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In situ experimental study of a near-field lens at visible frequencies

Appl. Phys. Lett. 89, 193110 (2006); doi:10.1063/1.2387871

Published 8 November 2006

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G. Webb-Wood, A. Ghoshal, and P. G. Kik
College of Optics and Photonics: CREOL & FPCE, University of Central Florida, 4000 University Boulevard, Orlando, Florida 32816
Frequency dependent near-field scanning optical microscopy (NSOM) measurements of plasmon-mediated near-field focusing using a 50  nm thick Au film are presented. In these studies the tip aperture of a NSOM probe acts as a localized light source, while the near-field image formed by the metal lens is detected in situ using nanoscale scatterers placed in the image plane. By scanning the relative position of object and probe, the near-field image generated by the lens is resolved. NSOM scans performed at different illumination frequencies reveal an optimum near-field image quality at frequencies close to the surface plasmon resonance frequency. ©2006 American Institute of Physics
History: Received 18 May 2006; accepted 26 September 2006; published 8 November 2006
Permalink: http://link.aip.org/link/?APPLAB/89/193110/1
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KEYWORDS and PACS

Keywords
PACS
  • 07.79.Fc
    Near-field scanning optical microscopes
  • 42.79.Bh
    Optical lenses, prisms and mirrors
  • YEAR: 2006

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ISSN:
0003-6951 (print)   1077-3118 (online)
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