Analytical expression for wave scattering from exponential height correlated rough surfaces

TL;DR

This paper derives an analytical expression for wave scattering from exponential height correlated rough surfaces, analyzing how surface roughness parameters influence scattering intensity.

Contribution

It provides a new analytical model for wave scattering from exponential correlated surfaces, including asymptotic regimes and effects of Hurst exponents.

Findings

Diffuse scattering decreases with scattering angle as Hurst exponent increases.

Analytical expressions help understand scattering from known rough surfaces.

Surface roughness parameters significantly affect scattering intensity.

Abstract

Wave scattering from rough surfaces in addition the inverse scattering is an interesting approach to obtain the surface topography properties in various fields. Analytical expression in wave scattering from some known rough surfaces, not only help us to understand the scattering phenomena, but also would prove adequate to be a criterion to measure the information for empirical rough surfaces. For a rough surface with an exponential height correlation function, we derive an analytical expression for the diffused part and expanded it in two asymptotic regimes. We consider one surface as slightly rough and the other as very rough based on the framework of the Kirchhoff theory. In the end, we have measured the role of various Hurst exponents and correlation lengths on scattering intensity in self-affine surfaces. We have shown that by increasing the Hurst exponent from H=0 to H=1, the diffuse scattering decreases with the scattering angle.