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Ultra-wide Angle Unidirectional Plasmonic Coupler Based on Chirped Ridge Grating

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Abstract

A novel coupling scheme for unidirectional coupling of surface plasmons over a broad-angle range is proposed, the large AFWHM up to 60o is achieved by cascading the grating resonance angle peak and the asymmetric excitation peak.

© 2015 Optical Society of America

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