Optical Properties of a Nanosized Hole in a Thin Metallic Film

Tae-Ho Park, Nikolay Mirin, J. Britt Lassiter, Colleen L. Nehl, Naomi J. Halas and Peter Nordlander*
† Department of Physics and Astronomy, M.S. 61
‡ Department of Chemistry, M.S. 60
§ Department of Electrical and Computer Engineering, M.S. 366
Laboratory for Nanophotonics, Rice University, Houston, Texas 77005-1892
ACS Nano, 2008, 2 (1), pp 25–32
DOI: 10.1021/nn700292y
Publication Date (Web): January 9, 2008
Copyright © 2008 American Chemical Society
* Address correspondence to nordland@rice.edu.

Abstract

Abstract Image

Subwavelength holes are one of the most important structures in nanophotonics, providing a useful geometry for nanosensing and giving rise to extraordinary transmission when patterned in arrays. Here we theoretically and experimentally examine the optical properties of an individual nanohole in a thin metallic film. In contrast to localized plasmonic nanostructures with their own characteristic resonances, nanoholes provide a site for excitation of the underlying thin film surface plasmons. We show that both hole diameter and film thickness determine the energy of the optical resonance. A theoretical dispersion curve was obtained and verified using spectral measurements of individual nanoholes.

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History

  • Published In Issue January 22, 2008
  • Article ASAPJanuary 09, 2008
  • Received: October 10, 2007
    Accepted: December 06, 2007

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