Zubko E. Computer simulation of light backscattering by particles and random discrete medium

Object of study: the particles of irregular random shape and random discrete media consisting of such kind of particles. Aim: to establish regularity of lightscattering by particles and media with complex structure. Methods: the discrete-dipole approximation method, Mie theory; numerical model of radiate transfer in discrete media consisting of irregular particles suggested in this work. Results, novelty: It was at first time found that the particles of irregular random shape, which are comparable in size with wavelength form the vastly asymmetrical negative branch of linear polarization degree. It was at first time shown, that symmetrical negative branch of linear polarization degree could be received with mixing of two different kinds of particles with its own asymmetrical negative branches of linear polarization degree. It was at first time established new coordinate-free equation for solution of the plain monochromatic electromagnetic wave diffraction on ball problem (Mie theory). It was at first time created the computer model of lightscattering by powder-like surfaces, which qualitatively agrees well with laboratory experiment data. It was at first time found, that in discontinuous media only coherent amplification of backscattering forms negative branch of linear polarization degree. It was at first time found, that even for as dark as soot evaporated on glass objects the high scattering orders influence on shape of negative branch of linear polarization degree. Field of implementation: optics, radiophysics