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  • Vol. 36, Iss. 15 — Aug. 1, 2011
  • pp: 2842–2844

Unidirectional transmission realized by two nonparallel gratings made of isotropic media

Wei-Min Ye, Xiao-Dong Yuan, and Chun Zeng  »View Author Affiliations


Optics Letters, Vol. 36, Issue 15, pp. 2842-2844 (2011)
http://dx.doi.org/10.1364/OL.36.002842


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Abstract

We realize a unidirectional transmission by cascading two nonparallel gratings (NPGs) made of isotropic, lossless, and linear media. For a pair of orthogonal linear polarizations, one of the gratings is designed as a polarizer, which is a reflector for one polarization and a transmitter for the other; another grating is designed as a polarization converter, which converts most of one polarized incident wave into another polarized transmitted wave. It is demonstrated by numerical calculation that more than 85% of the incident light energy can be transmitted with less than 1% transmission in the opposite direction for linearly polarized light at normal incidence, and the relative bandwidth of the unidirectional transmission is nearly 9%. The maximum transmission contrast ratio between the two directions is 62 dB . Unlike one-way diffraction grating, the transmitted light of the NPGs is collinear with the incident light, but their polarizations are orthogonal.

© 2011 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1970) Diffraction and gratings : Diffractive optics
(120.7000) Instrumentation, measurement, and metrology : Transmission

ToC Category:
Diffraction and Gratings

History
Original Manuscript: May 16, 2011
Revised Manuscript: June 17, 2011
Manuscript Accepted: June 26, 2011
Published: July 22, 2011

Citation
Wei-Min Ye, Xiao-Dong Yuan, and Chun Zeng, "Unidirectional transmission realized by two nonparallel gratings made of isotropic media," Opt. Lett. 36, 2842-2844 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-15-2842


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