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

2026, Marinyuk,V. V., Pavlova, M. A., Rogozkin, D. B., Sheberstov, S. V., Маринюк, Виталий Владиславович

2023, Marinyuk, V. V., Sheberstov, S. V., Маринюк, Виталий Владиславович

2021, Marinyuk, V. V., Маринюк, Виталий Владиславович

© 2021 American Physical Society.We study the effect of strong single scattering on the C0 correlation of intensity fluctuations in a disordered ensemble of discrete scatterers. Diagrammatic calculations of the C0 contribution to the spatial correlation function are carried out for both scalar and electromagnetic waves beyond the standard Born approximation. For a system of Mie particles, the dependence of C0 on the size and refractive index of the scatterers is examined. It is found that for highly refracting particles, the C0 correlation acquires a pronounced resonant character. Close to the resonances, due to correlations between more than two wave fields, the magnitude of C0 grows drastically, greatly exceeding the value for Born scatterers.

2020, Marinyuk, V. V., Remizovich, V. S., Sheberstov, S. V., Маринюк, Виталий Владиславович

We study the angular distribution of light diffusely reflected from a turbid medium with large (compared to the light wavelength) inhomogeneities. Using Monte Carlo radiative transfer simulations, we calculate the azimuthally averaged bidirectional reflectance for an optically thick plane-parallel medium and analyze its dependence on the parameters of the scattering phase function. To model single scattering in the medium, we take advantage of the Reynolds-McCormick phase function. For grazing angles of incidence, we find that the angular distribution of reflected light becomes very sensitive to the angular profile of the scattering phase function. The more elongated the phase function, the more pronounced the peak that arises around the specular reflection angle. Comparison of our numerical results with an analytic solution of the radiative transfer equation is performed, and it is shown that the bidirectional reflectance can be decomposed into two contributions, namely, the diffusion contribution and the contribution from light experiencing multiple scattering through small angles. The latter relates directly to the angular profile of the scattering phase function and is responsible for the peak in the angular distribution of reflected light. An explicit analytic formula for the azimuthally averaged bidirectional reflectance is obtained. (C) 2020 Optical Society of America

2024, ГОРОДНИЧЕВ, Е. Е., МАРИНЮК, В. В., Маринюк, Виталий Владиславович, Городничев, Евгений Евгеньевич

Из уравнения Бетё-Солпитера (БС), в предположении о «куперонной» природе сильной локализации, получена система самосогласованных диффузионных уравнений для пропагатора плотности энергии и коэффициента диффузии излучения в конечном образце с неоднородностями произвольного размера. Показано, что куперонный вклад в ядро уравнение БС не влияет на энергетический баланс и оптическая теорема остаётся такой же, как и без учёта интерференции волн. В случае Q1D геометрии вычислены длина локализации и коэффициент прохождения волн в оптически длинном волноводе.

2025, ГОРОДНИЧЕВ, Е. Е., МАРИНЮК, В. В., РОГОЗКИН, Д. Б., Маринюк, Виталий Владиславович, Городничев, Евгений Евгеньевич

Из уравнения Бетё-Солпитера получена система самосогласованных диффузионных уравнений для пропагатора плотности энергии и коэффициента диффузии электромагнитных волн в случайном ансамбле частиц в условиях медленного затухания циркулярной поляризации. Вычислены длина локализации и коэффициент прохождения света в оптически длинном волноводе.

2023, Marinyuk, V. V., Sheberstov, S. V., Маринюк, Виталий Владиславович

A simple method is proposed for calculating the asymptotic attenuation coefficient K∞ of sea water. The method is based on the scaling analysis of the radiative transfer equation within the small-angle approximation. From the scaling, it follows that K∞ is analytically expressed in terms of the absorption coefficient, the transport scattering coefficient, and two dimensionless numeric constants (scaling exponents) depending on a specific scattering phase function. For a given phase function, the scaling exponents can be determined by numerical calculations of the downwelling irradiance. We test the method on a number of oceanlike scattering models. A direct numerical integration of the radiative transfer equation is carried out with the DISORT code for the Petzold, Morel et al., Fournier–Forand and Kopelevich phase functions. Our numerical results agree perfectly with the small-angle scaling and allow us to establish an explicit expression for K∞ for each phase function. We find that the scaling exponents depend rather weakly on the specific angular profile of the phase function and can be taken equal to their values for the Henyey–Greenstein function (this approximation leads to a relative error in the value K∞ less than 5%). So that, within a few percent accuracy, the coefficient K∞ is governed only by the absorption and transport scattering coefficients and is described by a universal formula. © 2022 Elsevier Ltd

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.

2024, Marinyuk, V. V., Pavlova, M. A., Rogozkin, D. B., Sheberstov, S. V., Маринюк, Виталий Владиславович, Рогозкин, Дмитрий Борисович