Ultra-broadband wide-angle unidirectional plasmonic coupler based on joint effects of plasmonic critical angles and subwavelength metallic gratings
Document Type
Journal Article
Publisher
Optical Society of America
Faculty
Faculty of Health, Engineering and Science
School
Electron Science Research Institute
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
Access Rights
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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