Resonant scattering of electromagnetic waves by a lossy periodic dielectric waveguide

The problem of the excitation of guided modes in planar dielectric waveguid es with periodically modulated surfaces is considered. In particular, the f orm of the radiation pattern of a lossy waveguide, the width and the positi on of the central angle of the radiation pattern as a function of the surfa ce modulation depth are studied. A special numerical-analytical method for the calculation of the intensities of guided modes has been developed. In t he case of a small modulation depth, this method makes use the expansion of the solutions of Maxwell equations into the Laurent series near the scatte ring matrix pole. (C) 2000 Elsevier Science Ltd. All rights reserved.