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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 5 — May. 5, 2009

Extraordinary optical absorption through subwavelength slits

Justin S. White, Georgios Veronis, Zongfu Yu, Edward S. Barnard, Anu Chandran, Shanhui Fan, and Mark L. Brongersma  »View Author Affiliations


Optics Letters, Vol. 34, Issue 5, pp. 686-688 (2009)
http://dx.doi.org/10.1364/OL.34.000686


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Abstract

We report on the ability of resonant plasmonic slits to efficiently concentrate electromagnetic energy into a nanoscale volume of absorbing material placed inside or directly behind the slit. This gives rise to extraordinary optical absorption characterized by an absorption enhancement factor that well exceeds the enhancements seen for extraordinary optical transmission through slits. A semianalytic Fabry–Perot model for the resonant absorption is developed and shown to quantitatively agree with full-field simulations. We show that absorption enhancements of nearly 1000% can be realized at 633 nm for slits in aluminum films filled with silicon. This effect can be utilized in a wide range of applications, including high-speed photodetectors, optical lithography and recording, and biosensors.

© 2009 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(260.5740) Physical optics : Resonance

ToC Category:
Physical Optics

History
Original Manuscript: December 5, 2008
Revised Manuscript: January 23, 2009
Manuscript Accepted: January 26, 2009
Published: February 27, 2009

Virtual Issues
Vol. 4, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Justin S. White, Georgios Veronis, Zongfu Yu, Edward S. Barnard, Anu Chandran, Shanhui Fan, and Mark L. Brongersma, "Extraordinary optical absorption through subwavelength slits," Opt. Lett. 34, 686-688 (2009)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ol-34-5-686


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