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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 19 — Sep. 13, 2010
  • pp: 19495–19503

Theory of enhanced optical transmission through a metallic nano-slit surrounded with asymmetric grooves under oblique incidence

Lin Cai, Guangyuan Li, Feng Xiao, Zhonghua Wang, and Anshi Xu  »View Author Affiliations

Optics Express, Vol. 18, Issue 19, pp. 19495-19503 (2010)

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A metallic nano-slit surrounded with asymmetric grooves is proposed as the plasmonic concentrator for oblique incident light. A theoretical model based on the surface plasmon polariton (SPP) coupled-mode method is derived for the extraordinary optical transmission (EOT) through such a structure under oblique incidence. The model is quantitatively validated with the finite element method. With the model, the physical insight of the EOT is then interpreted, i.e., the major contributions to the transmission include the vertical Fabry-Perot resonance of the slit, and the interference among slit modes excited by the incident light, by SPPs generated from groove arrays and their first-order reflections. This is quite different from the EOT through a nano-slit surrounded with symmetric grooves under normal incidence.

© 2010 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Diffraction and Gratings

Original Manuscript: June 29, 2010
Revised Manuscript: August 19, 2010
Manuscript Accepted: August 19, 2010
Published: August 30, 2010

Lin Cai, Guangyuan Li, Feng Xiao, Zhonghua Wang, and Anshi Xu, "Theory of enhanced optical transmission through a metallic nano-slit surrounded with asymmetric grooves under oblique incidence," Opt. Express 18, 19495-19503 (2010)

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