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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 3 — Jan. 31, 2011
  • pp: 2187–2192

Transmission resonances of compound metallic gratings with two subwavelength slits in each period

Dong Xiang, Ling-Ling Wang, Xiao-Fei Li, Liu Wang, Xiang Zhai, Zhong-He Liu, and Wei-Wei Zhao  »View Author Affiliations


Optics Express, Vol. 19, Issue 3, pp. 2187-2192 (2011)
http://dx.doi.org/10.1364/OE.19.002187


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Abstract

Based on the finite-difference time-domain method, we investigate the transmission resonances of compound metallic gratings with two subwavelength slits filled with different dielectrics inside each period in the visible and near infrared regions. The results show that the transmission spectrum is almost a compound of that of two corresponding simple gratings expect for the transmission feature at a certain resonant wavelength, where the Fabry-Pérot (FP)-like phenomena have been found both inside the two slits, but the orders of the FP-like modes are different. If the order of the FP-like mode inside one slit is one bigger than inside the other, the intensity of the transmission will be significantly weakened. We attribute this phenomenon to the phase resonance because the phases at the exits of the two slits are opposite to each other.

© 2011 OSA

OCIS Codes
(120.7000) Instrumentation, measurement, and metrology : Transmission
(240.6680) Optics at surfaces : Surface plasmons
(260.5740) Physical optics : Resonance

ToC Category:
Optics at Surfaces

History
Original Manuscript: November 29, 2010
Revised Manuscript: December 24, 2010
Manuscript Accepted: December 24, 2010
Published: January 20, 2011

Citation
Dong Xiang, Ling-Ling Wang, Xiao-Fei Li, Liu Wang, Xiang Zhai, Zhong-He Liu, and Wei-Wei Zhao, "Transmission resonances of compound 
metallic gratings with two subwavelength 
slits in each period," Opt. Express 19, 2187-2192 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-3-2187


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