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Scattering of guided waves by surface periodic gratings for arbitrary angles of incidence: perturbation field theory and implications to normal-mode analysis

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Abstract

A first-order perturbation theory describing the deflection of guided optical waves by sinusoidal surface corrugations on a slab waveguide is presented. The wave equation is satisfied everywhere in space, and the tangential fields are continuous across all interfaces to order δ0k, where k is the optical wave vector and δ0 is the maximum surface displacement. Analytical expressions are derived for synchronously generated normal modes for the geometries TEm → TEm, TEm → TMm, TMm → TMm, and TMm → TEm. Comparison with normal-mode analyses for the backscattering problem show agreement for TEm → TEm for both the local- and ideal-mode approximations. However, for TMm → TMm the results differ when ideal modes are used to describe the incident fields.

© 1981 Optical Society of America

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