SCATTERING FROM A PERIODIC INHOMOGENEOUS-MEDIUM WITH A ROUGH INTERFACE

A hybrid technique that utilizes the finite-element method (FEM) and a n analytic solution is presented for the analysis of the scattering of a plane wave from a periodic inhomogeneous medium, having arbitrary g eometry and material properties. This medium is overlaid with a homoge neous one that presents a rough interface with the space from which th e incident plane wave originates. The rough interface is studied with a perturbative method, whereas the inhomogeneous medium is examined wi th the finite-element procedure. The two methods are matched imposing the continuity of the fields into the homogeneous medium. (C) 1995 Joh n Wiley & Sons, Inc.