BRDF analysis of material with fractal rough surface

In this paper, rough surfaces are modeled based on the WM(Weierstrass-Mandelbrot) fractal function and the effect of the change of model parameters on surface morphology are discussed. A simulation model is built using radiofrequency module supplied by COMSOL Multiphysics. BRDF(bidirectional reflectance distribution function) from different surfaces are calculated, with the changes of parameters fractal dimensions and wavelength of incident light. Result show that both forwards-cattering and backscattering are strengthened with the increase of fractal dimension and that scattering effect can be reduced when wavelength becomes longer.