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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 19 — Sep. 13, 2010
  • pp: 19510–19521

Anomalous optical absorption in metallic gratings with subwavelength slits

Ruey-Lin Chern, Yu-Tang Chen, and Hoang-Yan Lin  »View Author Affiliations

Optics Express, Vol. 18, Issue 19, pp. 19510-19521 (2010)

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The absorption in metallic gratings with subwavelength slits is theoretically investigated. Anomalous optical absorption occurs over a wide range of incident angles for TM and TE polarizations with different geometric parameters. In particular, a nearly perfect absorbance up to 99.5% with a significant bandwidth is attained for TM polarization with compound slits. Enhanced absorption is associated with extreme concentration of fields inside the structure. The respective field pattern depicts a special feature of surface plasmons excited on single interface only, which are identified as semibonding modes. The anomalous absorption is also achieved for TE polarization, when the compound grating is reduced to a simple grating. For this polarization, the anomalous absorption is attributed to the occurrence of trapped modes, with a slightly smaller absorbance (98.4%).

© 2010 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(300.1030) Spectroscopy : Absorption

ToC Category:
Diffraction and Gratings

Original Manuscript: July 2, 2010
Revised Manuscript: August 8, 2010
Manuscript Accepted: August 20, 2010
Published: August 30, 2010

Ruey-Lin Chern, Yu-Tang Chen, and Hoang-Yan Lin, "Anomalous optical absorption in metallic gratings with subwavelength slits," Opt. Express 18, 19510-19521 (2010)

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