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  - Petrović, S.
AU  - Gaković, Biljana M.
AU  - Siogka, C.
AU  - Milovanović, D.
AU  - Tsibidis, G.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11817
AB  - Nano layer thin films (NLTF), composed of alternating layers of various materials, are widely used in modern nanotechnology. Ultrafast lasers for processing is a precise non-contact method. Single pulses can be used to remove NLTF from the substrate or to accurately and selectively ablate one or more layers of the film's surface. Selective ablation can only be achieved at specified values of the laser beam's properties for a given material [1-3]. On practically any material, a laser beam can be used to produce the universal phenomena known as “laser-induced periodic surface structures” (LIPSSs). These structures are created by exposing the sample's surface to multi-pulse irradiation and have a variety of applications [4,5]. The interaction of ultrafast laser pulses with nickel/titanium (Ni/Ti) thin film was investigated. The NLTF, composed of ten alternating Ni and Ti layers, was deposited on silicon (Si) substrate by ion-sputtering. A single and multi-pulse irradiation was done in air with focused and linearly polarized laser pulses (wavelength 1026 nm and pulse duration 170 fs). For achieving selective ablation, the single pulse energy was gradually increased from near the ablation threshold to a level that completely removed the NLTF. The pulse energy for LIPSS creation was close to the ablation threshold of the NLTF. The laser induced morphology and the elemental composition changes were examined with microscopy, optical profilometry and energy dispersive X-ray spectroscopy. To interpret the experimental observations, theoretical simulation has been performed to explore the thermal response of the NLTF after irradiation with single laser pulses.
PB  - Belgrade : Vinča Institute of Nuclear Sciences
C3  - PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
T1  - Selective ablation and laser induced periodical surface structures (LIPSS) produced on (Ni/Ti) nano layer thin film with ultrafast laser pulses
SP  - 118
EP  - 118
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11817
ER  - 

@conference{
author = "Petrović, S. and Gaković, Biljana M. and Siogka, C. and Milovanović, D. and Tsibidis, G.",
year = "2023",
abstract = "Nano layer thin films (NLTF), composed of alternating layers of various materials, are widely used in modern nanotechnology. Ultrafast lasers for processing is a precise non-contact method. Single pulses can be used to remove NLTF from the substrate or to accurately and selectively ablate one or more layers of the film's surface. Selective ablation can only be achieved at specified values of the laser beam's properties for a given material [1-3]. On practically any material, a laser beam can be used to produce the universal phenomena known as “laser-induced periodic surface structures” (LIPSSs). These structures are created by exposing the sample's surface to multi-pulse irradiation and have a variety of applications [4,5]. The interaction of ultrafast laser pulses with nickel/titanium (Ni/Ti) thin film was investigated. The NLTF, composed of ten alternating Ni and Ti layers, was deposited on silicon (Si) substrate by ion-sputtering. A single and multi-pulse irradiation was done in air with focused and linearly polarized laser pulses (wavelength 1026 nm and pulse duration 170 fs). For achieving selective ablation, the single pulse energy was gradually increased from near the ablation threshold to a level that completely removed the NLTF. The pulse energy for LIPSS creation was close to the ablation threshold of the NLTF. The laser induced morphology and the elemental composition changes were examined with microscopy, optical profilometry and energy dispersive X-ray spectroscopy. To interpret the experimental observations, theoretical simulation has been performed to explore the thermal response of the NLTF after irradiation with single laser pulses.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade",
title = "Selective ablation and laser induced periodical surface structures (LIPSS) produced on (Ni/Ti) nano layer thin film with ultrafast laser pulses",
pages = "118-118",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11817"
}

Petrović, S., Gaković, B. M., Siogka, C., Milovanović, D.,& Tsibidis, G.. (2023). Selective ablation and laser induced periodical surface structures (LIPSS) produced on (Ni/Ti) nano layer thin film with ultrafast laser pulses. in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
Belgrade : Vinča Institute of Nuclear Sciences., 118-118.
https://hdl.handle.net/21.15107/rcub_vinar_11817

Petrović S, Gaković BM, Siogka C, Milovanović D, Tsibidis G. Selective ablation and laser induced periodical surface structures (LIPSS) produced on (Ni/Ti) nano layer thin film with ultrafast laser pulses. in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade. 2023;:118-118.
https://hdl.handle.net/21.15107/rcub_vinar_11817 .

Petrović, S., Gaković, Biljana M., Siogka, C., Milovanović, D., Tsibidis, G., "Selective ablation and laser induced periodical surface structures (LIPSS) produced on (Ni/Ti) nano layer thin film with ultrafast laser pulses" in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade (2023):118-118,
https://hdl.handle.net/21.15107/rcub_vinar_11817 .

TY  - JOUR
AU  - Milovanović, Dubravka S.
AU  - Rajčić, Boris
AU  - Petronić, Sanja
AU  - Radulović, Aleksandra
AU  - Radak, Bojan
AU  - Gaković, Biljana M.
AU  - Zamfirescu, Marian
AU  - Albu, Catalina
AU  - Savović, Jelena
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10116
AB  - The surface of a titanium-based alloy Ti6Al4V was subjected to modifications by a near-IR femtosecond Ti:Sapphire laser, emitting at 775 nm pulses of 200 fs duration, in single-pulse and multi-pulse regimes, with up to 400 accumulated pulses, and pulse energies ranging from 2.5 to 250 $$\upmu $$J. The whole range of induced effects is presented, from gentle ablation and pattern occurrence to substantial crater formation. Very observable laser-induced parallel periodic surface structures are reported, appearing both within the damage spot area, with low fluences, and at the peripheries of the craters, with higher fluences—but also on crater walls, and inside the crater structures. Damage threshold fluences $$({F}_{\mathrm{th}})$$and the incubation factor $$(\zeta )$$were also determined.
T2  - European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics
T1  - Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences
VL  - 76
IS  - 1
SP  - 2
DO  - 10.1140/epjd/s10053-021-00308-z
ER  - 

@article{
author = "Milovanović, Dubravka S. and Rajčić, Boris and Petronić, Sanja and Radulović, Aleksandra and Radak, Bojan and Gaković, Biljana M. and Zamfirescu, Marian and Albu, Catalina and Savović, Jelena",
year = "2022",
abstract = "The surface of a titanium-based alloy Ti6Al4V was subjected to modifications by a near-IR femtosecond Ti:Sapphire laser, emitting at 775 nm pulses of 200 fs duration, in single-pulse and multi-pulse regimes, with up to 400 accumulated pulses, and pulse energies ranging from 2.5 to 250 $$\upmu $$J. The whole range of induced effects is presented, from gentle ablation and pattern occurrence to substantial crater formation. Very observable laser-induced parallel periodic surface structures are reported, appearing both within the damage spot area, with low fluences, and at the peripheries of the craters, with higher fluences—but also on crater walls, and inside the crater structures. Damage threshold fluences $$({F}_{\mathrm{th}})$$and the incubation factor $$(\zeta )$$were also determined.",
journal = "European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics",
title = "Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences",
volume = "76",
number = "1",
pages = "2",
doi = "10.1140/epjd/s10053-021-00308-z"
}

Milovanović, D. S., Rajčić, B., Petronić, S., Radulović, A., Radak, B., Gaković, B. M., Zamfirescu, M., Albu, C.,& Savović, J.. (2022). Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences. in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics, 76(1), 2.
https://doi.org/10.1140/epjd/s10053-021-00308-z

Milovanović DS, Rajčić B, Petronić S, Radulović A, Radak B, Gaković BM, Zamfirescu M, Albu C, Savović J. Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences. in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics. 2022;76(1):2.
doi:10.1140/epjd/s10053-021-00308-z .

Milovanović, Dubravka S., Rajčić, Boris, Petronić, Sanja, Radulović, Aleksandra, Radak, Bojan, Gaković, Biljana M., Zamfirescu, Marian, Albu, Catalina, Savović, Jelena, "Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences" in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics, 76, no. 1 (2022):2,
https://doi.org/10.1140/epjd/s10053-021-00308-z . .

TY  - JOUR
AU  - Gaković, Biljana M.
AU  - Kudryashov, S. I.
AU  - Danilov, P. A.
AU  - Milovanović, D.
AU  - Panjan, Peter
AU  - Bezhanov, S. G.
AU  - Uryupin, S. A.
AU  - Ionin, A. A.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10012
AB  - Results concerning the controllable ablation of nano-layered thin films (NLTF) by femtosecond laser pulses are presented. Investigated samples were titanium-aluminum bilayers, deposited on a silicon substrate, with the top titanium or aluminum layer of variable thickness on the surface. Irradiation was done in ambient air with single femtosecond laser pulses under standard laboratory conditions. The samples were analyzed by complementary methods of optical and scanning electron microscopy and optical profilometry, exhibiting laser-fluence-dependent ablative removal either of the top layer or the entire bilayer or even partial ablation of the underlying silicon substrate. The removal (spallation) threshold fluences for the topmost layer are scalable versus its thickness almost irrespectively of its material, being rather selective for the Ti-coated samples and much less selective for the Al-coated samples. The removal of the entire bilayers was found to be strongly influenced by electronic properties of the underlying metallic layer, dictating the NLTF-Si adhesion, heat conduction, and capacity in the NLTFs toward the NLTF-Si interface and beyond, as well as by their thermophysical characteristics, e.g., almost twice higher melting temperature and enthalpy for Ti. As a result, precise fs-laser machining of the entire NLTFs is pronounced and selective for the samples with the fusible Al at the low-adhesion Al-Si interfaces, compared with the incomplete NLTF removal from the high-adhesion and refractory Ti-Si interfaces.
T2  - Applied Optics
T1  - Controllable ablative machining of Al/Ti and Ti/Al nano-layers on a Si substrate by single-pulse femtosecond laser irradiation
VL  - 60
IS  - 31
SP  - H12
EP  - H19
DO  - 10.1364/AO.432691
ER  - 

@article{
author = "Gaković, Biljana M. and Kudryashov, S. I. and Danilov, P. A. and Milovanović, D. and Panjan, Peter and Bezhanov, S. G. and Uryupin, S. A. and Ionin, A. A.",
year = "2021",
abstract = "Results concerning the controllable ablation of nano-layered thin films (NLTF) by femtosecond laser pulses are presented. Investigated samples were titanium-aluminum bilayers, deposited on a silicon substrate, with the top titanium or aluminum layer of variable thickness on the surface. Irradiation was done in ambient air with single femtosecond laser pulses under standard laboratory conditions. The samples were analyzed by complementary methods of optical and scanning electron microscopy and optical profilometry, exhibiting laser-fluence-dependent ablative removal either of the top layer or the entire bilayer or even partial ablation of the underlying silicon substrate. The removal (spallation) threshold fluences for the topmost layer are scalable versus its thickness almost irrespectively of its material, being rather selective for the Ti-coated samples and much less selective for the Al-coated samples. The removal of the entire bilayers was found to be strongly influenced by electronic properties of the underlying metallic layer, dictating the NLTF-Si adhesion, heat conduction, and capacity in the NLTFs toward the NLTF-Si interface and beyond, as well as by their thermophysical characteristics, e.g., almost twice higher melting temperature and enthalpy for Ti. As a result, precise fs-laser machining of the entire NLTFs is pronounced and selective for the samples with the fusible Al at the low-adhesion Al-Si interfaces, compared with the incomplete NLTF removal from the high-adhesion and refractory Ti-Si interfaces.",
journal = "Applied Optics",
title = "Controllable ablative machining of Al/Ti and Ti/Al nano-layers on a Si substrate by single-pulse femtosecond laser irradiation",
volume = "60",
number = "31",
pages = "H12-H19",
doi = "10.1364/AO.432691"
}

Gaković, B. M., Kudryashov, S. I., Danilov, P. A., Milovanović, D., Panjan, P., Bezhanov, S. G., Uryupin, S. A.,& Ionin, A. A.. (2021). Controllable ablative machining of Al/Ti and Ti/Al nano-layers on a Si substrate by single-pulse femtosecond laser irradiation. in Applied Optics, 60(31), H12-H19.
https://doi.org/10.1364/AO.432691

Gaković BM, Kudryashov SI, Danilov PA, Milovanović D, Panjan P, Bezhanov SG, Uryupin SA, Ionin AA. Controllable ablative machining of Al/Ti and Ti/Al nano-layers on a Si substrate by single-pulse femtosecond laser irradiation. in Applied Optics. 2021;60(31):H12-H19.
doi:10.1364/AO.432691 .

Gaković, Biljana M., Kudryashov, S. I., Danilov, P. A., Milovanović, D., Panjan, Peter, Bezhanov, S. G., Uryupin, S. A., Ionin, A. A., "Controllable ablative machining of Al/Ti and Ti/Al nano-layers on a Si substrate by single-pulse femtosecond laser irradiation" in Applied Optics, 60, no. 31 (2021):H12-H19,
https://doi.org/10.1364/AO.432691 . .

TY  - JOUR
AU  - Gaković, Biljana M.
AU  - Danilov, Pavel A.
AU  - Kudryashov, Sergey I.
AU  - Milovanović, Dubravka S.
AU  - Radulović, Aleksandra 
AU  - Panjan, Peter
AU  - Ionin, Andrey A.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10038
AB  - Results regarding morphological and compositional changes of bimetallic thin film (BMTF), composed of aluminium (Al) and titanium (Ti) nano-layers, by single fs laser pulses, are presented. Laser irradiation was conducted in the air with focused, linearly polarized laser pulses, the duration being 300 fs, wavelength 515 nm, and pulse energy up to 1.2μJ. Effects of the variations of the pulse energy on the changes were studied. In the experiment, single pulse energy values from 0.03 to 0.08 μ J caused ablation–photomechanical spallation of the upper part of BMTF layer from the Si substrate, without ablation of the whole film. Irradiation at higher pulse energies gradually removed the whole BMTF and even a part of the Si substrate. We explained the influence of different electron–phonon dynamics, in the case of multilayered thin films composed of Al and Ti, on BMTF ablation. Damage/ablation threshold, which is minimal pulse energy/fluence sufficient for starting ablation, was calculated. Graphic abstract: [Figure not available: see fulltext.] © 2021, The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature.
T2  - European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics
T1  - The morphological and compositional changes of bimetallic Ti/Al thin film induced by ultra-short laser pulses
VL  - 75
IS  - 11
DO  - 10.1140/epjd/s10053-021-00292-4
ER  - 

@article{
author = "Gaković, Biljana M. and Danilov, Pavel A. and Kudryashov, Sergey I. and Milovanović, Dubravka S. and Radulović, Aleksandra  and Panjan, Peter and Ionin, Andrey A.",
year = "2021",
abstract = "Results regarding morphological and compositional changes of bimetallic thin film (BMTF), composed of aluminium (Al) and titanium (Ti) nano-layers, by single fs laser pulses, are presented. Laser irradiation was conducted in the air with focused, linearly polarized laser pulses, the duration being 300 fs, wavelength 515 nm, and pulse energy up to 1.2μJ. Effects of the variations of the pulse energy on the changes were studied. In the experiment, single pulse energy values from 0.03 to 0.08 μ J caused ablation–photomechanical spallation of the upper part of BMTF layer from the Si substrate, without ablation of the whole film. Irradiation at higher pulse energies gradually removed the whole BMTF and even a part of the Si substrate. We explained the influence of different electron–phonon dynamics, in the case of multilayered thin films composed of Al and Ti, on BMTF ablation. Damage/ablation threshold, which is minimal pulse energy/fluence sufficient for starting ablation, was calculated. Graphic abstract: [Figure not available: see fulltext.] © 2021, The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature.",
journal = "European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics",
title = "The morphological and compositional changes of bimetallic Ti/Al thin film induced by ultra-short laser pulses",
volume = "75",
number = "11",
doi = "10.1140/epjd/s10053-021-00292-4"
}

Gaković, B. M., Danilov, P. A., Kudryashov, S. I., Milovanović, D. S., Radulović, A., Panjan, P.,& Ionin, A. A.. (2021). The morphological and compositional changes of bimetallic Ti/Al thin film induced by ultra-short laser pulses. in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics, 75(11).
https://doi.org/10.1140/epjd/s10053-021-00292-4

Gaković BM, Danilov PA, Kudryashov SI, Milovanović DS, Radulović A, Panjan P, Ionin AA. The morphological and compositional changes of bimetallic Ti/Al thin film induced by ultra-short laser pulses. in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics. 2021;75(11).
doi:10.1140/epjd/s10053-021-00292-4 .

Gaković, Biljana M., Danilov, Pavel A., Kudryashov, Sergey I., Milovanović, Dubravka S., Radulović, Aleksandra , Panjan, Peter, Ionin, Andrey A., "The morphological and compositional changes of bimetallic Ti/Al thin film induced by ultra-short laser pulses" in European Physical Journal D. Atoms, Molecules, Clusters and Optical Physics, 75, no. 11 (2021),
https://doi.org/10.1140/epjd/s10053-021-00292-4 . .

TY  - JOUR
AU  - Smirnov, Nikita A.
AU  - Kudryashov, Sergey I.
AU  - Danilov, Pavel A.
AU  - Rudenko, Andrey A.
AU  - Gaković, Biljana M.
AU  - Milovanović, Dubravka S.
AU  - Ionin, Andrey A.
AU  - Nastulyavichus, Alena A.
AU  - Umanskaya, S. F.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8412
AB  - Single-pulse microprocessing of a steel surface with a variable pulse width (0.3-12.3 ps) and a wavelength of 515 nm was performed. The morphology of the craters was visualized by a scanning electron microscope and an optical profilometer. The nonmonotonic behavior of ablation thresholds with a minimum at ≈1.5 ps, due to achieving the electron-phonon relaxation time of the absorbed energy in the steel was revealed. It is shown that, with an increase in the pulse width in the considered width range, the efficiency of the ablation decreases by a factor of 2, which is explained by the partial transition from the phase explosion to the surface evaporation. © 2019 Astro Ltd.
T2  - Laser Physics Letters
T1  - Microprocessing of a steel surface by single pulses of variable width
VL  - 16
IS  - 5
SP  - 056002
DO  - 10.1088/1612-202X/ab0c85
ER  - 

@article{
author = "Smirnov, Nikita A. and Kudryashov, Sergey I. and Danilov, Pavel A. and Rudenko, Andrey A. and Gaković, Biljana M. and Milovanović, Dubravka S. and Ionin, Andrey A. and Nastulyavichus, Alena A. and Umanskaya, S. F.",
year = "2019",
abstract = "Single-pulse microprocessing of a steel surface with a variable pulse width (0.3-12.3 ps) and a wavelength of 515 nm was performed. The morphology of the craters was visualized by a scanning electron microscope and an optical profilometer. The nonmonotonic behavior of ablation thresholds with a minimum at ≈1.5 ps, due to achieving the electron-phonon relaxation time of the absorbed energy in the steel was revealed. It is shown that, with an increase in the pulse width in the considered width range, the efficiency of the ablation decreases by a factor of 2, which is explained by the partial transition from the phase explosion to the surface evaporation. © 2019 Astro Ltd.",
journal = "Laser Physics Letters",
title = "Microprocessing of a steel surface by single pulses of variable width",
volume = "16",
number = "5",
pages = "056002",
doi = "10.1088/1612-202X/ab0c85"
}

Smirnov, N. A., Kudryashov, S. I., Danilov, P. A., Rudenko, A. A., Gaković, B. M., Milovanović, D. S., Ionin, A. A., Nastulyavichus, A. A.,& Umanskaya, S. F.. (2019). Microprocessing of a steel surface by single pulses of variable width. in Laser Physics Letters, 16(5), 056002.
https://doi.org/10.1088/1612-202X/ab0c85

Smirnov NA, Kudryashov SI, Danilov PA, Rudenko AA, Gaković BM, Milovanović DS, Ionin AA, Nastulyavichus AA, Umanskaya SF. Microprocessing of a steel surface by single pulses of variable width. in Laser Physics Letters. 2019;16(5):056002.
doi:10.1088/1612-202X/ab0c85 .

Smirnov, Nikita A., Kudryashov, Sergey I., Danilov, Pavel A., Rudenko, Andrey A., Gaković, Biljana M., Milovanović, Dubravka S., Ionin, Andrey A., Nastulyavichus, Alena A., Umanskaya, S. F., "Microprocessing of a steel surface by single pulses of variable width" in Laser Physics Letters, 16, no. 5 (2019):056002,
https://doi.org/10.1088/1612-202X/ab0c85 . .

TY  - JOUR
AU  - Kudryashov, Sergey I.
AU  - Smirnov, Nikita A.
AU  - Gaković, Biljana M.
AU  - Milovanović, Dubravka S.
AU  - Bezhanov, Stanislav G.
AU  - Uryupin, Sergey A.
AU  - Ionin, Andrey A.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8535
AB  - The dependences of the depth of single-pulse ablation of the steel surface on the energy density of ultrashort laser pulses (0.3–12 ps) with a wavelength of 515 nm have the form different from the usual logarithmic one for linear absorption of radiation. Since the density of states of free conduction electrons in the s band is low, and the d band of strongly bound electrons with a high density of states is located around the Fermi level, these dependences have been approximated within the two-photon absorption model. The two-photon absorption coefficient increases almost linearly with the duration of laser pulses, which indicates the saturation of absorption and allows estimating the corresponding parameters of the electronic subsystem. © 2019, Pleiades Publishing, Inc.
T2  - JETP Letters
T1  - Dependence of the Two-Photon Absorption Coefficient of Steel on the Pulse Duration During Its Ablation by Femto- and Picosecond Laser Pulses
VL  - 110
IS  - 2
SP  - 107
EP  - 110
DO  - 10.1134/S0021364019140091
ER  - 

@article{
author = "Kudryashov, Sergey I. and Smirnov, Nikita A. and Gaković, Biljana M. and Milovanović, Dubravka S. and Bezhanov, Stanislav G. and Uryupin, Sergey A. and Ionin, Andrey A.",
year = "2019",
abstract = "The dependences of the depth of single-pulse ablation of the steel surface on the energy density of ultrashort laser pulses (0.3–12 ps) with a wavelength of 515 nm have the form different from the usual logarithmic one for linear absorption of radiation. Since the density of states of free conduction electrons in the s band is low, and the d band of strongly bound electrons with a high density of states is located around the Fermi level, these dependences have been approximated within the two-photon absorption model. The two-photon absorption coefficient increases almost linearly with the duration of laser pulses, which indicates the saturation of absorption and allows estimating the corresponding parameters of the electronic subsystem. © 2019, Pleiades Publishing, Inc.",
journal = "JETP Letters",
title = "Dependence of the Two-Photon Absorption Coefficient of Steel on the Pulse Duration During Its Ablation by Femto- and Picosecond Laser Pulses",
volume = "110",
number = "2",
pages = "107-110",
doi = "10.1134/S0021364019140091"
}

Kudryashov, S. I., Smirnov, N. A., Gaković, B. M., Milovanović, D. S., Bezhanov, S. G., Uryupin, S. A.,& Ionin, A. A.. (2019). Dependence of the Two-Photon Absorption Coefficient of Steel on the Pulse Duration During Its Ablation by Femto- and Picosecond Laser Pulses. in JETP Letters, 110(2), 107-110.
https://doi.org/10.1134/S0021364019140091

Kudryashov SI, Smirnov NA, Gaković BM, Milovanović DS, Bezhanov SG, Uryupin SA, Ionin AA. Dependence of the Two-Photon Absorption Coefficient of Steel on the Pulse Duration During Its Ablation by Femto- and Picosecond Laser Pulses. in JETP Letters. 2019;110(2):107-110.
doi:10.1134/S0021364019140091 .

Kudryashov, Sergey I., Smirnov, Nikita A., Gaković, Biljana M., Milovanović, Dubravka S., Bezhanov, Stanislav G., Uryupin, Sergey A., Ionin, Andrey A., "Dependence of the Two-Photon Absorption Coefficient of Steel on the Pulse Duration During Its Ablation by Femto- and Picosecond Laser Pulses" in JETP Letters, 110, no. 2 (2019):107-110,
https://doi.org/10.1134/S0021364019140091 . .

TY  - CONF
AU  - Kudryashov, S.
AU  - Samokhvalov, A.
AU  - Danilov, P.
AU  - Smirnov, N.
AU  - Shelygina, S.
AU  - Busleev, N.
AU  - Ivanova, A.
AU  - Rudenko, A.
AU  - Bezhanov, S.
AU  - Uryupin, S.
AU  - Veiko, V.
AU  - Gaković, Biljana M.
AU  - Milovanović, D.
AU  - Ionin, A.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11859
AB  - Over the past 10 years the authors explored ultrafast linear and nonlinear optical and electronic dynamics in strongly electronically-excited transition metals [1-6], including the common plasmonic noble metals. Pump/probe reflectometry and electrical collector techniques were applied to reveal concerted prompt saturation of inter-band absorption and band-filling [1, 2], accompanied by free-electron heating and emission. Ultrafast broadband in situ transmission spectroscopy supported these findings for ultrafast non-linear photoexcitation in noble metals, demonstrating prompt blue-shifting of localized plasmon resonance in colloidal nanoparticles.
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  - Ultrafast non-linear optical and electronic dynamics in transition metals: superplasmonic states and hot electrons for advanced applications
SP  - 24
EP  - 24
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11859
ER  - 

@conference{
author = "Kudryashov, S. and Samokhvalov, A. and Danilov, P. and Smirnov, N. and Shelygina, S. and Busleev, N. and Ivanova, A. and Rudenko, A. and Bezhanov, S. and Uryupin, S. and Veiko, V. and Gaković, Biljana M. and Milovanović, D. and Ionin, A.",
year = "2019",
abstract = "Over the past 10 years the authors explored ultrafast linear and nonlinear optical and electronic dynamics in strongly electronically-excited transition metals [1-6], including the common plasmonic noble metals. Pump/probe reflectometry and electrical collector techniques were applied to reveal concerted prompt saturation of inter-band absorption and band-filling [1, 2], accompanied by free-electron heating and emission. Ultrafast broadband in situ transmission spectroscopy supported these findings for ultrafast non-linear photoexcitation in noble metals, demonstrating prompt blue-shifting of localized plasmon resonance in colloidal nanoparticles.",
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 = "Ultrafast non-linear optical and electronic dynamics in transition metals: superplasmonic states and hot electrons for advanced applications",
pages = "24-24",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11859"
}

Kudryashov, S., Samokhvalov, A., Danilov, P., Smirnov, N., Shelygina, S., Busleev, N., Ivanova, A., Rudenko, A., Bezhanov, S., Uryupin, S., Veiko, V., Gaković, B. M., Milovanović, D.,& Ionin, A.. (2019). Ultrafast non-linear optical and electronic dynamics in transition metals: superplasmonic states and hot electrons for advanced applications. 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., 24-24.
https://hdl.handle.net/21.15107/rcub_vinar_11859

Kudryashov S, Samokhvalov A, Danilov P, Smirnov N, Shelygina S, Busleev N, Ivanova A, Rudenko A, Bezhanov S, Uryupin S, Veiko V, Gaković BM, Milovanović D, Ionin A. Ultrafast non-linear optical and electronic dynamics in transition metals: superplasmonic states and hot electrons for advanced applications. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts. 2019;:24-24.
https://hdl.handle.net/21.15107/rcub_vinar_11859 .

Kudryashov, S., Samokhvalov, A., Danilov, P., Smirnov, N., Shelygina, S., Busleev, N., Ivanova, A., Rudenko, A., Bezhanov, S., Uryupin, S., Veiko, V., Gaković, Biljana M., Milovanović, D., Ionin, A., "Ultrafast non-linear optical and electronic dynamics in transition metals: superplasmonic states and hot electrons for advanced applications" in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts (2019):24-24,
https://hdl.handle.net/21.15107/rcub_vinar_11859 .

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  - CONF
AU  - Gaković, Biljana M.
AU  - Petrović, S.
AU  - Peruško, Davor
AU  - Mimidis, A.
AU  - Kavatzikidou, E.
AU  - Stratakis, E.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12441
AB  - Femtosecond laser texturing holds promise for the surface modification of materials, due to a wide application to all materials; the possibility of getting a wide variety of structures with micro- and nano-scaled features; and a fast, repeatable and contactless process. Laser processing is unique method, which allows production of active surface with formation of the desired oxide, creation of nano/micro textures and change wettability of the surface. Due to excellent mechanical properties and moderate biocompatibility, Ti/Zr multi- layer thin films, as novel nanolayered composites were deposited by ion sputtering on Si substrate. Subsequently, the Ti/Zr thin films were irradiated by femtosecond laser pulses in air to induce the following modifications: (i) mixing of components within the thin film structures, (ii) formation of ultrathin oxide layer at the irradiated surfaces, and (iii) structuring of the surface arrays in form of ripple structure. The main focus of this experimental study was examined different surface motives with nano- and micrometre features. For this purpose, the modifications of Ti/Zr multilayers were included forma- tion of spots, lines and surfaces with different pulse energy, scanning speed i.e. number of pulses, z-distance. Laser-induced spots are composed of concentric circles, where the number of circles in individual spots is increased with increasing pulse energy. Maxi- mum depth in the centre of spots and total roughness are gradually rising with pulse energy, but heights between ablated layers in these spots does not match with the thick- ness of layers, but these deviations are not significant. Lines and surfaces were scanned with different scanning rate, the conditions for formation of well-defined LSFL (low spa- tial frequency LIPSS) are determined. The periodic structures at high scanning rate (3 mm/s) are mainly formed on the multilayer thin film. However, the degree of ablation becomes higher at the lowest rate (0.5 mm/s) where the ripples mostly are formed on the Si substrate.
PB  - Moscow : Lebedev Physical Institute
C3  - UltrafastLight-2018 : International Conference on Ultrafast Optical Science : Book of Abstracts
T1  - Modification of Ti/Zr multilayer by femtosecond laser pulses
SP  - 100
EP  - 100
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12441
ER  - 

@conference{
author = "Gaković, Biljana M. and Petrović, S. and Peruško, Davor and Mimidis, A. and Kavatzikidou, E. and Stratakis, E.",
year = "2018",
abstract = "Femtosecond laser texturing holds promise for the surface modification of materials, due to a wide application to all materials; the possibility of getting a wide variety of structures with micro- and nano-scaled features; and a fast, repeatable and contactless process. Laser processing is unique method, which allows production of active surface with formation of the desired oxide, creation of nano/micro textures and change wettability of the surface. Due to excellent mechanical properties and moderate biocompatibility, Ti/Zr multi- layer thin films, as novel nanolayered composites were deposited by ion sputtering on Si substrate. Subsequently, the Ti/Zr thin films were irradiated by femtosecond laser pulses in air to induce the following modifications: (i) mixing of components within the thin film structures, (ii) formation of ultrathin oxide layer at the irradiated surfaces, and (iii) structuring of the surface arrays in form of ripple structure. The main focus of this experimental study was examined different surface motives with nano- and micrometre features. For this purpose, the modifications of Ti/Zr multilayers were included forma- tion of spots, lines and surfaces with different pulse energy, scanning speed i.e. number of pulses, z-distance. Laser-induced spots are composed of concentric circles, where the number of circles in individual spots is increased with increasing pulse energy. Maxi- mum depth in the centre of spots and total roughness are gradually rising with pulse energy, but heights between ablated layers in these spots does not match with the thick- ness of layers, but these deviations are not significant. Lines and surfaces were scanned with different scanning rate, the conditions for formation of well-defined LSFL (low spa- tial frequency LIPSS) are determined. The periodic structures at high scanning rate (3 mm/s) are mainly formed on the multilayer thin film. However, the degree of ablation becomes higher at the lowest rate (0.5 mm/s) where the ripples mostly are formed on the Si substrate.",
publisher = "Moscow : Lebedev Physical Institute",
journal = "UltrafastLight-2018 : International Conference on Ultrafast Optical Science : Book of Abstracts",
title = "Modification of Ti/Zr multilayer by femtosecond laser pulses",
pages = "100-100",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12441"
}

Gaković, B. M., Petrović, S., Peruško, D., Mimidis, A., Kavatzikidou, E.,& Stratakis, E.. (2018). Modification of Ti/Zr multilayer by femtosecond laser pulses. in UltrafastLight-2018 : International Conference on Ultrafast Optical Science : Book of Abstracts
Moscow : Lebedev Physical Institute., 100-100.
https://hdl.handle.net/21.15107/rcub_vinar_12441

Gaković BM, Petrović S, Peruško D, Mimidis A, Kavatzikidou E, Stratakis E. Modification of Ti/Zr multilayer by femtosecond laser pulses. in UltrafastLight-2018 : International Conference on Ultrafast Optical Science : Book of Abstracts. 2018;:100-100.
https://hdl.handle.net/21.15107/rcub_vinar_12441 .

Gaković, Biljana M., Petrović, S., Peruško, Davor, Mimidis, A., Kavatzikidou, E., Stratakis, E., "Modification of Ti/Zr multilayer by femtosecond laser pulses" in UltrafastLight-2018 : International Conference on Ultrafast Optical Science : Book of Abstracts (2018):100-100,
https://hdl.handle.net/21.15107/rcub_vinar_12441 .

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  - JOUR
AU  - Petrović, Suzana
AU  - Gaković, Biljana M.
AU  - Zamfirescu, M.
AU  - Radu, C.
AU  - Peruško, Davor
AU  - Radak, Bojan
AU  - Ristoscu, Carmen
AU  - Zdravković, Slobodan
AU  - Luculescu, C. L.
AU  - Mihailescu, Ion N.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7164
AB  - Modification of single and complex nickel-palladium samples by laser processing in the femtosecond time domain was studied. The samples were processed by focused Ti:Sapphire laser beam (Clark CPA-2101) with 775 nm laser wavelength, 2 kHz repetition rate, 200 fs pulse duration. The laser-induced morphological modifications have shown dependence on the applied fluences and number of laser pulses. The formed surface nanostructures on the single NiPd/Si and multilayer 5x(Ni/Pd)/Si systems are compared with individual Ni and Pd thin films. The results show an increase in surface roughness, formation of parallel periodic surface structures, appearance of hydrodynamic features and ablation of surface material. At low number of pulses (less than 10 pulses) and low pulse energies range (not over 1.7 mu J), the two types of laser-induced periodic surface structure (LIPSS) can be observed: low and high spatial frequency LIPSS (HSFL and LSFL). For all samples, the measured LSFL periods were 720 nm for the ripples created solely on thin film surfaces during the single pulse action. In the case of the multi-pulse irradiation, the periodicities of created LSFLs on the all investigated thin films have shown tendency to reduction with increasing of pulse energies. (C) 2016 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Femtosecond laser processing of NiPd single and 5x(Ni/Pd) multilayer thin films
VL  - 417
SP  - 16
EP  - 22
DO  - 10.1016/j.apsusc.2016.12.142
ER  - 

@article{
author = "Petrović, Suzana and Gaković, Biljana M. and Zamfirescu, M. and Radu, C. and Peruško, Davor and Radak, Bojan and Ristoscu, Carmen and Zdravković, Slobodan and Luculescu, C. L. and Mihailescu, Ion N.",
year = "2017",
abstract = "Modification of single and complex nickel-palladium samples by laser processing in the femtosecond time domain was studied. The samples were processed by focused Ti:Sapphire laser beam (Clark CPA-2101) with 775 nm laser wavelength, 2 kHz repetition rate, 200 fs pulse duration. The laser-induced morphological modifications have shown dependence on the applied fluences and number of laser pulses. The formed surface nanostructures on the single NiPd/Si and multilayer 5x(Ni/Pd)/Si systems are compared with individual Ni and Pd thin films. The results show an increase in surface roughness, formation of parallel periodic surface structures, appearance of hydrodynamic features and ablation of surface material. At low number of pulses (less than 10 pulses) and low pulse energies range (not over 1.7 mu J), the two types of laser-induced periodic surface structure (LIPSS) can be observed: low and high spatial frequency LIPSS (HSFL and LSFL). For all samples, the measured LSFL periods were 720 nm for the ripples created solely on thin film surfaces during the single pulse action. In the case of the multi-pulse irradiation, the periodicities of created LSFLs on the all investigated thin films have shown tendency to reduction with increasing of pulse energies. (C) 2016 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Femtosecond laser processing of NiPd single and 5x(Ni/Pd) multilayer thin films",
volume = "417",
pages = "16-22",
doi = "10.1016/j.apsusc.2016.12.142"
}

Petrović, S., Gaković, B. M., Zamfirescu, M., Radu, C., Peruško, D., Radak, B., Ristoscu, C., Zdravković, S., Luculescu, C. L.,& Mihailescu, I. N.. (2017). Femtosecond laser processing of NiPd single and 5x(Ni/Pd) multilayer thin films. in Applied Surface Science, 417, 16-22.
https://doi.org/10.1016/j.apsusc.2016.12.142

Petrović S, Gaković BM, Zamfirescu M, Radu C, Peruško D, Radak B, Ristoscu C, Zdravković S, Luculescu CL, Mihailescu IN. Femtosecond laser processing of NiPd single and 5x(Ni/Pd) multilayer thin films. in Applied Surface Science. 2017;417:16-22.
doi:10.1016/j.apsusc.2016.12.142 .

Petrović, Suzana, Gaković, Biljana M., Zamfirescu, M., Radu, C., Peruško, Davor, Radak, Bojan, Ristoscu, Carmen, Zdravković, Slobodan, Luculescu, C. L., Mihailescu, Ion N., "Femtosecond laser processing of NiPd single and 5x(Ni/Pd) multilayer thin films" in Applied Surface Science, 417 (2017):16-22,
https://doi.org/10.1016/j.apsusc.2016.12.142 . .

TY  - CONF
AU  - Gaković, Biljana M.
AU  - Petrović, Suzana
AU  - Panjan, P.
AU  - Kovač, J.
AU  - Lazović, V.
AU  - Ristoscu, C.
AU  - Negut, I.
AU  - Mihailescu, I. N.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10945
AB  - The effects of UV nanosecond laser pulses on multilayer CrN/(Cr,V)N coatings were studied. In the experiment laser irradiation was performed in air at 248 nm wavelength and pulse duration of 25 ns. The surface composition and microstructure was analyzed depending on the initial content of vanadium in the coatings and number of accumulated laser pulses at a fluence of 0.17 Jcm-2 . Most of the absorbed laser energy was rapidly transformed into heat, producing intensive modifications of the composition and morphology of the multilayer structure.The result has shown that concentration of metallic components was homogeneously distributed inside the coatings. However, on the surface and in the sub-surface regions the contents of Cr and V were decreased due to oxidation. The composition and thickness of created mixture of oxides Cr2O3 and V2O5 depend on the number of laser pulses and initial V content. Laser induced surface morphology changes of the multilayer CrN/(Cr,V)N coatingswere registered at the irradiation areas: (i) grainy structures at peripheries, (ii) cracks and (iii) irregular closed shapes in the center.
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  - Effects of nanosecond laser pulses at 248 nm wavelength on multilayer CrN/(Cr,V)N coatings
SP  - 174
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10945
ER  - 

@conference{
author = "Gaković, Biljana M. and Petrović, Suzana and Panjan, P. and Kovač, J. and Lazović, V. and Ristoscu, C. and Negut, I. and Mihailescu, I. N.",
year = "2017",
abstract = "The effects of UV nanosecond laser pulses on multilayer CrN/(Cr,V)N coatings were studied. In the experiment laser irradiation was performed in air at 248 nm wavelength and pulse duration of 25 ns. The surface composition and microstructure was analyzed depending on the initial content of vanadium in the coatings and number of accumulated laser pulses at a fluence of 0.17 Jcm-2 . Most of the absorbed laser energy was rapidly transformed into heat, producing intensive modifications of the composition and morphology of the multilayer structure.The result has shown that concentration of metallic components was homogeneously distributed inside the coatings. However, on the surface and in the sub-surface regions the contents of Cr and V were decreased due to oxidation. The composition and thickness of created mixture of oxides Cr2O3 and V2O5 depend on the number of laser pulses and initial V content. Laser induced surface morphology changes of the multilayer CrN/(Cr,V)N coatingswere registered at the irradiation areas: (i) grainy structures at peripheries, (ii) cracks and (iii) irregular closed shapes in the center.",
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 = "Effects of nanosecond laser pulses at 248 nm wavelength on multilayer CrN/(Cr,V)N coatings",
pages = "174",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10945"
}

Gaković, B. M., Petrović, S., Panjan, P., Kovač, J., Lazović, V., Ristoscu, C., Negut, I.,& Mihailescu, I. N.. (2017). Effects of nanosecond laser pulses at 248 nm wavelength on multilayer CrN/(Cr,V)N coatings. 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., 174.
https://hdl.handle.net/21.15107/rcub_vinar_10945

Gaković BM, Petrović S, Panjan P, Kovač J, Lazović V, Ristoscu C, Negut I, Mihailescu IN. Effects of nanosecond laser pulses at 248 nm wavelength on multilayer CrN/(Cr,V)N coatings. in PHOTONICA2017 : 6th International School and Conference on Photonics and COST actions: MP1406 and MP1402 : Program and the book of abstracts. 2017;:174.
https://hdl.handle.net/21.15107/rcub_vinar_10945 .

Gaković, Biljana M., Petrović, Suzana, Panjan, P., Kovač, J., Lazović, V., Ristoscu, C., Negut, I., Mihailescu, I. N., "Effects of nanosecond laser pulses at 248 nm wavelength on multilayer CrN/(Cr,V)N coatings" in PHOTONICA2017 : 6th International School and Conference on Photonics and COST actions: MP1406 and MP1402 : Program and the book of abstracts (2017):174,
https://hdl.handle.net/21.15107/rcub_vinar_10945 .

TY  - JOUR
AU  - Gaković, Biljana M.
AU  - Petrović, Suzana
AU  - Albu, C.
AU  - Zamfirescu, M.
AU  - Panjan, Peter
AU  - Milovanović, Dubravka S.
AU  - Popescu-Pelin, G.
AU  - Mihailescu, Ion N.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1326
AB  - Processing of AlTiN/TiN multilayered hard coatings by femtosecond (fs) laser pulses has been investigated. Irradiation was performed in air with linearly polarized laser radiation with pulses of 200 fs duration at 775 nm wavelength. Single or 1000 subsequent laser pulses were directed at normal incidence towards target surface. Laser energy per pulse was adjusted from 0.5 to 50 mu J and corresponding fluence was 0.17-17.5 J cm(-2). The as deposited and laser-ablated samples were characterized by optical confocal microscopy, optical profilometry and scanning and transmition electron microscopy. In case of the AlTiN/TiN coating, a single-pulse damage threshold of 0.41 J cm(-2) was estimated. Well defined holes/craters with diameters from 7 to 35 mu m, up to 40 mu m depth were drilled, depending on laser pulse energy and number, after 1000 laser pulses. For small energy/fluence, laser induced periodical surface structures were observed. A model is discussed which can account for these features by the accumulation effect during multi-pulse irradiation. The forming craters can prove useful for fabrication of micron solid state lubricant reservoirs in the protective coating-steel system.
T2  - Optics and Laser Technology
T1  - Precise femtosecond laser crater fabrication in hard nanolayered AlTiN/TiN coating on steel substrate
VL  - 89
SP  - 200
EP  - 207
DO  - 10.1016/j.optlastec.2016.10.015
ER  - 

@article{
author = "Gaković, Biljana M. and Petrović, Suzana and Albu, C. and Zamfirescu, M. and Panjan, Peter and Milovanović, Dubravka S. and Popescu-Pelin, G. and Mihailescu, Ion N.",
year = "2017",
abstract = "Processing of AlTiN/TiN multilayered hard coatings by femtosecond (fs) laser pulses has been investigated. Irradiation was performed in air with linearly polarized laser radiation with pulses of 200 fs duration at 775 nm wavelength. Single or 1000 subsequent laser pulses were directed at normal incidence towards target surface. Laser energy per pulse was adjusted from 0.5 to 50 mu J and corresponding fluence was 0.17-17.5 J cm(-2). The as deposited and laser-ablated samples were characterized by optical confocal microscopy, optical profilometry and scanning and transmition electron microscopy. In case of the AlTiN/TiN coating, a single-pulse damage threshold of 0.41 J cm(-2) was estimated. Well defined holes/craters with diameters from 7 to 35 mu m, up to 40 mu m depth were drilled, depending on laser pulse energy and number, after 1000 laser pulses. For small energy/fluence, laser induced periodical surface structures were observed. A model is discussed which can account for these features by the accumulation effect during multi-pulse irradiation. The forming craters can prove useful for fabrication of micron solid state lubricant reservoirs in the protective coating-steel system.",
journal = "Optics and Laser Technology",
title = "Precise femtosecond laser crater fabrication in hard nanolayered AlTiN/TiN coating on steel substrate",
volume = "89",
pages = "200-207",
doi = "10.1016/j.optlastec.2016.10.015"
}

Gaković, B. M., Petrović, S., Albu, C., Zamfirescu, M., Panjan, P., Milovanović, D. S., Popescu-Pelin, G.,& Mihailescu, I. N.. (2017). Precise femtosecond laser crater fabrication in hard nanolayered AlTiN/TiN coating on steel substrate. in Optics and Laser Technology, 89, 200-207.
https://doi.org/10.1016/j.optlastec.2016.10.015

Gaković BM, Petrović S, Albu C, Zamfirescu M, Panjan P, Milovanović DS, Popescu-Pelin G, Mihailescu IN. Precise femtosecond laser crater fabrication in hard nanolayered AlTiN/TiN coating on steel substrate. in Optics and Laser Technology. 2017;89:200-207.
doi:10.1016/j.optlastec.2016.10.015 .

Gaković, Biljana M., Petrović, Suzana, Albu, C., Zamfirescu, M., Panjan, Peter, Milovanović, Dubravka S., Popescu-Pelin, G., Mihailescu, Ion N., "Precise femtosecond laser crater fabrication in hard nanolayered AlTiN/TiN coating on steel substrate" in Optics and Laser Technology, 89 (2017):200-207,
https://doi.org/10.1016/j.optlastec.2016.10.015 . .

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 . .

TY  - CONF
AU  - Chumakov, A. N.
AU  - Nikonchuk, I. S.
AU  - Gaković, Biljana M.
AU  - Petrović, Suzana
AU  - Trtica, Milan
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12470
AB  - Features of submicron structures and oxides formation on steel in air and liquids under laser irradiation are investigated experimentally.
PB  - Minsk : National Academy of Sciences of Belarus; B.I. Stepanov Institute of Physics
C3  - XI Belarusian-Serbian Symposium "Physics and Diagnostics of Laboratory and Astrophysical Plasmas" (РDР-11) : Proceedings
T1  - Formation of microstructures and oxides on steel surface by laser irradiation in air and liquids
SP  - 87
EP  - 90
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12470
ER  - 

@conference{
author = "Chumakov, A. N. and Nikonchuk, I. S. and Gaković, Biljana M. and Petrović, Suzana and Trtica, Milan",
year = "2016",
abstract = "Features of submicron structures and oxides formation on steel in air and liquids under laser irradiation are investigated experimentally.",
publisher = "Minsk : National Academy of Sciences of Belarus; B.I. Stepanov Institute of Physics",
journal = "XI Belarusian-Serbian Symposium "Physics and Diagnostics of Laboratory and Astrophysical Plasmas" (РDР-11) : Proceedings",
title = "Formation of microstructures and oxides on steel surface by laser irradiation in air and liquids",
pages = "87-90",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12470"
}

Chumakov, A. N., Nikonchuk, I. S., Gaković, B. M., Petrović, S.,& Trtica, M.. (2016). Formation of microstructures and oxides on steel surface by laser irradiation in air and liquids. in XI Belarusian-Serbian Symposium "Physics and Diagnostics of Laboratory and Astrophysical Plasmas" (РDР-11) : Proceedings
Minsk : National Academy of Sciences of Belarus; B.I. Stepanov Institute of Physics., 87-90.
https://hdl.handle.net/21.15107/rcub_vinar_12470

Chumakov AN, Nikonchuk IS, Gaković BM, Petrović S, Trtica M. Formation of microstructures and oxides on steel surface by laser irradiation in air and liquids. in XI Belarusian-Serbian Symposium "Physics and Diagnostics of Laboratory and Astrophysical Plasmas" (РDР-11) : Proceedings. 2016;:87-90.
https://hdl.handle.net/21.15107/rcub_vinar_12470 .

Chumakov, A. N., Nikonchuk, I. S., Gaković, Biljana M., Petrović, Suzana, Trtica, Milan, "Formation of microstructures and oxides on steel surface by laser irradiation in air and liquids" in XI Belarusian-Serbian Symposium "Physics and Diagnostics of Laboratory and Astrophysical Plasmas" (РDР-11) : Proceedings (2016):87-90,
https://hdl.handle.net/21.15107/rcub_vinar_12470 .

TY  - CONF
AU  - Chumakov, A. N.
AU  - Nikonchuk, I. S.
AU  - Gaković, Biljana M.
AU  - Petrović, Suzana
AU  - Mitrić, Miodrag
AU  - Lupulescu, C.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10957
AB  - Creation of various surface structures on the laser-irradiated materials and formation of metal oxides play an important role to improve the mechanical, physical and chemical properties of materials used in different fields of industry [1-4]. Therefore, the establishment of main mechanisms and optimal regimes of laser micro and nanostructuring of materials and regularities of oxides formation is an important task. In the present study the multipulse laser irradiation (λ = 1064 nm, τ = 1 ns, f = 100÷500 Hz, q = 4.4·109 W/cm2) was used to create micro and nanostructures on the surface of high quality structural carbon steel at different conditions. Steel samples were moving along a computer given trajectory with a velocity of v = 0.2 cm/s. Steel samples were irradiated in ambient air, 3% hydrogen peroxide (H2O2) and ethanol (C2H5OH). Surface structures and composition analysis were examined by methods of optical and scanning electron microscopy. X-ray diffraction (XRD) was used to analyze a phase composition of irradiated steel samples. XRD spectra for various conditions of laser action have had different intensity profiles (peaks value, its position and width). Energydispersive X-ray spectroscopy (EDS) was used for elemental analyses. Surface structures were examined by scanning electron microscope (SEM). The detected surface structures are strongly depends on environment conditions and parameters of laser irradiation. In particular, on the surface of steel samples irradiated in the ambient air, wave structures with a period of 1 μm, irregular structures with a size of ÷22000 nm, grains with the size of 50÷200 nm, pores and irregular threadlike structures were observed. Quasiregular structures with a size of 100÷200 nm and plurality of pores with a size of 40÷600 nm were discovered on the surface of steel samples irradiated in the ethanol. On the surface of the samples irradiated in the environment of hydrogen peroxide numerous cracks and grain structures with the size of 30÷70 nm were observed. The reasons of these differences are discussed.
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  - Microstructures and oxides formation on structural steel by nanosecond laser irradiation
SP  - 188
EP  - 189
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10957
ER  - 

@conference{
author = "Chumakov, A. N. and Nikonchuk, I. S. and Gaković, Biljana M. and Petrović, Suzana and Mitrić, Miodrag and Lupulescu, C.",
year = "2015",
abstract = "Creation of various surface structures on the laser-irradiated materials and formation of metal oxides play an important role to improve the mechanical, physical and chemical properties of materials used in different fields of industry [1-4]. Therefore, the establishment of main mechanisms and optimal regimes of laser micro and nanostructuring of materials and regularities of oxides formation is an important task. In the present study the multipulse laser irradiation (λ = 1064 nm, τ = 1 ns, f = 100÷500 Hz, q = 4.4·109 W/cm2) was used to create micro and nanostructures on the surface of high quality structural carbon steel at different conditions. Steel samples were moving along a computer given trajectory with a velocity of v = 0.2 cm/s. Steel samples were irradiated in ambient air, 3% hydrogen peroxide (H2O2) and ethanol (C2H5OH). Surface structures and composition analysis were examined by methods of optical and scanning electron microscopy. X-ray diffraction (XRD) was used to analyze a phase composition of irradiated steel samples. XRD spectra for various conditions of laser action have had different intensity profiles (peaks value, its position and width). Energydispersive X-ray spectroscopy (EDS) was used for elemental analyses. Surface structures were examined by scanning electron microscope (SEM). The detected surface structures are strongly depends on environment conditions and parameters of laser irradiation. In particular, on the surface of steel samples irradiated in the ambient air, wave structures with a period of 1 μm, irregular structures with a size of ÷22000 nm, grains with the size of 50÷200 nm, pores and irregular threadlike structures were observed. Quasiregular structures with a size of 100÷200 nm and plurality of pores with a size of 40÷600 nm were discovered on the surface of steel samples irradiated in the ethanol. On the surface of the samples irradiated in the environment of hydrogen peroxide numerous cracks and grain structures with the size of 30÷70 nm were observed. The reasons of these differences are discussed.",
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 = "Microstructures and oxides formation on structural steel by nanosecond laser irradiation",
pages = "188-189",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10957"
}

Chumakov, A. N., Nikonchuk, I. S., Gaković, B. M., Petrović, S., Mitrić, M.,& Lupulescu, C.. (2015). Microstructures and oxides formation on structural steel by nanosecond laser irradiation. 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., 188-189.
https://hdl.handle.net/21.15107/rcub_vinar_10957

Chumakov AN, Nikonchuk IS, Gaković BM, Petrović S, Mitrić M, Lupulescu C. Microstructures and oxides formation on structural steel by nanosecond laser irradiation. 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;:188-189.
https://hdl.handle.net/21.15107/rcub_vinar_10957 .

Chumakov, A. N., Nikonchuk, I. S., Gaković, Biljana M., Petrović, Suzana, Mitrić, Miodrag, Lupulescu, C., "Microstructures and oxides formation on structural steel by nanosecond laser irradiation" 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):188-189,
https://hdl.handle.net/21.15107/rcub_vinar_10957 .

TY  - JOUR
AU  - Kovačević, Aleksander
AU  - Petrović, Suzana
AU  - Bokic, Bojana
AU  - Gaković, Biljana M.
AU  - Bokorov, Milos T.
AU  - Vasić, Borislav Z.
AU  - Gajic, Rados
AU  - Trtica, Milan
AU  - Jelenković, Branislav
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/323
AB  - The effects of UV femtosecond laser beam with 76 MHz repetition rate on two types of thin films on Si substrate - the Al single layer thin film, and the multilayered thin film consisted of five Al/Ti bilayers (total thickness 130 nm) - were studied. The surface modification of the target was done by low fluences and different irradiation times, not exceeding similar to 300s. Nanopatterns in the form of femtosecond-laser induced periodic surface structures (fs-LIPSS) with periodicity of LT 315 nm and height of 45 nm were registered upon irradiation of the thin films. It was shown that: (i) the fs-LIPSS evolve from ruffles similar to high spatial frequency LIPSS (HSFL) into a low spatial frequency LIPSS (LSFL) if a certain threshold of the fluence is met, (ii) the number of LSFL increases with the exposition time and (iii) the LSFL remain stable even after long exposure times. We achieved high-quality highly-controllable fabrication of periodic structures on the surface of nanosized multilayer films with high-repetition-rate low-fluence femtosecond laser pulses. Compared to the Al single layer, the presence of the Ti underlayer in the Al/Ti multilayer thin film enabled more efficient heat transmittance through the Al/Ti interface away from the interaction zone which caused the reduction of the ablation effects leading to the formation of more regular LIPSS. The different outcomes of interactions with multi and single layer thin films lead to the conclusion that the behavior of the LIPSS is due to thin film structure. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Surface nanopatterning of Al/Ti multilayer thin films and Al single layer by a low-fluence UV femtosecond laser beam
VL  - 326
SP  - 91
EP  - 98
DO  - 10.1016/j.apsusc.2014.10.180
ER  - 

@article{
author = "Kovačević, Aleksander and Petrović, Suzana and Bokic, Bojana and Gaković, Biljana M. and Bokorov, Milos T. and Vasić, Borislav Z. and Gajic, Rados and Trtica, Milan and Jelenković, Branislav",
year = "2015",
abstract = "The effects of UV femtosecond laser beam with 76 MHz repetition rate on two types of thin films on Si substrate - the Al single layer thin film, and the multilayered thin film consisted of five Al/Ti bilayers (total thickness 130 nm) - were studied. The surface modification of the target was done by low fluences and different irradiation times, not exceeding similar to 300s. Nanopatterns in the form of femtosecond-laser induced periodic surface structures (fs-LIPSS) with periodicity of LT 315 nm and height of 45 nm were registered upon irradiation of the thin films. It was shown that: (i) the fs-LIPSS evolve from ruffles similar to high spatial frequency LIPSS (HSFL) into a low spatial frequency LIPSS (LSFL) if a certain threshold of the fluence is met, (ii) the number of LSFL increases with the exposition time and (iii) the LSFL remain stable even after long exposure times. We achieved high-quality highly-controllable fabrication of periodic structures on the surface of nanosized multilayer films with high-repetition-rate low-fluence femtosecond laser pulses. Compared to the Al single layer, the presence of the Ti underlayer in the Al/Ti multilayer thin film enabled more efficient heat transmittance through the Al/Ti interface away from the interaction zone which caused the reduction of the ablation effects leading to the formation of more regular LIPSS. The different outcomes of interactions with multi and single layer thin films lead to the conclusion that the behavior of the LIPSS is due to thin film structure. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Surface nanopatterning of Al/Ti multilayer thin films and Al single layer by a low-fluence UV femtosecond laser beam",
volume = "326",
pages = "91-98",
doi = "10.1016/j.apsusc.2014.10.180"
}

Kovačević, A., Petrović, S., Bokic, B., Gaković, B. M., Bokorov, M. T., Vasić, B. Z., Gajic, R., Trtica, M.,& Jelenković, B.. (2015). Surface nanopatterning of Al/Ti multilayer thin films and Al single layer by a low-fluence UV femtosecond laser beam. in Applied Surface Science, 326, 91-98.
https://doi.org/10.1016/j.apsusc.2014.10.180

Kovačević A, Petrović S, Bokic B, Gaković BM, Bokorov MT, Vasić BZ, Gajic R, Trtica M, Jelenković B. Surface nanopatterning of Al/Ti multilayer thin films and Al single layer by a low-fluence UV femtosecond laser beam. in Applied Surface Science. 2015;326:91-98.
doi:10.1016/j.apsusc.2014.10.180 .

Kovačević, Aleksander, Petrović, Suzana, Bokic, Bojana, Gaković, Biljana M., Bokorov, Milos T., Vasić, Borislav Z., Gajic, Rados, Trtica, Milan, Jelenković, Branislav, "Surface nanopatterning of Al/Ti multilayer thin films and Al single layer by a low-fluence UV femtosecond laser beam" in Applied Surface Science, 326 (2015):91-98,
https://doi.org/10.1016/j.apsusc.2014.10.180 . .

TY  - JOUR
AU  - Chumakov, A. N.
AU  - Nikonchuk, I. S.
AU  - Gaković, Biljana M.
AU  - Petrović, Suzana
AU  - Trtica, Milan
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7057
AB  - Results of surface modification are presented for MnNiCrMo-steel samples exposed to a Nd:YAG laser operating in a pulse-periodic mode (10 Hz frequency, 532 nm wavelength and 17 ns pulse duration). The steel samples were irradiated in air by a series of laser pulses at a fluence of 10.7 J cm(-2) close to a plasma formation threshold. Surface structures were examined by optical, scanning electron and confocal optical microscopy. The appearance of the detected surface structures strongly depends on the number of laser pulses and power density of laser radiation. Significant differences were found between laser-induced structures in the center of the laser spot, at its edges and in the nearest surrounding of the laser spot. The reasons for such differences are discussed.
T2  - Physica Scripta
T1  - Multipulse nanosecond laser modification of steel surface
VL  - T162
DO  - 10.1088/0031-8949/2014/T162/014016
ER  - 

@article{
author = "Chumakov, A. N. and Nikonchuk, I. S. and Gaković, Biljana M. and Petrović, Suzana and Trtica, Milan",
year = "2014",
abstract = "Results of surface modification are presented for MnNiCrMo-steel samples exposed to a Nd:YAG laser operating in a pulse-periodic mode (10 Hz frequency, 532 nm wavelength and 17 ns pulse duration). The steel samples were irradiated in air by a series of laser pulses at a fluence of 10.7 J cm(-2) close to a plasma formation threshold. Surface structures were examined by optical, scanning electron and confocal optical microscopy. The appearance of the detected surface structures strongly depends on the number of laser pulses and power density of laser radiation. Significant differences were found between laser-induced structures in the center of the laser spot, at its edges and in the nearest surrounding of the laser spot. The reasons for such differences are discussed.",
journal = "Physica Scripta",
title = "Multipulse nanosecond laser modification of steel surface",
volume = "T162",
doi = "10.1088/0031-8949/2014/T162/014016"
}

Chumakov, A. N., Nikonchuk, I. S., Gaković, B. M., Petrović, S.,& Trtica, M.. (2014). Multipulse nanosecond laser modification of steel surface. in Physica Scripta, T162.
https://doi.org/10.1088/0031-8949/2014/T162/014016

Chumakov AN, Nikonchuk IS, Gaković BM, Petrović S, Trtica M. Multipulse nanosecond laser modification of steel surface. in Physica Scripta. 2014;T162.
doi:10.1088/0031-8949/2014/T162/014016 .

Chumakov, A. N., Nikonchuk, I. S., Gaković, Biljana M., Petrović, Suzana, Trtica, Milan, "Multipulse nanosecond laser modification of steel surface" in Physica Scripta, T162 (2014),
https://doi.org/10.1088/0031-8949/2014/T162/014016 . .

TY  - JOUR
AU  - Milovanović, Dubravka S.
AU  - Gaković, Biljana M.
AU  - Radu, C.
AU  - Zamfirescu, M.
AU  - Radak, Bojan
AU  - Petrović, Suzana
AU  - Rogić Miladinović, Zorana
AU  - Mihailescu, Ion N.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7058
AB  - In this work, we present the results obtained by femtosecond laser processing of AISI D2 steel and the widely applicable titanium-based alloy, Ti6Al4V. Patterning the materials surfaces was done by a Ti: sapphire system at 775 nm wavelength and 200 fs pulse duration, while varying the output pulse energies and the scanning speed. The formation of laser-induced periodical surface structures were found for both materials.
T2  - Physica Scripta
T1  - Femtosecond laser surface patterning of steel and titanium alloy
VL  - T162
DO  - 10.1088/0031-8949/2014/T162/014017
ER  - 

@article{
author = "Milovanović, Dubravka S. and Gaković, Biljana M. and Radu, C. and Zamfirescu, M. and Radak, Bojan and Petrović, Suzana and Rogić Miladinović, Zorana and Mihailescu, Ion N.",
year = "2014",
abstract = "In this work, we present the results obtained by femtosecond laser processing of AISI D2 steel and the widely applicable titanium-based alloy, Ti6Al4V. Patterning the materials surfaces was done by a Ti: sapphire system at 775 nm wavelength and 200 fs pulse duration, while varying the output pulse energies and the scanning speed. The formation of laser-induced periodical surface structures were found for both materials.",
journal = "Physica Scripta",
title = "Femtosecond laser surface patterning of steel and titanium alloy",
volume = "T162",
doi = "10.1088/0031-8949/2014/T162/014017"
}

Milovanović, D. S., Gaković, B. M., Radu, C., Zamfirescu, M., Radak, B., Petrović, S., Rogić Miladinović, Z.,& Mihailescu, I. N.. (2014). Femtosecond laser surface patterning of steel and titanium alloy. in Physica Scripta, T162.
https://doi.org/10.1088/0031-8949/2014/T162/014017

Milovanović DS, Gaković BM, Radu C, Zamfirescu M, Radak B, Petrović S, Rogić Miladinović Z, Mihailescu IN. Femtosecond laser surface patterning of steel and titanium alloy. in Physica Scripta. 2014;T162.
doi:10.1088/0031-8949/2014/T162/014017 .

Milovanović, Dubravka S., Gaković, Biljana M., Radu, C., Zamfirescu, M., Radak, Bojan, Petrović, Suzana, Rogić Miladinović, Zorana, Mihailescu, Ion N., "Femtosecond laser surface patterning of steel and titanium alloy" in Physica Scripta, T162 (2014),
https://doi.org/10.1088/0031-8949/2014/T162/014017 . .

TY  - JOUR
AU  - Chumakov, A. N.
AU  - Nikonchuk, Irina S.
AU  - Gaković, Biljana M.
AU  - Petrović, Suzana
AU  - Mitrić, Miodrag
AU  - Lupulescu, C.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10958
AB  - Results of laser-induced oxidation (100−500 Hz frequency, 1064 nm wavelength, and 1 ns pulse duration) and formation of micro- and nanostructures on the surface of high-quality structural carbon steel (0.42 wt.% C, 0.5 wt.% Mn, 0.25 wt.% Cr) are presented. The steel samples were irradiated in ambient air, water, 3% hydrogen peroxide, and ethanol by a series of laser pulses at a power density of (3.2−4.4)·109 W/cm2, which is close to the ablation threshold. The surface structures were examined by optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and Raman spectroscopy. Different kinds of structures detected on the steel surface and the efficiency of oxide formation depend strongly on both the liquid or gaseous environments and the parameters of laser treatment. It was found that the efficiency of nano/microstructures and oxides formation on structural steel is especially expressed for samples irradiated in air and hydrogen peroxide environments.
T2  - High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
T1  - Formation of microstructures and oxides on structural steel by nanosecond laser irradiation
VL  - 18
IS  - 3
DO  - 10.1615/hightempmatproc.2015015600
ER  - 

@article{
author = "Chumakov, A. N. and Nikonchuk, Irina S. and Gaković, Biljana M. and Petrović, Suzana and Mitrić, Miodrag and Lupulescu, C.",
year = "2014",
abstract = "Results of laser-induced oxidation (100−500 Hz frequency, 1064 nm wavelength, and 1 ns pulse duration) and formation of micro- and nanostructures on the surface of high-quality structural carbon steel (0.42 wt.% C, 0.5 wt.% Mn, 0.25 wt.% Cr) are presented. The steel samples were irradiated in ambient air, water, 3% hydrogen peroxide, and ethanol by a series of laser pulses at a power density of (3.2−4.4)·109 W/cm2, which is close to the ablation threshold. The surface structures were examined by optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and Raman spectroscopy. Different kinds of structures detected on the steel surface and the efficiency of oxide formation depend strongly on both the liquid or gaseous environments and the parameters of laser treatment. It was found that the efficiency of nano/microstructures and oxides formation on structural steel is especially expressed for samples irradiated in air and hydrogen peroxide environments.",
journal = "High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes",
title = "Formation of microstructures and oxides on structural steel by nanosecond laser irradiation",
volume = "18",
number = "3",
doi = "10.1615/hightempmatproc.2015015600"
}

Chumakov, A. N., Nikonchuk, I. S., Gaković, B. M., Petrović, S., Mitrić, M.,& Lupulescu, C.. (2014). Formation of microstructures and oxides on structural steel by nanosecond laser irradiation. in High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, 18(3).
https://doi.org/10.1615/hightempmatproc.2015015600

Chumakov AN, Nikonchuk IS, Gaković BM, Petrović S, Mitrić M, Lupulescu C. Formation of microstructures and oxides on structural steel by nanosecond laser irradiation. in High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes. 2014;18(3).
doi:10.1615/hightempmatproc.2015015600 .

Chumakov, A. N., Nikonchuk, Irina S., Gaković, Biljana M., Petrović, Suzana, Mitrić, Miodrag, Lupulescu, C., "Formation of microstructures and oxides on structural steel by nanosecond laser irradiation" in High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, 18, no. 3 (2014),
https://doi.org/10.1615/hightempmatproc.2015015600 . .

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  - Peruško, Davor
AU  - Kovač, Janez
AU  - Siketic, Z.
AU  - Bogdanović-Radović, Ivančica
AU  - Gaković, Biljana M.
AU  - Radak, Bojan
AU  - Trtica, Milan
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5842
AB  - The surface oxidation of Ni/Ti bilayer, deposited on silicon substrate, affected by picosecond Nd: YAG laser radiation has been investigated. Fluence close to the target ablation threshold and multi-pulse laser irradiation regime were applied. Changes in the chemical composition of the formed surface oxide layer were studied by Elastic Recoil Detection Analysis (ERDA) and X-ray photoelectron spectroscopy (XPS). Morphological features analysis, at the oxide surface layer, was monitored, too. Laser modification as-deposited (Ni/Ti)/Si sample with 10 pulses induces a progressed interaction between Ni and Ti layers with the initial surface oxidation and formation of NiTi alloy phase. Progressed intermixing of components was achieved for the irradiation with 50 and more pulses, when all components were quite uniformly distributed to a depth of about 80 nm. An oxide layer was formed at the surface, with the specific combination of the oxide phases depending on the number of accumulated pulses. Changes in the morphological characteristics are reflected in the increase of the mean surface roughness and the generation of a certain number of cavities. These features are decreased with increasing number of pulses, caused by the surface melting and a pronounced mobility of the materials. (C) 2013 Elsevier B.V. All rights reserved.
T2  - Materials Chemistry and Physics
T1  - Laser-induced surface oxidation of (Ni/Ti)/Si system with picosecond laser pulses
VL  - 143
IS  - 2
SP  - 530
EP  - 535
DO  - 10.1016/j.matchemphys.2013.09.021
ER  - 

@article{
author = "Petrović, Suzana and Peruško, Davor and Kovač, Janez and Siketic, Z. and Bogdanović-Radović, Ivančica and Gaković, Biljana M. and Radak, Bojan and Trtica, Milan",
year = "2014",
abstract = "The surface oxidation of Ni/Ti bilayer, deposited on silicon substrate, affected by picosecond Nd: YAG laser radiation has been investigated. Fluence close to the target ablation threshold and multi-pulse laser irradiation regime were applied. Changes in the chemical composition of the formed surface oxide layer were studied by Elastic Recoil Detection Analysis (ERDA) and X-ray photoelectron spectroscopy (XPS). Morphological features analysis, at the oxide surface layer, was monitored, too. Laser modification as-deposited (Ni/Ti)/Si sample with 10 pulses induces a progressed interaction between Ni and Ti layers with the initial surface oxidation and formation of NiTi alloy phase. Progressed intermixing of components was achieved for the irradiation with 50 and more pulses, when all components were quite uniformly distributed to a depth of about 80 nm. An oxide layer was formed at the surface, with the specific combination of the oxide phases depending on the number of accumulated pulses. Changes in the morphological characteristics are reflected in the increase of the mean surface roughness and the generation of a certain number of cavities. These features are decreased with increasing number of pulses, caused by the surface melting and a pronounced mobility of the materials. (C) 2013 Elsevier B.V. All rights reserved.",
journal = "Materials Chemistry and Physics",
title = "Laser-induced surface oxidation of (Ni/Ti)/Si system with picosecond laser pulses",
volume = "143",
number = "2",
pages = "530-535",
doi = "10.1016/j.matchemphys.2013.09.021"
}

Petrović, S., Peruško, D., Kovač, J., Siketic, Z., Bogdanović-Radović, I., Gaković, B. M., Radak, B.,& Trtica, M.. (2014). Laser-induced surface oxidation of (Ni/Ti)/Si system with picosecond laser pulses. in Materials Chemistry and Physics, 143(2), 530-535.
https://doi.org/10.1016/j.matchemphys.2013.09.021

Petrović S, Peruško D, Kovač J, Siketic Z, Bogdanović-Radović I, Gaković BM, Radak B, Trtica M. Laser-induced surface oxidation of (Ni/Ti)/Si system with picosecond laser pulses. in Materials Chemistry and Physics. 2014;143(2):530-535.
doi:10.1016/j.matchemphys.2013.09.021 .

Petrović, Suzana, Peruško, Davor, Kovač, Janez, Siketic, Z., Bogdanović-Radović, Ivančica, Gaković, Biljana M., Radak, Bojan, Trtica, Milan, "Laser-induced surface oxidation of (Ni/Ti)/Si system with picosecond laser pulses" in Materials Chemistry and Physics, 143, no. 2 (2014):530-535,
https://doi.org/10.1016/j.matchemphys.2013.09.021 . .

TY  - JOUR
AU  - Trtica, Milan
AU  - Batani, Dimitri
AU  - Redaelli, R.
AU  - Limpouch, Jiri
AU  - Kmetik, V.
AU  - Ciganović, Jovan
AU  - Stašić, Jelena
AU  - Gaković, Biljana M.
AU  - Momčilović, Miloš
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5339
AB  - The response of titanium surface irradiated with high intensity (10(13) - 10(15) W/cm(2)) Ti:sapphire laser was studied in vacuum. Most of the reported investigations were conducted with nano- to femtosecond lasers in gas atmospheres while the studies of titanium surface interacting with femtosecond laser in vacuum are scarce. The laser employed in our experiment was operating at 800 nm wavelength and pulse duration of 60 fs in single pulse regime. The observed surface changes and phenomena are (1) creation of craters, (2) formation of periodic surface structures at the reduced intensity, and (3) occurrence of plasma in front the target. Since microstructuring of titanium is very interesting in many areas (industry, medicine), it can be concluded from this study that the reported laser intensities can effectively be applied for micromachining of the titanium surface (increasing the roughness, formation of parallel periodic surface structures etc.).
T2  - Laser and Particle Beams
T1  - Titanium surface modification using femtosecond laser with 10(13)-10(15) W/cm(2) intensity in vacuum
VL  - 31
IS  - 1
SP  - 29
EP  - 36
DO  - 10.1017/S0263034612000924
ER  - 

@article{
author = "Trtica, Milan and Batani, Dimitri and Redaelli, R. and Limpouch, Jiri and Kmetik, V. and Ciganović, Jovan and Stašić, Jelena and Gaković, Biljana M. and Momčilović, Miloš",
year = "2013",
abstract = "The response of titanium surface irradiated with high intensity (10(13) - 10(15) W/cm(2)) Ti:sapphire laser was studied in vacuum. Most of the reported investigations were conducted with nano- to femtosecond lasers in gas atmospheres while the studies of titanium surface interacting with femtosecond laser in vacuum are scarce. The laser employed in our experiment was operating at 800 nm wavelength and pulse duration of 60 fs in single pulse regime. The observed surface changes and phenomena are (1) creation of craters, (2) formation of periodic surface structures at the reduced intensity, and (3) occurrence of plasma in front the target. Since microstructuring of titanium is very interesting in many areas (industry, medicine), it can be concluded from this study that the reported laser intensities can effectively be applied for micromachining of the titanium surface (increasing the roughness, formation of parallel periodic surface structures etc.).",
journal = "Laser and Particle Beams",
title = "Titanium surface modification using femtosecond laser with 10(13)-10(15) W/cm(2) intensity in vacuum",
volume = "31",
number = "1",
pages = "29-36",
doi = "10.1017/S0263034612000924"
}

Trtica, M., Batani, D., Redaelli, R., Limpouch, J., Kmetik, V., Ciganović, J., Stašić, J., Gaković, B. M.,& Momčilović, M.. (2013). Titanium surface modification using femtosecond laser with 10(13)-10(15) W/cm(2) intensity in vacuum. in Laser and Particle Beams, 31(1), 29-36.
https://doi.org/10.1017/S0263034612000924

Trtica M, Batani D, Redaelli R, Limpouch J, Kmetik V, Ciganović J, Stašić J, Gaković BM, Momčilović M. Titanium surface modification using femtosecond laser with 10(13)-10(15) W/cm(2) intensity in vacuum. in Laser and Particle Beams. 2013;31(1):29-36.
doi:10.1017/S0263034612000924 .

Trtica, Milan, Batani, Dimitri, Redaelli, R., Limpouch, Jiri, Kmetik, V., Ciganović, Jovan, Stašić, Jelena, Gaković, Biljana M., Momčilović, Miloš, "Titanium surface modification using femtosecond laser with 10(13)-10(15) W/cm(2) intensity in vacuum" in Laser and Particle Beams, 31, no. 1 (2013):29-36,
https://doi.org/10.1017/S0263034612000924 . .