Multiple Light Scattering from Metal and Dielectric Rough Surfaces

摘要

A numerical study is done on light scattering from one-dimensional random roughsurfaces supporting both dielectrics and metal. The influence of the corrugation on the Brewster angle as well as on the angular distribution of transmitted intensity into the dielectric is investigated. We also obtain enhanced backscattering in the light reflected from metallic surfaces. Finally we discuss the influence of roughness on the drop of reflectance due to polariton absorption. There has been much interest in recent times in the problem of scattering of light and other electromagnetic waves form rough surfaces. Both experiments and numerical calculations based on models of both perfect conductive and penetrable surfaces have revealed new phenomena, such as enhanced backscattering. These results have two new characteristics: on the one hand, the surfaces used used in experiments are of well characterized and controlled statistics: on the other hand, the numerical methods permit the calculation of new intensity distributions from surfaces that were formerly difficult or impossible to deal with using the existing theories, such as the Kirchhoff approximation or the small perturbation method either in the field or in its phase.