Simulation for light scattering by rough surface based on Kirchhoff's diffraction theory

Abstract

We examine the light scattering by rough surface based on the Kirchhoff theory of diffraction equation. The electric field on the arbitrary smooth surface surrounding the rough surface of interest is derived by the ray optics simulation for the scattering by such rough surface. After that, the intensity of the scattered light far from the smooth surface is deduced from an usual analytical way. It is found from a comparison of our results with those obtained by other methods, such as T-matrix method, that our method is applicable, at least, for spheroids. We also test our method to apply to the scattering by a two dimensional comb shaped surface, which is a special case of the rough analogue for the regolith layer on the surface of the airless small body in the solar system.