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Telecommunications and Radio Engineering

Выходит 12 номеров в год

ISSN Печать: 0040-2508

ISSN Онлайн: 1943-6009

SJR: 0.185 SNIP: 0.268 CiteScore™:: 1.5 H-Index: 22

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Suppression of Specular Reflection from a Well-Reflecting Surface

Том 52, Выпуск 12, 1998, pp. 15-19
DOI: 10.1615/TelecomRadEng.v52.i12.40
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Краткое описание

The effect of total suppression of specular reflection was first experimentally studied in [1] for the simplest geometry in which the plane of incidence is perpendicular to grating strips. This effect is of great interest for theoretical studies and applications. It is caused by the practically total transformation of the incident wave into the resonantly excited surface electromagnetic wave. The latter, as is well known, is a natural mode of the plane boundary of an ideally conducting medium. If the parameters of one of the diffracted waves are close to those of the surface electromagnetic wave, then, due to resonance, a considerable part of the energy of the incident wave can be pumped into this diffracted wave, which results in anomalously small values of the reflection factor even for small amplitudes of the grating. Nowadays, such anomalous effects, first observed by Wood [2], are actively studied both theoretically and experimentally (e.g., see [3]).
In the present paper we use impedance boundary conditions, which significantly simplifies calculations and allows us to study this effect for a sufficiently wide class of materials and wavelengths: from the visible and infrared to the microwave region of the spectrum. The use of the Rayleigh hypothesis is an additional simplification, but this is not a restriction, since the effect of the total suppression of specular reflection is observed on relief gratings that are not deep as compared to the wavelength λ, while impedance gratings can be realized on plane boundaries.

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