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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 19 — Sep. 10, 2012
  • pp: 21702–21714

Comparative study of total absorption of light by two-dimensional channel and hole array gratings

Anne-Laure Fehrembach and Evgeny Popov  »View Author Affiliations


Optics Express, Vol. 20, Issue 19, pp. 21702-21714 (2012)
http://dx.doi.org/10.1364/OE.20.021702


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Abstract

A detailed study of light absorption by silver gratings having two-dimensional periodicity is presented for structures constructed either of channels or of holes with subwavelength dimensions. Rigorous numerical modelling shows a systematic difference between the two structures: hole (cavity) gratings can strongly absorb light provided the cavity is sufficiently deep, when compared to the wavelength, whereas very thin channel gratings can induce total absorption. A detailed analysis is given in the limit when the period tends towards zero, and an explanation of the differences in behavior is presented using the properties of effective optical index of the metamaterial layer that substitutes the periodical structure in the limit when the period tend to zero.

© 2012 OSA

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(050.5745) Diffraction and gratings : Resonance domain

ToC Category:
Diffraction and Gratings

History
Original Manuscript: July 11, 2012
Revised Manuscript: August 21, 2012
Manuscript Accepted: August 21, 2012
Published: September 6, 2012

Citation
Anne-Laure Fehrembach and Evgeny Popov, "Comparative study of total absorption of light by two-dimensional channel and hole array gratings," Opt. Express 20, 21702-21714 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-19-21702


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