TY - JOUR AU - Alhaddad, Samer AU - Förstner, Jens AU - Grynko, Yevgen ID - 43018 JF - Journal of Quantitative Spectroscopy and Radiative Transfer KW - tet_topic_scattering SN - 0022-4073 TI - Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength VL - 302 ER - TY - JOUR AB - We study a double-scattering coherent mechanism of negative polarization (NP) near opposition that is observed for powder-like surfaces. The problem is solved numerically for absorbing structures with irregular constituents, cubes, spheres, and ellipsoids larger than the wavelength of incident light. Our simulations show that double scattering between two random irregular particles shows weak NP. Adding one more particle significantly increases the relative contribution of double scattering which enhances NP. Simulations with regular shapes and controlled geometric parameters show that the interference mechanism is sensitive to the geometry of the scattering system and can also result in no polarization or even strong enhancement of positive polarization at backscattering. AU - Alhaddad, Samer AU - Grynko, Yevgen AU - Farheen, Henna AU - Förstner, Jens ID - 29075 IS - 1 JF - Optics Letters KW - tet_topic_scattering SN - 0146-9592 TI - Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles VL - 47 ER - TY - GEN AU - Grynko, Yevgen AU - Shkuratov, Yuriy AU - Alhaddad, Samer AU - Förstner, Jens ID - 34136 KW - tet_topic_scattering TI - Light backscattering from numerical analog of planetary regoliths ER - TY - JOUR AB - We model negative polarization, which is observed for planetary regoliths at backscattering, solving a full wave problem of light scattering with a numerically exact Discontinuous Galerkin Time Domain (DGTD) method. Pieces of layers with the bulk packing density of particles close to 0.5 are used. The model particles are highly absorbing and have irregular shapes and sizes larger than the wavelength of light. This represents a realistic analog of low-albedo planetary regoliths. Our simulations confirm coherent backscattering mechanism of the origin of negative polarization. We show that angular profiles of polarization are stabilized if the number of particles in a layer piece becomes larger than ten. This allows application of our approach to the negative polarization modeling for planetary regoliths. AU - Grynko, Yevgen AU - Shkuratov, Yuriy AU - Alhaddad, Samer AU - Förstner, Jens ID - 31574 JF - Icarus KW - tet_topic_scattering SN - 0019-1035 TI - Negative polarization of light at backscattering from a numerical analog of planetary regoliths VL - 384 ER - TY - CHAP AB - We review our results of numerical simulations of light scattering from different systems of densely packed irregular particles. We consider spherical clusters, thick layers and monolayers with realistic topologies and dimensions much larger than the wavelength of light. The maximum bulk packing density of clusters is 0.5. A numerically exact solution of the electromagnetic problem is obtained using the Discontinuous Galerkin Time Domain method and with application of high- performance computing. We show that high packing density causes light localization in such structures which makes an impact on the opposition phenomena: backscattering intensity surge and negative linear polarization feature. Diffuse multiple scattering is significantly reduced in the case of non-absorbing particles and near-field interaction results in a percolation-like light transport determined by the topology of the medium. With this the negative polarization feature caused by single scattering gets enhanced if compared to lower density samples. We also confirm coherent double scattering mechanism of negative polarization for light scattered from dense absorbing slabs. In this case convergent result for the scattering angle polarization dependency at backscattering can be obtained for a layer of just a few tens of particles if they are larger than the wavelength. AU - Grynko, Yevgen AU - Shkuratov, Yuriy AU - Alhaddad, Samer AU - Förstner, Jens ED - Kokhanovsky, Alexander ID - 33466 KW - tet_topic_scattering SN - 2509-2790 T2 - Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media TI - Light Scattering by Large Densely Packed Clusters of Particles VL - 8 ER - TY - JOUR AB - We numerically simulate multiple light scattering in discrete disordered media represented by large clusters of irregular non-absorbing particles. The packing density of clusters is 0.5. With such conditions diffuse scattering is significantly reduced and light transport follows propagation channels that are determined by the particle size and topology of the medium. This kind of localization produces coherent backscattering intensity surge and enhanced negative polarization branch if compared to lower density samples. AU - Grynko, Yevgen AU - Shkuratov, Yuriy AU - Förstner, Jens ID - 17803 JF - Journal of Quantitative Spectroscopy and Radiative Transfer KW - tet_topic_scattering SN - 0022-4073 TI - Light backscattering from large clusters of densely packed irregular particles VL - 255 ER - TY - JOUR AB - We consider light scattering from a new type of model particle whose shape is represented in the form of a generalized ellipsoid having N foci, where N is greater than two. Such particles can be convex as well as concave. We use the geometrical optics approximation to study the light scattering from 3-foci particles. Non-zero elements of the scattering matrix are calculated for ensembles of randomly oriented independent transparent particles, m = n + i0. Several internal reflection orders are considered separately. It was found that the transmission-transmission (TT) and transmission-reflectance-transmission (TRT) components dominate in the formation of intensity of scattered light at large and small phase angles, respectively. We found a significant role of the total internal reflections of the TRT in the middle portion of the phase angle range. The main factors in the formation of positive linear polarization are the R and TRT component. The TT component is responsible for the formation of negative polarization branch at large phase angles. AU - Stankevich, Dmitriy AU - Hradyska, Larissa AU - Shkuratov, Yuriy AU - Grynko, Yevgen AU - Videen, Gorden AU - Förstner, Jens ID - 8872 JF - Journal of Quantitative Spectroscopy and Radiative Transfer KW - tet_topic_scattering SN - 0022-4073 TI - Light scattering by 3-Foci convex and concave particles in the geometrical optics approximation VL - 231 ER - TY - JOUR AB - We study the dependence of the intensity and linear polarization of light scattered by isolated particles with the compact irregular shape on their size using the discontinuous Galerkin time domain numerical method. The size parameter of particles varies in the range of X = 10 to 150, and the complex refractive index is m = 1.5 + 0i. Our results show that the backscattering negative polarization branch weakens monotonously, but does not disappear at large sizes, up to the geometrical optics regime, and can be simulated without accounting for wave effects. The intensity backscattering surge becomes narrower with increasing particle size. For X = 150, the surge width is several degrees. AU - Grynko, Yevgen AU - Shkuratov, Yuriy AU - Förstner, Jens ID - 4324 IS - 15 JF - Optics Letters KW - tet_topic_scattering SN - 0146-9592 TI - Intensity surge and negative polarization of light from compact irregular particles VL - 43 ER - TY - JOUR AB - We numerically simulate the circular polarization ratio of the radar signal backscattered from a large-grain cometary coma and compare the simulation results with the radar measurements for seven comets. We apply the discrete dipole approximation method and a model of random irregular particles. Our results confirm water ice composition of the cm-sized chunks detected by the NASA Deep Impact space probe in the vicinity of the nucleus of Comet 103P/Hartley 2. The index of the power-law size distribution in this case can be constrained to the range n ≈ 3.3–4.3. For the other considered comets the circular polarization ratio can be reproduced with variations of the power index between 2 and 5. AU - Dogra, Shraddha AU - Grynko, Yevgen AU - Zubko, Evgenij AU - Förstner, Jens ID - 3523 JF - Astronomy & Astrophysics KW - tet_topic_scattering SN - 0004-6361 TI - Radar backscattering from a large-grain cometary coma: numerical simulation VL - 608 ER - TY - JOUR AB - The problem of light scattering by ice crystals of cirrus clouds is considered in the case of a hexagonal ice plate with different distributions over crystal orientations. The physical-optics approximation based on (E, M)-diffraction theory is compared with two exact numerical methods: the finite difference time domain (FDTD) and the discontinuous Galerkin time domain (DGTD) in order to estimate its accuracy and limits of applicability. It is shown that the accuracy of the physical-optics approximation is estimated as 95% for the averaged backscattering Mueller matrix for particles with size parameter more than 120. Furthermore, the simple expression that allows one to estimate the minimal number of particle orientations required for appropriate spatial averaging has been derived. AU - Konoshonkin, Alexander AU - Borovoi, Anatoli AU - Kustova, Natalia AU - Okamoto, Hajime AU - Ishimoto, Hiroshi AU - Grynko, Yevgen AU - Förstner, Jens ID - 3834 JF - Journal of Quantitative Spectroscopy and Radiative Transfer KW - tet_topic_scattering SN - 0022-4073 TI - Light scattering by ice crystals of cirrus clouds: From exact numerical methods to physical-optics approximation VL - 195 ER - TY - CONF AB - In the problem of light scattering by ice crystals of cirrus clouds, two exact methods (FDTD – finite difference time domain and DGTD – discontinuous Galerkin time domain) and the physical-optics approximation are used for numerical calculations of the Mueller matrix in the case of ice hexagonal plates and columns. It is shown that for the crystals larger than 10 μm at the wavelength of 0.532 μm the exact methods and physical-optics approximation closely agreed within three diffraction fringes about the centers of the diffraction patterns. As a result, in the case of random orientation of these crystals, the physical-optics approximation provides accuracy 95% for the averaged Mueller matrix. AU - Konoshonkin, Alexander V. AU - Kustova, Natalia V. AU - Borovoi, Anatoli G. AU - Okamoto, H. AU - Sato, K. AU - Ishimoto, H. AU - Grynko, Yevgen AU - Förstner, Jens ED - Matvienko, Gennadii G. ED - Romanovskii, Oleg A. ID - 3840 KW - tet_topic_scattering T2 - 22nd International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics TI - Comparison between the physical-optics approximation and exact methods solving the problem of light scattering by ice crystals of cirrus clouds ER - TY - JOUR AB - We simulate light scattering by random irregular particles that have dimensions much larger than the wavelength of incident light at the size parameter of 𝑋=200 using the discontinuous Galerkin time domain method. A comparison of the DGTD solution for smoothly faceted particles with that obtained with a geometric optics model shows good agreement for the scattering angle curves of intensity and polarization. If a wavelength-scale surface roughness is introduced, diffuse scattering at rough interface results in smooth and featureless curves for all scattering matrix elements which is consistent with the laboratory measurements of real samples. AU - Grynko, Yevgen AU - Shkuratov, Yuriy AU - Förstner, Jens ID - 3843 IS - 15 JF - Optics Letters KW - tet_topic_scattering SN - 0146-9592 TI - Light scattering by irregular particles much larger than the wavelength with wavelength-scale surface roughness VL - 41 ER - TY - JOUR AB - The physical optics approximations are derived from the Maxwell equations. The scattered field equations by Kirchhoff, Stratton-Chu, Kottler and Franz are compared and discussed. It is shown that in the case of faceted particles, these equations reduce to a sum of the diffraction integrals, where every diffraction integral is associated with one plane–parallel optical beam leaving a particle facet. In the far zone, these diffraction integrals correspond to the Fraunhofer diffraction patterns. The paper discusses the E-, M- and (E, M)-diffraction theories as applied to ice crystals of cirrus clouds. The comparison to the exact solution obtained by the discontinuous Galerkin time domain method shows that the Kirchhoff diffraction theory is preferable. AU - Konoshonkin, Alexander V. AU - Kustova, Natalia V. AU - Borovoi, Anatoli G. AU - Grynko, Yevgen AU - Förstner, Jens ID - 3849 JF - Journal of Quantitative Spectroscopy and Radiative Transfer KW - tet_topic_scattering SN - 0022-4073 TI - Light scattering by ice crystals of cirrus clouds: comparison of the physical optics methods VL - 182 ER - TY - JOUR AU - Grynko, Yevgen AU - Shkuratov, Yuriy AU - Förstner, Jens ID - 1783 IS - 23 JF - Optical Letters KW - tet_topic_scattering TI - Light scattering by randomly irregular dielectric particles larger than the wavelength VL - 38 ER -