Abstract

We point out that the phenomenon of total internal reflection appearing on interaction of an electromagnetic wave, incident from a dielectric at the corrugated interface separating this medium from vacuum, can give rise to very large reflectivities (close to 100%), even at angles of incidence with the mean plane of the interface that are well below the critical angle. Computer simulations for sinusoidal corrugations show >90% efficiency in the zeroth reflected order for an appropriate choice of the grating period and amplitude and of the wavelength of the incident wave at normal incidence. Blaze effects, analogous to those taking place in metallic gratings, also appear. An analysis of this phenomenon in terms of resonances created under this interaction is presented.

© 1992 Optical Society of America

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