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Nanoscale Res Lett. 2013 Jul 16;8(1):326. doi: 10.1186/1556-276X-8-326.

Free-field characterization via directional transmission through a nanoaperture.

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1
Department of Physics and Mathematics, University of Eastern Finland, P,O, Box 111, Joensuu FI-80101, Finland. rahomaki@kth.se.

Abstract

: We propose a scheme based on extraordinary transmission of light through a single nanoaperture, surrounded by periodic corrugations, for direct characterization of focal-region optical fields with subwavelength-scale structure. We describe the design of the device on the basis of rigorous diffraction theory and fabricate a prototype using a process that involves electron beam lithography, dry etching, and template stripping. First experimental results performed with a transmission-type confocal optical microscope demonstrate the potential of the method.

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