Experimental validation of strong directional selectivity in nonsymmetric metallic gratings with a subwavelength slit
Author
Cakmakyapan, S.
Caglayan, H.
Serebryannikov, A. E.
Özbay, Ekmel
Date
2011-02-02Source Title
Applied Physics Letters
Print ISSN
0003-6951
Publisher
American Institute of Physics
Volume
98
Issue
5
Pages
051103-1 - 051103-3
Language
English
Type
ArticleItem Usage Stats
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Abstract
Strong directional selectivity is theoretically predicted and experimentally validated at the microwave frequencies in the beaming regime for a single subwavelength slit in nonsymmetric metallic gratings with double-side corrugations. The operation regime can be realized at a fixed angle of incidence when the surface-plasmon assisted transmission is significant within a narrow range of observation angles, if illuminating one of the grating interfaces, and tends to vanish for all observation angles, if illuminating the opposite interface. The studied effect is connected with asymmetry (nonreciprocity) in the beaming that occurs if the surface plasmon properties are substantially different for the two interfaces being well isolated from each other.
Keywords
Directional selectivityExperimental validations
Fixed angles
Metallic gratings
Nonreciprocity
Nonsymmetric
Observation angle
Operation regime
Subwavelength slits
Surface plasmons
Surface-plasmon
Diffraction gratings
Plasmons