Ultra-broadband wide-angle unidirectional plasmonic coupler based on joint effects of plasmonic critical angles and subwavelength metallic gratings

Authors

Fan Lu, Peking University
Feng Xiao, Edith Cowan UniversityFollow
Kun Li, Peking University
Anshi Xu, Peking University

Document Type

Journal Article

Publisher

Optical Society of America

Faculty

Faculty of Health, Engineering and Science

School

Electron Science Research Institute

Comments

Lu F., Xiao F., Li K., Xu A. (2014). Ultra-broadband wide-angle unidirectional plasmonic coupler based on joint effects of plasmonic critical angles and subwavelength metallic gratings. Optics Letters, 39(11), 3254-3257. Available here

Abstract

A unidirectional plasmonic coupler with ultra-broadband and wide-angle coupling efficiency is proposed and demonstrated. Employing the plasmonic critical angle (PCA) phenomenon in conjunction with the effect of subwavelength metallic gratings, a wide incident angular full-width-half-maximum (AFWHM >28°) coupling efficiency larger than 50% and extinction ratio better than 15 dB over an ultrabroad wavelength range 725-985 nm (bandwidth >260 nm) are achieved. The operation principle and performance of the structure are clarified and theoretically illustrated.

DOI

10.1364/OL.39.003254

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