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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 10 — May. 10, 2010
  • pp: 10896–10904

Extraordinary transmission through a single coaxial aperture in a thin metal film

P. Banzer, J. Kindler (née Müller), S. Quabis, U. Peschel, and G. Leuchs  »View Author Affiliations

Optics Express, Vol. 18, Issue 10, pp. 10896-10904 (2010)

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We investigate experimentally the transmission properties of single sub-wavelength coaxial apertures in thin metal films (t = 110 nm). Enhanced transmission through a single sub-wavelength coaxial aperture illuminated with a strongly focused radially polarized light beam is reported. In our experiments we achieved up to four times enhanced transmission through a single coaxial aperture as compared to a (hollow) circular aperture with the same outer diameter. We attribute this enhancement of transmission to the excitation of a TEM-mode for illumination with radially polarized light inside the single coaxial aperture. A strong polarization contrast is observed between the transmission for radially and azimuthally polarized illumination. Furthermore, the observed transmission through a single coaxial aperture can be strongly reduced if surface plasmons are excited. The experimental results are in good agreement with finite difference time domain (FDTD) simulations.

© 2010 Optical Society of America

OCIS Codes
(230.7370) Optical devices : Waveguides
(240.0310) Optics at surfaces : Thin films
(240.6680) Optics at surfaces : Surface plasmons
(260.5430) Physical optics : Polarization

Original Manuscript: February 8, 2010
Revised Manuscript: March 25, 2010
Manuscript Accepted: March 25, 2010
Published: May 10, 2010

Virtual Issues
Unconventional Polarization States of Light (2010) Optics Express

Peter Banzer, Jochen Kindler, Susanne Quabis, Ulf Peschel, and Gerd Leuchs, "Extraordinary transmission through a single coaxial aperture in a thin metal film," Opt. Express 18, 10896-10904 (2010)

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