2023, Gorodnichev, E. E., Rogozkin, D. B., Городничев, Евгений Евгеньевич, Рогозкин, Дмитрий Борисович

We study an optical analogue of the Aharonov-Bohm effect in a magneto-active medium containing a wire with current. It is shown that the phase shift between the light rays propagating around the wire is proportional to the current strength. The current acts as a magnetic flux in the conventional Aharonov-Bohm effect. Therefore the differential cross section of light scattering from the vortex of the magnetic field created by the linear current proves to be a periodic function of the current strength.

2022, Andriyash, A. V., Ismailov, S. M., Kamenev, V. G., Kaplukov, G. V., Rogozkin, D. B., Рогозкин, Дмитрий Борисович

2020, Gorodnichev, E. E., Rogozkin, D. B., Городничев, Евгений Евгеньевич, Рогозкин, Дмитрий Борисович

© Published under licence by IOP Publishing Ltd.We show that coherent backscattering of light from a disordered sample in a magnetic field can exhibit unusual features. The helicity retention in scattering from particles of the sample underlies these features. In the magnetic field parallel to the sample surface, the peak of coherent backscattering of circularly polarized light shifts from the backward direction by an angle proportional to the magnetic field strength. For linearly polarized light the coherent backscattering cone splits into two ones. The results obtained correlate well with the available experimental data.

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.

2021, Gorodnichev, E. E., Rogozkin, D. B., Городничев, Евгений Евгеньевич, Рогозкин, Дмитрий Борисович

© 2021 Institute of Physics Publishing. All rights reserved.We study an optical analogue of the Aharonov-Bohm effect in a magneto-active medium containing a wire with current. It is shown that the phase shift between the light rays propagating around the wire is proportional to the current strength. The current acts as a magnetic flux in the conventional Aharonov-Bohm effect. Therefore the differential cross section of light scattering from the vortex of the magnetic field created by the linear current proves to be a periodic function of the current strength.

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.

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.

2025, Marinyuk, V. V., Rogozkin, D. B., Sheberstov, S. V., Маринюк, Виталий Владиславович, Рогозкин, Дмитрий Борисович

2020, Gorodnichev, E. E., Kondratiev, K. A., Kuzovlev, A. I., Rogozkin, D. B., Городничев, Евгений Евгеньевич, Кондратьев, Кирилл Александрович, Кузовлев, Александр Иванович, Рогозкин, Дмитрий Борисович

We present the results of a theoretical study of underwater pulse propagation. The vector radiative transfer equation (VRTE) underlies our calculations of the main characteristics of the scattered light field in the pulse. Under the assumption of highly forward scattering in seawater, three separate equations for the basic modes are derived from the exact VRTE. These three equations are further solved both within the small-angle approximation and numerically. The equation for the intensity is analyzed for a power-law parametrization of the wings of the sea water phase function. The distribution of early arrival photons in the pulse, including the peak intensity, is calculated. Simple relations are also presented for the variance of the angular distribution of radiation, the effective duration of the signal and other parameters of the pulse. For linearly and circularly polarized pulses, the temporal profile of the degree of polarization is calculated for actual data on the scattering matrix elements. The degree of polarization is shown to be described by the self-similar dependence on some combination of the transport scattering coefficient, the temporal delay and the source-receiver distance. Our results are in agreement with experimental and Monte-Carlo simulation data. The conclusions of the paper offer a theoretical groundwork for application to underwater imaging, communication and remote sensing.

1989, Городничев, Е. Е., Дударев, С. Л., Рогозкин, Д. Б., Рогозкин, Дмитрий Борисович, Городничев, Евгений Евгеньевич