Improving the Mismatch between Light and Nanoscale Objects with Gold Bowtie Nanoantennas

P. J. Schuck, D. P. Fromm, A. Sundaramurthy, G. S. Kino, and W. E. Moerner
Phys. Rev. Lett. 94, 017402 – Published 13 January 2005

Abstract

Metallic bowtie nanoantennas should provide optical fields that are confined to spatial scales far below the diffraction limit. To improve the mismatch between optical wavelengths and nanoscale objects, we have lithographically fabricated Au bowties with lengths 75nm and gaps of tens of nm. Using two-photon-excited photoluminescence of Au, the local intensity enhancement factor relative to that for the incident diffraction-limited beam has been experimentally determined for the first time. Enhancements >103 occur for 20 nm gap bowties, in good agreement with theoretical simulations.

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  • Received 16 September 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.017402

©2005 American Physical Society

Authors & Affiliations

P. J. Schuck1, D. P. Fromm1, A. Sundaramurthy2, G. S. Kino2, and W. E. Moerner1

  • 1Department of Chemistry, Stanford University, Stanford, California 94305, USA
  • 2Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA

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Vol. 94, Iss. 1 — 14 January 2005

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