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

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

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

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

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

TY  - 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 .