Numerical analysis of diffraction from a sinusoidal metal grating

Diffraction of plane waves by a metal grating of a sinusoidal cross section is investigated theoretically by considering a finite conductivity of the material. The analysis is based on the mode‐matching method with a smoothing operation. The numerical results of the diffracted power from a sinusoida...

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Bibliographic Details
Published in:Electronics & communications in Japan. Part 1, Communications Communications, 1987, Vol.70 (8), p.70-78
Main Authors: Yasuura, Kamenosuke, Murayama, Masanao
Format: Article
Language:English
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Summary:Diffraction of plane waves by a metal grating of a sinusoidal cross section is investigated theoretically by considering a finite conductivity of the material. The analysis is based on the mode‐matching method with a smoothing operation. The numerical results of the diffracted power from a sinusoidal gold grating are presented with sufficient accuracy for both P‐polarization and S‐polarization. The results have been compared with those for perfectly conducting gratings. It is found that: (i) the reflected power is reduced due to loss compared to the perfectly conducting case, and the acuteness of the anomalous diffraction phenomenon called Wood's anomaly is decreased; and (ii) another anomaly called plasmon anomaly is observed in the case of P‐polarization. The latter cannot be observed in a perfect conductor.
ISSN:8756-6621
1520-6424
DOI:10.1002/ecja.4410700808