds. Each layer of the sample was 17 nm thick. The interactions were in two regimes: dynamic and static, depending whether the beam scanned over the sample surface or not. SEM and PIXE RBS analyses have shown the LIPSS formed with or without ablation depending on the beam fluence. The LIPSS orientation is dependent on the input beam polarization. Both types of LIPSS were formed, low- and highspatial frequency LIPSS, with periods being as low as 120 nm.
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2017 : 6th International School and Conference on Photonics and COST actions: MP1406 and MP1402 : Program and the book of abstracts
T1  - Inducing periodic structures on multilayers of Ti and Ta by femtosecond laser beam
SP  - 179
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10947
ER  - 

@conference{
author = "Kovačević, Aleksander and Petrović, Suzana and Peruško, Davor and Lazović, Vladimir and Bogdanović-Radović, Iva and Pavlović, Vladimir B. and Pantelić, Dejan and Jelenković, Branislav",
year = "2017",
abstract = "Nanostructuring of surfaces by femtosecond (fs) laser beam interaction is the topic of research for some time [1]. The emergence of the laser-induced periodic surface structures (LIPSS) on metal-dielectric surfaces is of interest from fundamental and application points of view. The interaction of fs beam with thin films can also generate LIPSS, with the arrangement of thin films in multi-layer structure being important for the quality of the LIPSS [2]. Excellent properties of titanium (Ti) and tantalum (Ta), like corrosion resistance, heat transfer properties and workability, recommend them as useful materials for a wide range of applications - heat exchangers, reactors, and others exposed to extremely corrosive fluids. Combining Ti and Ta could be attractive for applications, but challenging, as they have great difference in melting point and density, therefore, TiTa alloys are still not widely adopted in applications [3]. We have performed the interaction of fs laser beam with multilayer Ti/Ta samples in order to investigate the effects of interaction with ultra-short pulses to surface morphology and to both surface and bulk chemistry of newly generated compounds. Each layer of the sample was 17 nm thick. The interactions were in two regimes: dynamic and static, depending whether the beam scanned over the sample surface or not. SEM and PIXE RBS analyses have shown the LIPSS formed with or without ablation depending on the beam fluence. The LIPSS orientation is dependent on the input beam polarization. Both types of LIPSS were formed, low- and highspatial frequency LIPSS, with periods being as low as 120 nm.",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2017 : 6th International School and Conference on Photonics and COST actions: MP1406 and MP1402 : Program and the book of abstracts",
title = "Inducing periodic structures on multilayers of Ti and Ta by femtosecond laser beam",
pages = "179",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10947"
}

Kovačević, A., Petrović, S., Peruško, D., Lazović, V., Bogdanović-Radović, I., Pavlović, V. B., Pantelić, D.,& Jelenković, B.. (2017). Inducing periodic structures on multilayers of Ti and Ta by femtosecond laser beam. in PHOTONICA2017 : 6th International School and Conference on Photonics and COST actions: MP1406 and MP1402 : Program and the book of abstracts
Belgrade : Institute of Physics Belgrade., 179.
https://hdl.handle.net/21.15107/rcub_vinar_10947

Kovačević A, Petrović S, Peruško D, Lazović V, Bogdanović-Radović I, Pavlović VB, Pantelić D, Jelenković B. Inducing periodic structures on multilayers of Ti and Ta by femtosecond laser beam. in PHOTONICA2017 : 6th International School and Conference on Photonics and COST actions: MP1406 and MP1402 : Program and the book of abstracts. 2017;:179.
https://hdl.handle.net/21.15107/rcub_vinar_10947 .

Kovačević, Aleksander, Petrović, Suzana, Peruško, Davor, Lazović, Vladimir, Bogdanović-Radović, Iva, Pavlović, Vladimir B., Pantelić, Dejan, Jelenković, Branislav, "Inducing periodic structures on multilayers of Ti and Ta by femtosecond laser beam" in PHOTONICA2017 : 6th International School and Conference on Photonics and COST actions: MP1406 and MP1402 : Program and the book of abstracts (2017):179,
https://hdl.handle.net/21.15107/rcub_vinar_10947 .