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Experimental demonstration of an efficient unidirectional coupler for surface plasmons with wide-angle efficiency

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Abstract

We experimentally demonstrated a wide-angle unidirectional excitation of surface plasmon modes. Employing the plasmonic critical angle phenomenon in conjunction with the grating effect, a wide incident angular full-width-half-maximum (AFWHM=25°) with high unidirectionality of extinction ratios better than 10dB was realized.

© 2014 Optical Society of America

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