Prof. Yuri E. Geints Profile

Prof. Yuri E. Geints

at VE Zuev Institute of Atmospheric Optics

SPIE Involvement:

Author

Publications (47)

Proceedings Article | 12 November 2020 Paper

Characteristics of the energy-replenishing diffraction-ray tube at the postfilamentation stage of the propagation of femtosecond laser pulses in the air

Yu. Geints, A. Zemlyanov, O. Minina

Proc. SPIE. 11560, 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics

KEYWORDS: Femtosecond phenomena, Atmospheric propagation, Chromium, Pulsed laser operation, Diffraction, Laser beam propagation, Gaussian beams, Atmospheric optics, Numerical simulations, Wave propagation

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Proceedings Article | 12 November 2020 Paper

Numerical investigation of laser light scattering by dielectric microtoroids

Yury Geints, Ekaterina Panina, Alexander Zemlyanov, Inna Apeximova

Proc. SPIE. 11560, 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics

KEYWORDS: Particles, Near field optics, Dielectrics, Light scattering, Scattering, Photonic nanostructures, Silicon, Glasses, Near field

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Proceedings Article | 12 November 2020 Paper

Effective dispersion length during the propagation of powerful femtosecond laser pulses in the air

Yu. Geints, A. Zemlyanov, O. Minina

Proc. SPIE. 11560, 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics

KEYWORDS: Dispersion, Femtosecond phenomena, Atmospheric propagation, Diffraction, Numerical analysis, Light wave propagation

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Proceedings Article | 20 September 2020 Presentation + Paper

Filaments and post-filaments formation during high-power Ti:sapphire laser pulses propagation in air and optical glasses

Yuri Geints, Andrey Ionin, Daria Mokrousova, Georgy Rizaev, Leonid Seleznev, Elena Sunchugasheva, Alexander Zemlyanov

Proc. SPIE. 11539, Technologies for Optical Countermeasures XVII; and High-Power Lasers: Technology and Systems, Platforms, Effects IV

KEYWORDS: Glasses, Laser beam propagation, High power lasers, Ultrafast phenomena, Phase modulation, Nonlinear optics, Solids, Dielectrics, Pulsed laser operation, Laser energy

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Proceedings Article | 1 April 2020 Presentation + Paper

Tailoring light absorption of plasmonic-doped spherical dielectric microcapsule

Yury Geints, Ekaterina Panina, Alexander Zemlyanov

Proc. SPIE. 11368, Photonics and Plasmonics at the Mesoscale

KEYWORDS: Absorption, Nanoparticles, Gold, Spherical lenses, Particles, Optical spheres, Metals, Plasmons, Nanorods, Finite-difference time-domain method

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We report the study of light absorption efficiency of a hollow spherical microparticle (microcapsule) doped with strongly absorbing gold nanoparticles of spherical and cylindrical spatial shapes. By means of the FDTD numerical simulations, the absorption spectra of a doped microcapsule in the visible and near-IR spectral regions (from 0.5 μm to 0.9 μm) are calculated. Based on the research results we can draw the several conclusions. First, the absorption efficiency of initially transparent spherical microcapsule is effectively tailored by doping the necessary amount of strongly absorbing nanometersized metal (gold) particles. Meanwhile, with a rather low volume fraction of nano-inclusions in the capsule shell (~ 18%) it is possible to rise its absorption cross-section to the value of an absolutely absorbing sphere. Next, the spectral absorption of a microcapsule turns out to be quite non-uniform in the considered wavelength range of incident radiation and depends on the morphology of nano-inclusions. In some spectral regions, substantial capsule absorption enhancement is realized due to the resonant excitation of surface plasmons in nanoparticles (from 540 nm to 570 nm for spheres, from 670 nm to 770 nm for rods of various form factors). In the long-wavelength wing of the spectrum, the efficiency of absorption of a nanoparticle-doped capsule as a rule decreases due to its Mie-parameter decrease and a drop in the absorption coefficient of bulk gold. The chromatic dispersion of microcapsule absorption decreases with the increasing of volume content of plasmonic nanoparticles. By simultaneous combining gold nanoparticles of various shapes (spheres and rods), it is possible to obtain a quasi-neutral absorption of composite capsule in the considered wavelength range. Finally, the absorptivity of a nanoparticle-doped microcapsule can be calculated using the effective homogenized medium formulae mainly in the conditions of weak chromatic dispersion of capsule absorption. This situation is usually realized with cylinder-shaped nano-inclusions or at high levels of total shell absorption. Besides, the Bruggeman mixing rule does not capture the surface plasmon resonances of nanoparticle-dope.

Proceedings Article | 18 December 2019 Paper

Investigation of multiple filamentation of high power laser radiation in air with a deformable mirror

D. Apeksimov, Yu. Geints, A. Zemlyanov, A. Iglakova, A. Kabanov, O. Kuchinskaya, G. Matvienko, V. Oshlakov, A. Petrov

Proc. SPIE. 11208, 25th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

KEYWORDS: Deformable mirrors, Atmospheric propagation, Wavefronts, Femtosecond phenomena

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Proceedings Article | 18 December 2019 Paper

Features of light absorption by the dimer of microcapsules

Yury Geints, Ekaterina Panina, Dmitry Apeximov, Anna Afonasenko

Proc. SPIE. 11208, 25th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

KEYWORDS: Particles, Absorption, Numerical simulations, Polymers, Spherical lenses, Dielectrics, Liquids, Oxides, Titanium dioxide, Gold

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Proceedings Article | 13 December 2018 Paper

Long-range filaments producing upon ultrashort mid-IR laser pulses train filamentation in air: numerical simulations

Yurii Geints, Alexander Zemlyanov

Proc. SPIE. 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

KEYWORDS: Plasma, Ionization, Pulsed laser operation, Gas lasers, Picosecond phenomena, Numerical simulations, Molecules, Mid-IR, Wave propagation, Atmospheric optics

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Proceedings Article | 13 December 2018 Paper

Comparative analysis of key parameters of "photonic nanojets" from axisymmetric nonspherical microparticles

Yurii Geints, Ekaterina Panina, Alexander Zemlyanov

Proc. SPIE. 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

KEYWORDS: Particles, Axicons, Near field optics, Composites, Photonic nanostructures, Spherical lenses, Scattering, Light scattering, Optical spheres, Dielectrics

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Proceedings Article | 16 April 2018 Paper

Peculiarities of light absorption by spherical microcapsules

Yurii Geints, Ekaterina Panina, Alexander Zemlyanov

Proc. SPIE. 10614, International Conference on Atomic and Molecular Pulsed Lasers XIII

KEYWORDS: Particles, Absorption, Spherical lenses, Coating, Finite-difference time-domain method, Optical properties, Refractive index, Titanium dioxide, Polymers, Optical spheres

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Proceedings Article | 13 January 2017 Paper

Post-filamentation high-intensive light channels formation upon ultrashort laser pulses self-focusing in air

Yu. Geints, A. Ionin, D. Mokrousova, L. Seleznev, D. Sinitsyn, E. Sunchugasheva, A. Zemlyanov

Proc. SPIE. 10254, XXI International Symposium on High Power Laser Systems and Applications 2016

KEYWORDS: Ultrafast phenomena, Plasma, Pulsed laser operation, Diffraction, High power lasers, Laser energy, Mirrors, Atmospheric propagation, Nonlinear optics, Attenuators

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Proceedings Article | 21 October 2016 Paper

Remote sensing for oil products on water surface via fluorescence induced by UV filaments

E. Sunchugasheva, A. Ionin, D. Mokrousova, L. Seleznev, D. Sinitsyn, Yu. Geints, A. Zemlyanov

Proc. SPIE. 9988, Electro-Optical Remote Sensing X

KEYWORDS: Luminescence, Ultraviolet radiation, Pulsed laser operation, Wave propagation, Laser beam propagation, Spatial resolution, Femtosecond phenomena, Spectroscopy, Laser energy, Laser scattering

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Proceedings Article | 19 November 2015 Paper

Characteristics of photonic nanojets from dielectric microparticles of various spatial shapes

Yurii Geints, Ekaterina Panina, Alexander Zemlyanov

Proc. SPIE. 9680, 21st International Symposium Atmospheric and Ocean Optics: Atmospheric Physics

KEYWORDS: Particles, Near field optics, Scattering, Dielectrics, Ocean optics, Quartz, Photonic nanostructures, Spherical lenses, Axicons, Near field

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Proceedings Article | 19 November 2015 Paper

Influence of the spatial shape of nonspherical symmetric dielectric microparticles on morphology of photonic jets

Yurii Geints, Ekaterina Panina, Alexander Zemlyanov

Proc. SPIE. 9680, 21st International Symposium Atmospheric and Ocean Optics: Atmospheric Physics

KEYWORDS: Particles, Composites, Scattering, Dielectrics, Spherical lenses, Light scattering, Axicons, Optical components, Near field optics, Ocean optics

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Proceedings Article | 19 November 2015 Paper

Modeling of multiple filamentation of terawatt laser pulses on a hundred-meter air path

D. Apeksimov, Yu. Geints, A. Zemlyanov, A. Iglakova, A. Kabanov, O. Kuchinskaya, G. Matvienko, V. Oshlakov, A. Petrov

Proc. SPIE. 9680, 21st International Symposium Atmospheric and Ocean Optics: Atmospheric Physics

KEYWORDS: Plasma, Collimation, Pulsed laser operation, Telescopes, Numerical simulations, Nonlinear optics, Atmospheric propagation, Ultrafast phenomena, Photography, Ionization

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Proceedings Article | 25 November 2014 Paper

Propagation focus repetitively pulsed laser radiation in gas-aerosol atmosphere

A. Ponomarenko, G. Grachev, A. Zemlyanov, A. Pavlov, V. Tischenko, A. Kabanov, V. Pogodaev, J. Geynts, A. Smirnov, A. Petrov, P. Pinaev, P. Statsenko

Proc. SPIE. 9292, 20th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

KEYWORDS: Atmospheric propagation, Absorption, Pulsed laser operation, Carbon dioxide lasers, Carbon dioxide, Atmospheric optics, Aerosols, Atmospheric physics, Ocean optics, Mirrors

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Proceedings Article | 25 November 2014 Paper

Extremal localization of optical field near surface of spherical dielectric microparticles

Yurii Geints, Alexander Zemlyanov, Ekaterina Panina

Proc. SPIE. 9292, 20th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

KEYWORDS: Particles, Spherical lenses, Pulsed laser operation, Dielectrics, Scattering, Diffraction, Laser scattering, Ocean optics, Quartz, Optical spheres

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Proceedings Article | 25 November 2014 Paper

Formation of "photonic jet" upon irradiation of spherical microparticles by a focused laser beam

Yurii Geints, Alexander Zemlyanov, Ekaterina Panina

Proc. SPIE. 9292, 20th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

KEYWORDS: Particles, Spherical lenses, Optical spheres, Diffraction, Ocean optics, Photonic nanostructures, Dielectrics, Mie scattering, Near field optics, Atmospheric optics

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Proceedings Article | 11 February 2009 Paper

Efficient excitation of whispering gallery modes in a spherical particle illuminated by an ultrashort amplitude-modulated Gaussian laser beam

Yu. Geints, A. Zemlyanov, E. Panina

Proc. SPIE. 7296, Fifteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics

KEYWORDS: Particles, Spherical lenses, Scattering, Mie scattering, Water, Light scattering, Laser scattering, Gaussian beams, Frequency modulation, Dielectrics

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Proceedings Article | 21 April 2008 Paper

Frequency-pulsed regime of excitation of spherical microcavity by chirp ultra-short laser radiation

D. Apeksimov, Yu. Geints, A. Zemlyanov

Proc. SPIE. 6936, Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics

KEYWORDS: Particles, Spherical lenses, Optical microcavities, Frequency modulation, Atmospheric optics, Pulsed laser operation, Ocean optics, Optical components, Resonators, Modulation

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Proceedings Article | 14 February 2008 Paper

Two-photon induced fluorescence of organic molecules in microcavity

Elena Bykova, Alexander Zemlyanov, Yuri Geints

Proc. SPIE. 6936, Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics

KEYWORDS: Molecules, Luminescence, Atmospheric particles, Optical microcavities, Spherical lenses, Absorption, Resonators, Particles, Dielectric polarization, Molecular lasers

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Proceedings Article | 14 February 2008 Paper

Multiphoton excitation of fluorescence in spherical particles: angular distribution of scattered radiation

Alexander Zemlyanov, Yuri Geints, Ekaterina Panina

Proc. SPIE. 6936, Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics

KEYWORDS: Luminescence, Particles, Atmospheric particles, Spherical lenses, Absorption, Bioalcohols, Geometrical optics, Scattering, Photons, Femtosecond phenomena

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Proceedings Article | 26 April 2007 Paper

Aerosol scattering of supercontinuum radiation formed upon femtosecond laser pulse filamentation in the atmosphere

Alexander Zemlyanov, Yurii Geints, Dmitrii Apeksimov

Proc. SPIE. 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers

KEYWORDS: Atmospheric particles, Scattering, Light scattering, Laser scattering, Aerosols, Femtosecond phenomena, Backscatter, Spherical lenses, Particles, Clouds

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Proceedings Article | 1 November 2006 Paper

Processes of stimulated emission and two-photon induced fluorescence of organic dye in the dielectric microcavities at ultrashort laser pulses influence

Elena Bykova, Alexander Zemlyanov, Yuri Geints

Proc. SPIE. 6522, Thirteenth Joint International Symposium on Atmospheric and Ocean Optics/ Atmospheric Physics

KEYWORDS: Atmospheric particles, Luminescence, Molecules, Spherical lenses, Absorption, Ultrafast phenomena, Resonators, Optical microcavities, Electroluminescence, Particles

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