Персона:
Рогозкин, Дмитрий Борисович

Организационные подразделения

Организационная единица

Институт лазерных и плазменных технологий

Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.

Статус

Трудовой контракт завершен

Фамилия

Рогозкин

Имя

Дмитрий Борисович

Полная страница элемента

Результаты поиска

Теперь показываю 1 - 10 из 18

Только метаданные
Optical beam spread in seawater
(2025) Marinyuk, V. V.; Rogozkin, D. B.; Sheberstov, S. V.; Маринюк, Виталий Владиславович; Рогозкин, Дмитрий Борисович
Только метаданные
Simultaneous application of photon Doppler velocimetry and coherent backscattering for probing ejecta from shock-loaded samples
(2022) Andriyash, A. V.; Ismailov, S. M.; Kamenev, V. G.; Kaplukov, G. V.; Rogozkin, D. B.; Рогозкин, Дмитрий Борисович
Только метаданные
Enhancement of mesoscopic fluctuations in transmission of light through a disordered medium at grazing angles
(2021) Sheberstov, S. V.; Kondrat'ev, K. A.; Marinyuk, V. V.; Rogozkin, D. B.; Кондратьев, Кирилл Александрович; Маринюк, Виталий Владиславович; Рогозкин, Дмитрий Борисович
© 2021 American Physical Society.We study how intensity fluctuations in transmission through a disordered slab change depending on the regime of wave transport. A system with large (compared to the wavelength of light) inhomogeneities is considered. Within a diagrammatic approach, the variance of the total transmission coefficient is calculated numerically beyond the diffusion approximation. A great enhancement of fluctuations is found in the crossover from the ballistic to the diffusive transport at the grazing angles of incidence on the sample surface. The effect originates from the reflection of waves that propagate nearly parallel to the sample boundaries and experience scattering through small angles, and reveals itself both in transmission and reflection and in correlations between the transmitted and reflected fluxes.
Только метаданные
Circular dichroism in the presence of resonant Mie scatterers
(2019) Gorodnichev, E. E.; Rogozkin, D. B.; Городничев, Евгений Евгеньевич; Рогозкин, Дмитрий Борисович
Unpolarised light propagation is considered in a circularly dichroic medium with optically isotropic Mie-particles. The degree of passed radiation polarisation is calculated under the assumption that multiple scattering in such a system occurs in the spatial diffusion regime. It is shown that introducing Mie particles into a homogeneous sample with natural optical activity can noticeably enhance the observed circular dichroism, namely, increase a difference between the intensities of right- and left-handed polarised light passed through the medium. If the first Kerker condition is fulfilled for Mie particles, then the effect can be almost ten times stronger as compared to the case of a homogeneous sample.
Только метаданные
Symmetry-induced enhancement of transmission through a disordered system
(2025) Flegontov, A. O.; Rogozkin, D. B.; Рогозкин, Дмитрий Борисович
Только метаданные
Coherent backscattering of light from a Faraday medium
(2022) Gorodnichev, E. E.; Kondratiev, K. A.; Rogozkin, D. B.; Городничев, Евгений Евгеньевич; Кондратьев, Кирилл Александрович; Рогозкин, Дмитрий Борисович
© 2022 American Physical Society.We study coherent backscattering (CBS) of light from a magnetoactive medium doped by Mie particles. A novel version of the CBS diffusion theory is developed, which takes into account both the Faraday effect and the effect of circular polarization memory specific to Mie scattering. The theory is based on a system of coupled diffusion equations for two slowly decaying cooperon modes arising from interference of waves with coinciding helicities. The impact of a magnetic field on CBS is shown to be controlled by the ratio of the helicity-flip scattering cross section to the transport scattering one. If this ratio is small, the CBS can exhibit unusual features first found experimentally by R. Lenke, R. Lehner, and G. Maret [Europhys. Lett. 52, 620 (2000)EULEEJ0295-507510.1209/epl/i2000-00483-y]. In the magnetic field parallel to the sample surface, the peak of coherent backscattering for circularly polarized light is shifted from the exact backward direction, while, for linearly polarized light, it splits in two ones for both co- and cross-polarization channels, and the backscattered waves acquire circular polarization. Saturation of the magnetic field dependence of the CBS cone occurs in the magnetic field normal to the surface. If the above ratio is close to unity (Rayleigh scattering) all these features disappear, and the effect of the magnetic field on the CBS angular profile is reduced to the universal law studied previously. The results obtained are in good quantitative agreement with the available Monte Carlo simulation and experimental data.
Только метаданные
Application of multiple scattering theory to Doppler velocimetry of ejecta from shock-loaded samples
(2020) Kondrat'ev, A. N.; Andriyash, A. V.; Kuratov, S. E.; Rogozkin, D. B.; Рогозкин, Дмитрий Борисович
© 2020 Elsevier LtdWe address the actual problem of retrieving the physical parameters of ejecta from data of heterodyne Doppler velocimetry. Under the assumption that ejected particles are randomly spaced and their number within the probed volume is great, the noise-free component of the power spectrum of heterodyne beats is shown to be expressed in terms of a solution to the transport equation for the field correlation function which accounts for multiple scattering and absorption of the probing beam in the ejecta cloud. This provides a means for theoretical modeling of experimental Doppler data. The ejecta cloud is considered as a plane layer of particles moving in the air away from the free-surface of the shock-loaded sample. The spatial profile of the scattering coefficient and the cloud thickness are related directly to the distribution of ejected particles over velocities and coordinates. The slowing-down of ejected particles in the air leads to an ambiguous relation between the velocity of particles and their position, resulting in essential complication of the particle distribution. Using a multi-group description of the ejecta cloud, we reduce the transport equation to a system of linked Milne-like equations. The system is solved numerically with the discrete ordinate code. Varying the values of the cloud optical thickness and the parameters of the particle distribution over sizes and initial velocities, we fit the calculated spectrum to the time-resolved data of heterodyne Doppler measurements. Such an approach enables retrieving the primary ejecta characteristics (the total ejected mass, the density-velocity profile and the size distribution of ejected particles) directly from heterodyne experiments. Application of the proposed method to the velocimetry data on ejecta is presented.
Только метаданные
Characterization of the aerosol contribution to the top-of-atmosphere radiance for satellite ocean color retrievals
(2024) Marinyuk, V. V.; Pavlova, M. A.; Rogozkin, D. B.; Sheberstov, S. V.; Маринюк, Виталий Владиславович; Рогозкин, Дмитрий Борисович
Только метаданные
Photon Doppler Velocimetry and Simulation of Ejection of Particles from the Surface of Shock-Loaded Samples
(2020) Andriyash, A. V.; Dyachkov, S. A.; Zhakhovsky, V. V.; Kalashnikov, D. A.; Rogozkin, D. B.; Рогозкин, Дмитрий Борисович
© 2020, Pleiades Publishing, Inc.Abstract: The results of photon Doppler velocimetry of ejecta from shock-loaded metal samples are reported. The experiments have been performed with tin and lead samples of a given thickness and a given surface roughness. The direct numerical simulation of the process of mass ejection from the surface of shock-loaded samples is performed for conditions close to experimental by the smoothed particle hydrodynamics method. The areal density and initial velocity distribution of the volume density of ejecta are determined. Using these results, we calculate the time dependence of the profile of the volume density at the expansion of the formed dust cloud to air. Applying an approach based on the transport equation for the correlation function of the scattered field, the main parameters of the velocity distribution of ejecta, areal density of ejecta, etc. are reconstructed from spectral photon Doppler velocimetry data. The experimentally observed temporal dynamics of spectra, which is caused by the drag of dust in air, is described at an appropriately chosen size dispersion of dust particles. The masses of ejecta reconstructed from experimental data are in agreement with the smoothed particle hydrodynamics results.
Только метаданные
Modeling the Doppler spectrum of waves backscattered from an expanding cloud for anisotropic phase functions
(2024) Kondratev, A. N.; Andriyash, A. V.; Kuratov, S. E.; Rogozkin, D. B.; Рогозкин, Дмитрий Борисович