Abstract

A Rayleigh–Fourier method is used in an analysis of anomalous resonance effects on multilayer-overcoated, low-efficiency gratings. The ratio of grating amplitude to wavelength, H/λ, is 0.016. For wavelength-to-grating-period values such that only the specular beam and the −1 diffracted order are reflected from the grating, such H/λ values yield a nominal −1-order efficiency on the order of 2%. However, for carefully selected parameters such that coupling of incident beam energy into guided waves is achieved, the −1-order efficiency may exceed 50% and is accompanied by a corresponding reduction in the specular beam intensity. The range over which this anomalous behavior occurs is quite narrow. Composite dielectric structures of one to ten layers are considered.

© 1988 Optical Society of America

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