Experimental study of the reflectance of two-dimensional metal surfaces with a random roughness distribution

摘要

This paper presents an evaluation of three perturbation theories and the Kirchhoff approximation for calculating the reflectance (the intensity of the coherent component) of two-dimensional metallic surfaces with a random roughness distribution. The theoretical results are compared with experimental data obtained on typical samples. The samples were fabricated from photoresist, and their metallized surface profiles are a good match with a Gaussian correlation function and a Gaussian random process. The correlation distances of these surfaces range from approximately one-fifth to two wavelengths of the IR range used in the experiment.