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

Authors/Creators

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

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.

Document Type

Journal Article

Date of Publication

1-1-2014

Faculty

Faculty of Health, Engineering and Science

Publisher

Optical Society of America

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

Copyright

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