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International Journal of Optics
Volume 2013 (2013), Article ID 253692, 13 pages
http://dx.doi.org/10.1155/2013/253692
Research Article

Generation of Bessel Surface Plasmon Polaritons in a Finite-Thickness Metal Film

B.I. Stepanov Institute of Physics of National Academy of Sciences of Belarus, 68 Nezavisimosti Avenue, 220072 Minsk, Belarus

Received 9 January 2013; Revised 11 March 2013; Accepted 23 March 2013

Academic Editor: Yu S. Kivshar

Copyright © 2013 S. N. Kurilkina et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A theory of generation of low- and high-index Bessel surface plasmon polaritons and their superposition in a metal film of a finite thickness is developed. Correct analytical expressions are obtained for the field of two families of Bessel surface plasmon polariton modes formed inside and outside the metal layer. The intensity distribution near the boundary of the layer has been calculated and analyzed. A scheme for the experimental realization of a superposition of Bessel surface plasmon polaritons is suggested. Our study demonstrates that it is feasible to use the superposition of Bessel surface plasmon polaritons as a virtual tip for near-field optical microscopy with a nanoscale resolution.