SCATTERING FROM FRACTALLY CORRUGATED SURFACES - AN EXACT APPROACH

We consider the scattering of optical or electromagnetic waves from pe rfectly conducting rough surfaces modeled by a multiscale fractal func tion through the use of the extended boundary condition method. This e xact method is developed here through the expansion of the surface fie ld in terms of generalized Floquet modes, which results in a closed-fo rm solution that can be evaluated numerically. The method is validated by comparison with the Kirchhoff (approximate) method in its regime o f validity and by calculation of the energy balance parameter. (C) 199 5 Optical Society of America