Abstract

A preceding paper [ J. Opt. Soc. Am. A 7, 1736 ( 1990)] demonstrated an interesting property of perfect blazing in transmission for triangular-groove dielectric gratings. The grating was obtained by evaporating an infinitely thin layer of perfectly conducting metal on the small facet of the groove. If an antireflection coating is deposited on top of the large facet, the electromagnetic theory is able to predict an efficiency of 100% in transmission. Our purpose is first to generalize this blazing property to gratings with inhomogeneous index and then to give a numerical confirmation of these theoretical predictions using a computer code based on a rigorous finite-element method [ J. Opt. Soc. Am. A 10, 2592 ( 1993)]. The precision of this numerical verification is quite good. The curves of efficiency near the blazing effect show remarkable widths in wavelength and incidence.

© 1996 Optical Society of America

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