Iterative Solution of the Rough-Surface Scattering Problem

摘要

An iterative solution to the problem of scattering from a one-dimensional roughsurface is obtained for the Dirichlet boundary condition. The advantages of this method are that bounds for the convergence of the solution may be established and that the solution may be readily iterated to sufficiently high order in the interaction to examine the rate at which it converges. Absolute convergence of the iterative solution is also a sufficient condition for the convergence of the operator expansion method for surfaces on which the slope is everywhere less than unity. A numerical example of scattering from an echelette grating is considered, and bounds for convergence established. It is found that for scattering from such surfaces, the rate at which the iterative solution converges decreases as the surface slope is increased. Corresponding results are found for the operator expansion method.