arXiv 1004.26452010-04-15physics.optics

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

P. Banzer, J. Kindler, S. Quabis, U. Peschel, G. Leuchs

备注：: 9 pages, 5 figures, accepted by Optics Express
DOI：: 10.1364/OE.18.010896

英文摘要：

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.

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