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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 5 — May. 17, 2007

Numerical study of an apertureless near field scanning optical microscope probe under radial polarization illumination

Weibin Chen and Qiwen Zhan  »View Author Affiliations

Optics Express, Vol. 15, Issue 7, pp. 4106-4111 (2007)

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An axially symmetric three-dimensional finite element method model is applied to investigate the electromagnetic field distribution in the vicinity of a silver coated glass tip. Under radially polarized illumination, a strongly enhanced field located at the apex of the tip is found due to the constructive interference of surface plasmon propagating at the air/silver interface. The enhancement factor and surface plasmon resonance excitation are analyzed systematically. The optimal condition for field enhancement is investigated through the exploration of different taper angles of the tip and the illumination geometry. The numerical studies show that a significantly enhanced localized electromagnetic field with a full-width-half-maximum of 10 nm is obtainable with 632.8 nm optical excitation.

© 2007 Optical Society of America

OCIS Codes
(180.5810) Microscopy : Scanning microscopy
(240.6680) Optics at surfaces : Surface plasmons
(260.5430) Physical optics : Polarization

ToC Category:

Original Manuscript: January 16, 2007
Revised Manuscript: February 27, 2007
Manuscript Accepted: March 12, 2007
Published: April 2, 2007

Virtual Issues
Vol. 2, Iss. 5 Virtual Journal for Biomedical Optics

Weibin Chen and Qiwen Zhan, "Numerical study of an apertureless near field scanning optical microscope probe under radial polarization illumination," Opt. Express 15, 4106-4111 (2007)

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