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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 11 — Jun. 1, 2014
  • pp: 3254–3257

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

Fan Lu, Feng Xiao, Kun Li, and Anshi Xu  »View Author Affiliations


Optics Letters, Vol. 39, Issue 11, pp. 3254-3257 (2014)
http://dx.doi.org/10.1364/OL.39.003254


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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 >260nm) are achieved. The operation principle and performance of the structure are clarified and theoretically illustrated.

© 2014 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(250.5403) Optoelectronics : Plasmonics
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optoelectronics

History
Original Manuscript: January 8, 2014
Revised Manuscript: April 8, 2014
Manuscript Accepted: April 15, 2014
Published: May 27, 2014

Citation
Fan Lu, Feng Xiao, Kun Li, and Anshi Xu, "Ultra-broadband wide-angle unidirectional plasmonic coupler based on joint effects of plasmonic critical angles and subwavelength metallic gratings," Opt. Lett. 39, 3254-3257 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-11-3254


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