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334 results on '"Veiko Vadim"'

53. Numerical Investigation of Ultrashort Laser-Ablative Synthesis of Metal Nanoparticles in Liquids Using the Atomistic-Continuum Model

Author

Ivanov, Dmitry S., primary, Izgin, Thomas, additional, Maiorov, Alexey N., additional, Veiko, Vadim P., additional, Rethfeld, Baerbel, additional, Dombrovska, Yaroslava I., additional, Garcia, Martin E., additional, Zavestovskaya, Irina N., additional, Klimentov, Sergey M., additional, and Kabashin, Andrei V., additional

Published
2019
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66. Thermochemical writing with high spatial resolution on Ti films utilising picosecond laser

Author

Veiko, Vadim P., primary, Zakoldaev, Roman A., additional, Shakhno, Elena A., additional, Sinev, Dmitry A., additional, Nguyen, Zung K., additional, Baranov, Alexander V., additional, Bogdanov, Kirill V., additional, Gedvilas, Mindaugas, additional, Račiukaitis, Gediminas, additional, Vishnevskaya, Lidiya V., additional, and Degtyareva, Elena N., additional

Published
2019
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72. Insights into Ultrashort Laser-Driven Au:TiO2Nanocomposite Formation

Author

Andreeva, Yaroslava, Sharma, Nipun, Rudenko, Anton, Mikhailova, Julia, Sergeev, Maksim, Veiko, Vadim P., Vocanson, Francis, Lefkir, Yaya, Destouches, Nathalie, and Itina, Tatiana E.

Abstract

Modern methods of laser-based nanocomposite fabrication and treatment rely on a deep understanding of the interplay between a set of mechanisms involved, such as nanoparticle growth and decay, material phase transformation, degradation, and damage. In this work, scanning multipulse femtosecond laser irradiation is used for Au:TiO2nanocomposite formation. Depending on laser scan speed, two different regimes are observed revealing different gold nanoparticle growth rates. The regime of the remarkably fast laser-induced growth of Au nanoparticles is found to be accompanied by the cavity formation in titania film around the particles. The transition between two formation regimes is found to be abrupt, confirming the catastrophic mechanism of Au nanoparticle growth. The obtained results are analyzed based on the developed numerical model including effects such as nanoparticle absorption, local field enhancement, photoinduced free carrier generation, plasmon-assisted electron emission, and thermal heat transfer from nanoparticles toward titania matrix. Our modeling reveals the crucial role of collective thermoplasmonic effects caused namely by bimodal nanoparticle size distribution. The performed analysis also suggests that spall in the solid state is responsible for final matrix degradation if nanoparticles become large enough. The considered laser-based formation of optical nanocomposites is crucial not only for the better understanding of ultrashort laser interactions with glass–metallic nanocomposite materials but also for numerous applications in photocatalysts, solar cells, and chemosensors.

Published
2020
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73. Fluid Cells Fabrication in Sol-Gel and Porous Glass.

Author

Andreeva, Yaroslava M., Sergeev, Maksim M., Zakoldaev, Roman A., Gabysheva, Uliana E., Veiko, Vadim P., Yakovlev, Evgeniy B., Kudryashov, Sergey I., Danilov, Pavel A., Ionin, Andrey A., Vocanson, Francis, Itina, Tatiana E., Antropova, Tatiana V., and Medvedev, Oleg S.

Subjects
THIN films, RHODAMINES, PERMEABILITY, POROUS materials, FEMTOSECOND lasers
Abstract

We investigate laser treatment regimes suitable for the fabrication of the isolated cells in a porous silica glass and a sol-gel film. Three-dimensional structures are produced as a result of the porous glass densification induced by femtosecond laser pulses. We also demonstrate that CO2 laser can be used to form such structures in the sol-gel film deposited on the glass. In the porous glass, barriers with various permeability were created, which were used as walls in fluid cells. Laserinduced microrelief formation on the surface of the sol-gel film provides isolation for the separated porous cells. The impermeability of porous cells is tested by impregnation them with different dyes (rhodamine 6G, fuchsine, etc.). [ABSTRACT FROM AUTHOR]

Published
2018
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76. On the role of nanopore formation and evolution in multi-pulse laser nanostructuring of glasses.

Author

Rudenko, Anton, Ma, Hongfeng, Veiko, Vadim P., Colombier, Jean-Philippe, and Itina, Tatiana E.

Subjects
NANOPORES, NANOSTRUCTURED materials, CAVITATION, HYDRODYNAMICS, IRRADIATION
Abstract

Laser nanostructuring of glasses has attracted particular attention during laser decades due to its numerous applications in optics, telecommunications, sensing, nanofluidics, as well as in the development of nanocomposite materials. Despite a significant progress achieved in this field with the development and use of femtosecond laser systems, many questions remain puzzling. This study is focused on the numerical modeling of ultrashort laser interactions with glasses. Firstly, we consider laser light propagation and nonlinear ionization. Then, nanocavitation processes in glasses are modeled, followed by the hydrodynamic evolution of pores and cavities. The required conditions for nanopore formation and volume nanogratings erasure in the typical femtosecond laser-irradiation regimes are discussed in the frame of the developed model. [ABSTRACT FROM AUTHOR]

Published
2018
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77. Fast Fabrication of Multilevel Phase Plates Used for Laser Beam Correction.

Author

Zakoldaev, Roman, Kostyuk, Galina, Rymkevich, Vladimir, Koval, Vladislav, Sergeev, Maksim, Veiko, Vadim, Yakovlev, Evgeny, and Sivers, Aleksandr

Subjects
LASER beams, PLATES (Engineering) design & construction, INDUSTRIAL lasers
Abstract

Local spatial and temporal control of laser-induced microplasma (LIMP) allows to form a microrelief on fused silica plates for the fabrication of multilevel phase elements. In this work we suggested the optimal way for precision depth variation (up to 50 nm) of the microrelief (0.05 - 15 μm) on fused silica surface. New software and hardware were developed for the automation of optical phase elements calculation and its fabrication by LIMP. A few types of multilevel random phase plates were experimentally realized. The fabricated elements were successfully tested in the optical scheme for the correction of the highly coherent laser beam. The comparative analysis of binary and discrete phase plates was accomplished. [ABSTRACT FROM AUTHOR]

Published
2017
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81. Influence of Pulsed Fiber Laser Radiation on Surface Morphology and Electrical Properties of Si/SiO2 Structure.

Author

Polyakov, Dmitry, Skvortsov, Albert, and Veiko, Vadim

Subjects
FIBER lasers, LASER beams, SURFACE morphology, ELECTRIC properties of silica, MICROSTRUCTURE, CAPACITANCE-voltage characteristics
Abstract

The regularities of microrelief formation on the surface of Si/SiO2 structure under the action of pulsed fiber laser radiation with intensity lower than SiO2 damage threshold are studied. Obtained surface morphology modification accompanied with changes in capacitance-voltage characteristics of modified area. [ABSTRACT FROM AUTHOR]

Published
2015
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84. Laser-induced Black-body Heating (LIBBH) as a Method for Glass Surface Modification.

Author

Zakoldaev, Roman, Sergeev, Maksim, Kostyuk, Galina, and Veiko, Vadim

Subjects
LASER photochemistry, BLACK body (Physics), HEATING, LASER beams, WAVELENGTHS, POROUS materials
Abstract

The technique for laser-assisted modification of glass surface is suggested. The method is based on the heating of glass by graphite plate irradiated by laser being in direct contact with the glass surface from the backside. Transparency of glass and strong absorption of graphite for an incident laser radiation provide the diversity of applicable lasers wavelength and pulse duration. In our case, the pulsed fiber NIR laser was used. The surface densification of porous glass as well as creation of various micro-optical elements on the quartz glass surface are reported. [ABSTRACT FROM AUTHOR]

Published
2015
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