Abstract

An explanation is given for the effect of total absorption of light in grazing incidence by a sinusoidal grating, recently reported by us. The behavior of the zeros of both the first and the zeroth diffraction orders is studied numerically in the complex α plane. A link between the grating anomaly, non-Littrow perfect blazing, and plasmon excitation in relief metallic gratings is established. A total analysis of the behavior of the zeroth-order zero in grazing incidence is carried out, including groove depth, wavelength, and profile dependences.

© 1989 Optical Society of America

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