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Journal of Nanophotonics

Field enhancement at metallic interfaces due to quantum confinement
Author(s): Z. Fatih Öztürk; Sanshui Xiao; Min Yan; Martijn Wubs; Antti-Pekka Jauho; Niels A. Mortensen
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Paper Abstract

We point out an apparently overlooked consequence of the boundary conditions obeyed by the electric displacement vector at air-metal interfaces: the continuity of the normal component combined with the quantum mechanical penetration of the electron gas in the air implies the existence of a surface on which the dielectric function vanishes. This, in turn, leads to an enhancement of the normal component of the total electric field. We study this effect for a planar metal surface, with the inhomogeneous electron density accounted for by a Jellium model. We also illustrate the effect for equilateral triangular nanoislands via numerical solutions of the appropriate Maxwell equations, and show that the field enhancement is several orders of magnitude larger than what the conventional theory predicts.

Paper Details

Date Published: 1 January 2011
PDF: 10 pages
J. Nanophoton. 5(1) 051602 doi: 10.1117/1.3574159
Published in: Journal of Nanophotonics Volume 5, Issue 1
Show Author Affiliations
Z. Fatih Öztürk, Technical Univ. of Denmark (Netherlands)
Sanshui Xiao, Technical Univ. of Denmark (Denmark)
Min Yan, Technical Univ. of Denmark (Denmark)
Martijn Wubs, Technical Univ. of Denmark (Denmark)
Antti-Pekka Jauho, Aalto Univ. School of Science and Technology (Finland)
Niels A. Mortensen, Technical Univ. of Denmark (Denmark)

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