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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 7, Iss. 12 — Dec. 19, 2012

A combination of concave/convex surfaces for field-enhancement optimization: the indented nanocone

Aitzol García-Etxarri, Peter Apell, Mikael Käll, and Javier Aizpurua  »View Author Affiliations

Optics Express, Vol. 20, Issue 23, pp. 25201-25212 (2012)

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We introduce a design strategy to maximize the Near Field (NF) enhancement near plasmonic antennas. We start by identifying and studying the basic electromagnetic effects that contribute to the electric near field enhancement. Next, we show how the concatenation of a convex and a concave surface allows merging all the effects on a single, continuous nanoantenna. As an example of this NF maximization strategy, we engineer a nanostructure, the indented nanocone. This structure, combines all the studied NF maximization effects with a synergistic boost provided by a Fano-like interference effect activated by the presence of the concave surface. As a result, the antenna exhibits a NF amplitude enhancement of ∼ 800, which transforms into ∼1600 when coupled to a perfect metallic surface. This strong enhancement makes the proposed structure a robust candidate to be used in field enhancement based technologies. Further elaborations of the concept may produce even larger and more effective enhancements.

© 2012 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(300.6340) Spectroscopy : Spectroscopy, infrared
(250.5403) Optoelectronics : Plasmonics
(240.6695) Optics at surfaces : Surface-enhanced Raman scattering

ToC Category:
Optics at Surfaces

Original Manuscript: May 31, 2012
Revised Manuscript: October 5, 2012
Manuscript Accepted: October 6, 2012
Published: October 22, 2012

Virtual Issues
Vol. 7, Iss. 12 Virtual Journal for Biomedical Optics

Aitzol García-Etxarri, Peter Apell, Mikael Käll, and Javier Aizpurua, "A combination of concave/convex surfaces for field-enhancement optimization: the indented nanocone," Opt. Express 20, 25201-25212 (2012)

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