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Appl Opt. 2003 Dec 1;42(34):6811-5.

Enhanced confined light transmission by single subwavelength apertures in metallic films.

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  • 1Laboratoire d'Optique P. M. Duffieux, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 6603, Institut de Microtechniques de Franche-Comté, Université de Franche-Comté, Besançon Cedex 25030, France.


The diffraction of light that emerges from a metallic circular aperture is studied. Near- and far-field results are presented. Spectral angular transmitted intensities are performed versus the incident wavelength for four kinds of aperture. It is shown that, for a definite configuration, a large enhancement of transmission--compared with the basic case of a single hole--occurs combined with a spectacular angular confinement of light. Such effects are, for example, of great interest in optical near-field microscopy for which the probe is a nanosource.

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