TY  - JOUR
AU  - Gaković, Biljana M.
AU  - Petrović, Suzana
AU  - Krmpot, Aleksandar J.
AU  - Pantelić, Dejan
AU  - Jelenković, Branislav
AU  - Stratakis, Emmanuel
AU  - Fotakis, C.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/228
AB  - In this work we reported low and high repetition frequency femtosecond laser- induced modifications of tungsten-based thin film. The tungsten-titanium (WTi) thin film, thickness of 190 nm, was deposited by sputtering on single crystal Si (100) wafer. Irradiations were performed in air by linearly polarized and focused femtosecond laser beams with following parameters: (1) pulse duration 160 fs, wavelength 800 nm, laser repetition frequency (LRF) 75 MHz - high LRF, and (2) duration 40 fs, wavelength 800 nm, LRF of 1 kHz - low LRF. The results of femtosecond lasers processing of the WTi thin film revealed laser induced periodical surface structures (LIPSS) in the case of low LRF regime. LIPSSs were formed with different periodicity and different orientation to the laser polarization at the surface: micro-scale LIPSSs with orientation perpendicular to the laser polarization and nano-scale LIPSSs parallel and perpendicular to the laser polarization. After processing of the WTi/Si system in high LRF regime ablation and nanoparticles formation were registered.
T2  - Laser and Particle Beams
T1  - Low and high repetition frequency femtosecond lasers processing of tungsten-based thin film
VL  - 32
IS  - 4
SP  - 613
EP  - 619
DO  - 10.1017/S0263034614000627
ER  - 

@article{
author = "Gaković, Biljana M. and Petrović, Suzana and Krmpot, Aleksandar J. and Pantelić, Dejan and Jelenković, Branislav and Stratakis, Emmanuel and Fotakis, C.",
year = "2014",
abstract = "In this work we reported low and high repetition frequency femtosecond laser- induced modifications of tungsten-based thin film. The tungsten-titanium (WTi) thin film, thickness of 190 nm, was deposited by sputtering on single crystal Si (100) wafer. Irradiations were performed in air by linearly polarized and focused femtosecond laser beams with following parameters: (1) pulse duration 160 fs, wavelength 800 nm, laser repetition frequency (LRF) 75 MHz - high LRF, and (2) duration 40 fs, wavelength 800 nm, LRF of 1 kHz - low LRF. The results of femtosecond lasers processing of the WTi thin film revealed laser induced periodical surface structures (LIPSS) in the case of low LRF regime. LIPSSs were formed with different periodicity and different orientation to the laser polarization at the surface: micro-scale LIPSSs with orientation perpendicular to the laser polarization and nano-scale LIPSSs parallel and perpendicular to the laser polarization. After processing of the WTi/Si system in high LRF regime ablation and nanoparticles formation were registered.",
journal = "Laser and Particle Beams",
title = "Low and high repetition frequency femtosecond lasers processing of tungsten-based thin film",
volume = "32",
number = "4",
pages = "613-619",
doi = "10.1017/S0263034614000627"
}

Gaković, B. M., Petrović, S., Krmpot, A. J., Pantelić, D., Jelenković, B., Stratakis, E.,& Fotakis, C.. (2014). Low and high repetition frequency femtosecond lasers processing of tungsten-based thin film. in Laser and Particle Beams, 32(4), 613-619.
https://doi.org/10.1017/S0263034614000627

Gaković BM, Petrović S, Krmpot AJ, Pantelić D, Jelenković B, Stratakis E, Fotakis C. Low and high repetition frequency femtosecond lasers processing of tungsten-based thin film. in Laser and Particle Beams. 2014;32(4):613-619.
doi:10.1017/S0263034614000627 .

Gaković, Biljana M., Petrović, Suzana, Krmpot, Aleksandar J., Pantelić, Dejan, Jelenković, Branislav, Stratakis, Emmanuel, Fotakis, C., "Low and high repetition frequency femtosecond lasers processing of tungsten-based thin film" in Laser and Particle Beams, 32, no. 4 (2014):613-619,
https://doi.org/10.1017/S0263034614000627 . .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Gaković, Biljana M.
AU  - Kovač, Janez
AU  - Panjan, Peter
AU  - Stratakis, Emmanuel
AU  - Trtica, Milan
AU  - Fotakis, C.
AU  - Jelenković, Branislav
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/103
AB  - The conditions of ultra-thin oxide films synthesized as the Al/Fe multilayer structures after the surface treatment with femtosecond laser radiation were studied. Thin films composed of three (Al/Fe) bilayers were deposited by DC ion sputtering on (100) Si wafers to the total thickness of 410 nm. Laser irradiations were performed by 40-fs pulses of a Ti:Sapphire laser operating at 800 nm, at fluences slightly higher than the ablation threshold. The samples were characterized by Auger electron spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. Progressed intermixing of components was achieved for the irradiation with fluence of 0.43 J cm(-2), when intermetallic phase was formed and all components were almost uniformly distributed through the entire multilayer structure. Exception is the subsurface region, to the thickness of 20 nm, where the distribution of constructive components and their oxide is changing with the distance from the surface, and this distribution depends on the applied laser fluences. An ultra-thin oxide layer was formed at the surface, with the specific combination of the oxide phases, Al2O3 and Fe2O3, depending on the applied fluences. Laser-induced modification was accompanied with the ablation of the material and the creation of parallel periodic structures. These effects of laser-induced morphological features are increased with increasing laser fluences, caused by the pronounced mobility of the materials. The special morphology of the laser-assisted synthesis of mixture of Al2O3 and Fe2O3 in the form of an ultra-thin oxide layer can improve their characteristics for functional applications, as catalysts and sensors.
T2  - Journal of Materials Science
T1  - Synthesis of ultra-thin oxide layer in laser-treated 3x (Al/Fe)/Si multilayer structure
VL  - 49
IS  - 22
SP  - 7900
EP  - 7907
DO  - 10.1007/s10853-014-8502-y
ER  - 

@article{
author = "Petrović, Suzana and Gaković, Biljana M. and Kovač, Janez and Panjan, Peter and Stratakis, Emmanuel and Trtica, Milan and Fotakis, C. and Jelenković, Branislav",
year = "2014",
abstract = "The conditions of ultra-thin oxide films synthesized as the Al/Fe multilayer structures after the surface treatment with femtosecond laser radiation were studied. Thin films composed of three (Al/Fe) bilayers were deposited by DC ion sputtering on (100) Si wafers to the total thickness of 410 nm. Laser irradiations were performed by 40-fs pulses of a Ti:Sapphire laser operating at 800 nm, at fluences slightly higher than the ablation threshold. The samples were characterized by Auger electron spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. Progressed intermixing of components was achieved for the irradiation with fluence of 0.43 J cm(-2), when intermetallic phase was formed and all components were almost uniformly distributed through the entire multilayer structure. Exception is the subsurface region, to the thickness of 20 nm, where the distribution of constructive components and their oxide is changing with the distance from the surface, and this distribution depends on the applied laser fluences. An ultra-thin oxide layer was formed at the surface, with the specific combination of the oxide phases, Al2O3 and Fe2O3, depending on the applied fluences. Laser-induced modification was accompanied with the ablation of the material and the creation of parallel periodic structures. These effects of laser-induced morphological features are increased with increasing laser fluences, caused by the pronounced mobility of the materials. The special morphology of the laser-assisted synthesis of mixture of Al2O3 and Fe2O3 in the form of an ultra-thin oxide layer can improve their characteristics for functional applications, as catalysts and sensors.",
journal = "Journal of Materials Science",
title = "Synthesis of ultra-thin oxide layer in laser-treated 3x (Al/Fe)/Si multilayer structure",
volume = "49",
number = "22",
pages = "7900-7907",
doi = "10.1007/s10853-014-8502-y"
}

Petrović, S., Gaković, B. M., Kovač, J., Panjan, P., Stratakis, E., Trtica, M., Fotakis, C.,& Jelenković, B.. (2014). Synthesis of ultra-thin oxide layer in laser-treated 3x (Al/Fe)/Si multilayer structure. in Journal of Materials Science, 49(22), 7900-7907.
https://doi.org/10.1007/s10853-014-8502-y

Petrović S, Gaković BM, Kovač J, Panjan P, Stratakis E, Trtica M, Fotakis C, Jelenković B. Synthesis of ultra-thin oxide layer in laser-treated 3x (Al/Fe)/Si multilayer structure. in Journal of Materials Science. 2014;49(22):7900-7907.
doi:10.1007/s10853-014-8502-y .

Petrović, Suzana, Gaković, Biljana M., Kovač, Janez, Panjan, Peter, Stratakis, Emmanuel, Trtica, Milan, Fotakis, C., Jelenković, Branislav, "Synthesis of ultra-thin oxide layer in laser-treated 3x (Al/Fe)/Si multilayer structure" in Journal of Materials Science, 49, no. 22 (2014):7900-7907,
https://doi.org/10.1007/s10853-014-8502-y . .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Gaković, Biljana M.
AU  - Peruško, Davor
AU  - Stratakis, Emmanuel
AU  - Bogdanović-Radović, Ivančica
AU  - Čekada, Miha
AU  - Fotakis, C.
AU  - Jelenković, Branislav
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5819
AB  - Laser-induced periodic surface structures (LIPSSs) and chemical composition changes of Ti-based nanolayered thin films (Al/Ti, Ni/Ti) after femtosecond (fs) laser pulses action were studied. Irradiation is performed using linearly polarized Ti:Sapphire fs laser pulses of 40 fs pulse duration and 800 nm wavelength. The low spatial frequency LIPSS (LSFL), oriented perpendicular to the laser polarization with periods slightly lower than the irradiation wavelength, was typically formed at elevated laser fluences. On the contrary, high spatial frequency LIPSS (HSFL) with uniform period of 155 nm, parallel to the laser light polarization, appeared at low laser fluences, as well as in the wings of the Gaussian laser beam distribution for higher used fluence. LSFL formation was associated with the material ablation process and accompanied by the intense formation of nanoparticles, especially in the Ni/Ti system. The composition changes at the surface of both multilayer systems in the LSFL area indicated the intermixing between layers and the substrate. Concentration and distribution of all constitutive elements in the irradiated area with formed HSFLs were almost unchanged. (C) 2013 AIP Publishing LLC.
T2  - Journal of Applied Physics
T1  - Femtosecond laser-induced periodic surface structure on the Ti-based nanolayered thin films
VL  - 114
IS  - 23
DO  - 10.1063/1.4848016
ER  - 

@article{
author = "Petrović, Suzana and Gaković, Biljana M. and Peruško, Davor and Stratakis, Emmanuel and Bogdanović-Radović, Ivančica and Čekada, Miha and Fotakis, C. and Jelenković, Branislav",
year = "2013",
abstract = "Laser-induced periodic surface structures (LIPSSs) and chemical composition changes of Ti-based nanolayered thin films (Al/Ti, Ni/Ti) after femtosecond (fs) laser pulses action were studied. Irradiation is performed using linearly polarized Ti:Sapphire fs laser pulses of 40 fs pulse duration and 800 nm wavelength. The low spatial frequency LIPSS (LSFL), oriented perpendicular to the laser polarization with periods slightly lower than the irradiation wavelength, was typically formed at elevated laser fluences. On the contrary, high spatial frequency LIPSS (HSFL) with uniform period of 155 nm, parallel to the laser light polarization, appeared at low laser fluences, as well as in the wings of the Gaussian laser beam distribution for higher used fluence. LSFL formation was associated with the material ablation process and accompanied by the intense formation of nanoparticles, especially in the Ni/Ti system. The composition changes at the surface of both multilayer systems in the LSFL area indicated the intermixing between layers and the substrate. Concentration and distribution of all constitutive elements in the irradiated area with formed HSFLs were almost unchanged. (C) 2013 AIP Publishing LLC.",
journal = "Journal of Applied Physics",
title = "Femtosecond laser-induced periodic surface structure on the Ti-based nanolayered thin films",
volume = "114",
number = "23",
doi = "10.1063/1.4848016"
}

Petrović, S., Gaković, B. M., Peruško, D., Stratakis, E., Bogdanović-Radović, I., Čekada, M., Fotakis, C.,& Jelenković, B.. (2013). Femtosecond laser-induced periodic surface structure on the Ti-based nanolayered thin films. in Journal of Applied Physics, 114(23).
https://doi.org/10.1063/1.4848016

Petrović S, Gaković BM, Peruško D, Stratakis E, Bogdanović-Radović I, Čekada M, Fotakis C, Jelenković B. Femtosecond laser-induced periodic surface structure on the Ti-based nanolayered thin films. in Journal of Applied Physics. 2013;114(23).
doi:10.1063/1.4848016 .

Petrović, Suzana, Gaković, Biljana M., Peruško, Davor, Stratakis, Emmanuel, Bogdanović-Radović, Ivančica, Čekada, Miha, Fotakis, C., Jelenković, Branislav, "Femtosecond laser-induced periodic surface structure on the Ti-based nanolayered thin films" in Journal of Applied Physics, 114, no. 23 (2013),
https://doi.org/10.1063/1.4848016 . .