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Scattering by dual-blazed corrugated conducting strips and small reflection gratings

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Abstract

A numerical analysis of thin corrugated conducting strips with rectangular-groove profiles dual blazed to the n = −1 spectral order shows that high-efficiency gratings remain efficient as the number of grating elements is reduced to as few as two, provided that incidence is not near grazing. Numerical results show that the main effect of reduced grating size is a broadening of the diffracted beam, which can be predicted from a simple formula. For TM polarization a single corrugation diffracts correctly, but current singularities at the ends prevent this for TE polarization. The results are shown to apply also to gratings of the same surface profile but with flat bottoms of finite thickness.

© 1985 Optical Society of America

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