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  - 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  - 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  - Ralević, Uroš
AU  - Isić, Goran
AU  - Laban, Bojana
AU  - Vodnik, Vesna
AU  - Vasić, Vesna
AU  - Gajić, Radoš
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12006
AB  - Dye-coated colloidal metal nanoparticles (NPs) exhibit interesting optical properties originating from the interaction between metal core and dye shell. Depending on the interaction mechanism between the two, optical properties of dyes or NPs can be changed separately or jointly within the dye-NP assembly [1]. Many of the recent studies are focused on dyes which are able to self-assemble in highly oriented structures called Jaggregates on the surface of metallic NPs [2,3]. Owing to the variety of mechanisms by which dyes and their J-aggregates can interact with metallic NPs, dye-NP assemblies can lead to applications ranging from nanoscale sensing [4] to advanced composite materials for novel active and nonlinear optical devices [5]. Here we study the influence of TC concentration on its J-aggregation on the surface of AgNPs assemblies using Raman mapping and atomic force microscopy (AFM). Aqueous solutions (colloids) of citrate stabilized AgNPs with an average diameter of ~10 nm are mixed with TC dye solution and then deposited onto freshly cleaved highly oriented pyrolytic graphite and mica surfaces. The spectral signature of citrate ions is identified by (i) the O-H band around 220 cm-1, (ii) the C-H band around 2950 cm-1 and (iii) pronounced blinking in the 1000-1800 cm-1 range. In contrast, dye molecules adsorbed on nanoparticles are recognized by several stable Raman bands between 200 and 1600 cm-1. In situ AFM measurements show that SERS 'hot spots' are formed either on large single nanoparticles (diameter > 100 nm) or within assemblies of small nanoparticles (with diameters in the 10 - 50 nm range). However, only the latter are found to yield a citrate or TC dye SERS signal. We find that the TC dye adsorbed on the surface of AgNP nanoassemblies always forms J-aggregates when the dye concentration in the TC-AgNP solution is varied between 0.5μM and 17μM. Even though, a clear SERS spectra of dye Jaggregates can be acquired for high dye concentration (17μM) the citrate ions always exist on the AgNP surface and so does their SERS signature in form of O-H (220 cm-1) and C-H (2960 cm-1) bands. Assemblies with low TC concentration (0.5μM) do not have a clear dye SERS spectra, but rather spectra similar to the one of citrate ions meaning that either not all AgNPs are dye coated, or rather that the amount of TC molecules adsorbed on the surface of the nanoparticle is small and hence not detectable. We are grateful to the Serbian Ministry of Education, Science and Technological Development for financial support through projects Nos. OI 171005, OI 172023. This work was performed in the context of the European COST Action MP1302 Nanospectroscopy.
PB  - Belgrade : Vinča Institute of Nuclear Sciences
C3  - PHOTONICA2015 : 5th International School and Conference on Photonics and COST actions: MP1204, BM1205 and MP1205 : book of abstracts; August 24-28, 2015; Belgrade
T1  - Surface enhanced Raman spectroscopy of thiacyanine dye J-aggregates on single silver nanoaggregates
SP  - 97
EP  - 98
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12006
ER  - 

@conference{
author = "Ralević, Uroš and Isić, Goran and Laban, Bojana and Vodnik, Vesna and Vasić, Vesna and Gajić, Radoš",
year = "2015",
abstract = "Dye-coated colloidal metal nanoparticles (NPs) exhibit interesting optical properties originating from the interaction between metal core and dye shell. Depending on the interaction mechanism between the two, optical properties of dyes or NPs can be changed separately or jointly within the dye-NP assembly [1]. Many of the recent studies are focused on dyes which are able to self-assemble in highly oriented structures called Jaggregates on the surface of metallic NPs [2,3]. Owing to the variety of mechanisms by which dyes and their J-aggregates can interact with metallic NPs, dye-NP assemblies can lead to applications ranging from nanoscale sensing [4] to advanced composite materials for novel active and nonlinear optical devices [5]. Here we study the influence of TC concentration on its J-aggregation on the surface of AgNPs assemblies using Raman mapping and atomic force microscopy (AFM). Aqueous solutions (colloids) of citrate stabilized AgNPs with an average diameter of ~10 nm are mixed with TC dye solution and then deposited onto freshly cleaved highly oriented pyrolytic graphite and mica surfaces. The spectral signature of citrate ions is identified by (i) the O-H band around 220 cm-1, (ii) the C-H band around 2950 cm-1 and (iii) pronounced blinking in the 1000-1800 cm-1 range. In contrast, dye molecules adsorbed on nanoparticles are recognized by several stable Raman bands between 200 and 1600 cm-1. In situ AFM measurements show that SERS 'hot spots' are formed either on large single nanoparticles (diameter > 100 nm) or within assemblies of small nanoparticles (with diameters in the 10 - 50 nm range). However, only the latter are found to yield a citrate or TC dye SERS signal. We find that the TC dye adsorbed on the surface of AgNP nanoassemblies always forms J-aggregates when the dye concentration in the TC-AgNP solution is varied between 0.5μM and 17μM. Even though, a clear SERS spectra of dye Jaggregates can be acquired for high dye concentration (17μM) the citrate ions always exist on the AgNP surface and so does their SERS signature in form of O-H (220 cm-1) and C-H (2960 cm-1) bands. Assemblies with low TC concentration (0.5μM) do not have a clear dye SERS spectra, but rather spectra similar to the one of citrate ions meaning that either not all AgNPs are dye coated, or rather that the amount of TC molecules adsorbed on the surface of the nanoparticle is small and hence not detectable. We are grateful to the Serbian Ministry of Education, Science and Technological Development for financial support through projects Nos. OI 171005, OI 172023. This work was performed in the context of the European COST Action MP1302 Nanospectroscopy.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2015 : 5th International School and Conference on Photonics and COST actions: MP1204, BM1205 and MP1205 : book of abstracts; August 24-28, 2015; Belgrade",
title = "Surface enhanced Raman spectroscopy of thiacyanine dye J-aggregates on single silver nanoaggregates",
pages = "97-98",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12006"
}

Ralević, U., Isić, G., Laban, B., Vodnik, V., Vasić, V.,& Gajić, R.. (2015). Surface enhanced Raman spectroscopy of thiacyanine dye J-aggregates on single silver nanoaggregates. in PHOTONICA2015 : 5th International School and Conference on Photonics and COST actions: MP1204, BM1205 and MP1205 : book of abstracts; August 24-28, 2015; Belgrade
Belgrade : Vinča Institute of Nuclear Sciences., 97-98.
https://hdl.handle.net/21.15107/rcub_vinar_12006

Ralević U, Isić G, Laban B, Vodnik V, Vasić V, Gajić R. Surface enhanced Raman spectroscopy of thiacyanine dye J-aggregates on single silver nanoaggregates. in PHOTONICA2015 : 5th International School and Conference on Photonics and COST actions: MP1204, BM1205 and MP1205 : book of abstracts; August 24-28, 2015; Belgrade. 2015;:97-98.
https://hdl.handle.net/21.15107/rcub_vinar_12006 .

Ralević, Uroš, Isić, Goran, Laban, Bojana, Vodnik, Vesna, Vasić, Vesna, Gajić, Radoš, "Surface enhanced Raman spectroscopy of thiacyanine dye J-aggregates on single silver nanoaggregates" in PHOTONICA2015 : 5th International School and Conference on Photonics and COST actions: MP1204, BM1205 and MP1205 : book of abstracts; August 24-28, 2015; Belgrade (2015):97-98,
https://hdl.handle.net/21.15107/rcub_vinar_12006 .