Scattering of Optical Field by a Rough Multi-Scale Mirror Surface

TL;DR

This paper investigates how optical waves scatter off a multi-scale rough mirror surface using diffusion phase approximation and numerical modeling, revealing the impact of surface roughness distribution on scattering patterns.

Contribution

It introduces a numerical approach combining diffusion phase approximation and phase jump modeling to analyze multi-scale surface scattering effects.

Findings

Roughness distribution significantly influences scattering intensity.

Backscattering patterns depend on multi-scale surface features.

Numerical results illustrate the impact of surface modulation on scattering indicatrix.

Abstract

Scattering of optical waves by a multi-scale rough mirror surface as a phase screen is considered. To solve the problem we used the diffusion phase approximation and numerical model of a phase jump. The scattering intensity was averaged over the ensemble of realizations. The results of numerical calculations of the angular dependence of the intensity are presented for a backscattering demonstrating the effect of the roughness distribution over the scales and its secondary impact on the indicatrix of scattering for multiplicative surface modulation.