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Proceedings Paper

Plasmonic nanofocusing by axicon-shape Kretschmann configuration
Author(s): Atsushi Ono; Hiroki Sano; Wataru Inami; Keisuke Kato; Yoshimasa Kawata
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Paper Abstract

We designed and proposed a focusing device for the localization of photons in nanometric region by surface plasmon excitation. The focusing device is a metal-coated axicon prism. The cone angle of the prism and the metallic film thickness are designed to match the excitation conditions for Kretschmann configuration. A collimated Gaussian beam is irradiated to the prism and the excited surface plasmons propagate along the sides of the prism and converge at its apex. The resulting nanofocusing was investigated by the simulations and experiments of the intensity distributions around the apex of the prism. For incident radial polarization, a localized and field enhanced spot is generated by the constructive interference of surface plasmons. We observed the light scattered at the apex and the light reflected by the prism. Each polarized light of the radial, azimuthal, and linear provided field distributions of bright and dark intensities according to the surface plasmon excitation. We have demonstrated that surface plasmon waves are excited at the sides of the prism in the Kretschmann configuration and that they converge to its apex.

Paper Details

Date Published: 23 December 2011
PDF: 8 pages
Proc. SPIE 8204, Smart Nano-Micro Materials and Devices, 82041R (23 December 2011); doi: 10.1117/12.904738
Show Author Affiliations
Atsushi Ono, Shizuoka Univ. (Japan)
Japan Science and Technology Agency (Japan)
Hiroki Sano, Shizuoka Univ. (Japan)
Wataru Inami, Shizuoka Univ. (Japan)
Japan Science and Technology Agency (Japan)
Keisuke Kato, Shizuoka Univ. (Japan)
Yoshimasa Kawata, Japan Science and Technology Agency (Japan)
Shizuoka Univ. (Japan)

Published in SPIE Proceedings Vol. 8204:
Smart Nano-Micro Materials and Devices
Saulius Juodkazis; Min Gu, Editor(s)

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