Spectral analysis of resonant transmission of light through a single sub-wavelength slit

We analyze the spectral properties of resonant transmission of light through a sub-wavelength slit in a metal film. We show that the enhanced transmission can be understood in terms of interfering surface-wave-like modes propagating in the slit. We characterize the effect of geometrical and material...

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Bibliographic Details
Published inOptics express Vol. 12; no. 4; pp. 623 - 632
Main Authors Lindberg, Jari, Lindfors, K, Setälä, T, Kaivola, M, Friberg, A
Format Journal Article
LanguageEnglish
Published United States 2004
Subjects
aperture
boundary-element method
extraordinary optical-transmission
hole arrays
metallic gratings
nanoparticles
near-field
sensors
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Summary:We analyze the spectral properties of resonant transmission of light through a sub-wavelength slit in a metal film. We show that the enhanced transmission can be understood in terms of interfering surface-wave-like modes propagating in the slit. We characterize the effect of geometrical and material properties of the slit on the transmission spectrum. Furthermore, we show that the wavelength of the transmission resonance strongly depends on the surrounding medium. This effect may be utilized in sensors, imaging, and the detection of, e.g. biomolecules.
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ISSN:1094-4087
1094-4087
DOI:10.1364/opex.12.000623