New Features of Scattering from a Dielectric Film on a Reflecting Metal Substrate (Part 1)

摘要

The authors recently observed several features from a randomly rough dielectric film on a reflecting metal substrate, including a change in the spectrum of the light at the satellite peaks, the high-order correlation, and enhanced backscattering from the grazing angle. In this paper, they focus on the enhanced backscattering phenomena. The backscattering signal at small grazing angles is very important for vehicle re-entrance and subsurface radar sensing applications. Recently, they performed an experimental study of the far- field scattering at small grazing angles, especially the enhanced backscattering at grazing angles. For a randomly weak, rough dielectric film on a reflecting metal substrate, a much larger enhanced backscattering peak is measured. Experimental results are compared with theoretical predictions based on the two-scale surface roughness scattering model.