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  - 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  - 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  - 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  - JOUR
AU  - Gaković, Biljana M.
AU  - Tsibidis, George D.
AU  - Skoulas, Evangelos
AU  - Petrović, Suzana
AU  - Vasić, Borislav Z.
AU  - Stratakis, Emmanuel
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1880
AB  - The interaction of ultra-short laser pulses with Titanium/Aluminium (Ti/Al) nano-layered thin film was investigated. The sample composed of alternating Ti and Al layers of a few nanometres thick was deposited by ion-sputtering. A single pulse irradiation experiment was conducted in an ambient air environment using focused and linearly polarized femtosecond laser pulses for the investigation of the ablation effects. The laser induced morphological changes and the composition were characterized using several microscopy techniques and energy dispersive X-ray spectroscopy. The following results were obtained: (i) at low values of pulse energy/fluence, ablation of the upper Ti layer only was observed; (ii) at higher laser fluence, a two-step ablation of Ti and Al layers takes place, followed by partial removal of the nano-layered film. The experimental observations were supported by a theoretical model accounting for the thermal response of the multiple layered structure upon irradiation with ultra-short laser pulses. Published by AIP Publishing.
T2  - Journal of Applied Physics
T1  - Partial ablation of Ti/Al nano-layer thin film by single femtosecond laser pulse
VL  - 122
IS  - 22
DO  - 10.1063/1.5016548
ER  - 

@article{
author = "Gaković, Biljana M. and Tsibidis, George D. and Skoulas, Evangelos and Petrović, Suzana and Vasić, Borislav Z. and Stratakis, Emmanuel",
year = "2017",
abstract = "The interaction of ultra-short laser pulses with Titanium/Aluminium (Ti/Al) nano-layered thin film was investigated. The sample composed of alternating Ti and Al layers of a few nanometres thick was deposited by ion-sputtering. A single pulse irradiation experiment was conducted in an ambient air environment using focused and linearly polarized femtosecond laser pulses for the investigation of the ablation effects. The laser induced morphological changes and the composition were characterized using several microscopy techniques and energy dispersive X-ray spectroscopy. The following results were obtained: (i) at low values of pulse energy/fluence, ablation of the upper Ti layer only was observed; (ii) at higher laser fluence, a two-step ablation of Ti and Al layers takes place, followed by partial removal of the nano-layered film. The experimental observations were supported by a theoretical model accounting for the thermal response of the multiple layered structure upon irradiation with ultra-short laser pulses. Published by AIP Publishing.",
journal = "Journal of Applied Physics",
title = "Partial ablation of Ti/Al nano-layer thin film by single femtosecond laser pulse",
volume = "122",
number = "22",
doi = "10.1063/1.5016548"
}

Gaković, B. M., Tsibidis, G. D., Skoulas, E., Petrović, S., Vasić, B. Z.,& Stratakis, E.. (2017). Partial ablation of Ti/Al nano-layer thin film by single femtosecond laser pulse. in Journal of Applied Physics, 122(22).
https://doi.org/10.1063/1.5016548

Gaković BM, Tsibidis GD, Skoulas E, Petrović S, Vasić BZ, Stratakis E. Partial ablation of Ti/Al nano-layer thin film by single femtosecond laser pulse. in Journal of Applied Physics. 2017;122(22).
doi:10.1063/1.5016548 .

Gaković, Biljana M., Tsibidis, George D., Skoulas, Evangelos, Petrović, Suzana, Vasić, Borislav Z., Stratakis, Emmanuel, "Partial ablation of Ti/Al nano-layer thin film by single femtosecond laser pulse" in Journal of Applied Physics, 122, no. 22 (2017),
https://doi.org/10.1063/1.5016548 . .