Experimental Validation of Strong Directional Selectivity in Nonsymmetric Metallic Gratings with a Subwavelength Slit
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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.
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Suggested Citation: Cakmakyapan, S., Humeyra, C., Serebryannikov, A.E. and Ozbay, E. (2011). Experimental validation of strong directional selectivity in nonsymmetric metallic gratings with a subwavelength slit. Applied Physics Letters. 98, 051103. © 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters and may be found at http://dx.doi.org/10.1063/1.355.2675