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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 1, Iss. 6 — Jun. 13, 2006

Apertureless scanning near-field optical microscopy: a comparison between homodyne and heterodyne approaches

Lewis Gomez, Renaud Bachelot, Alexandre Bouhelier, Gary P. Wiederrecht, Shih-hui Chang, Stephen K. Gray, Feng Hua, Seokwoo Jeon, John A. Rogers, Miguel E. Castro, Sylvain Blaize, Ilan Stefanon, Gilles Lerondel, and Pascal Royer  »View Author Affiliations


JOSA B, Vol. 23, Issue 5, pp. 823-833 (2006)
http://dx.doi.org/10.1364/JOSAB.23.000823


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Abstract

In coherent homodyne apertureless scanning near-field optical microscopy (ASNOM) the background field cannot be fully suppressed because of the interference between the different collected fields, making the images difficult to interpret. We show that implementing the heterodyne version of ASNOM allows one to overcome this issue. We present a comparison between homodyne and heterodyne ASNOM through near-field analysis of gold nanowells, integrated waveguides, and a single evanescent wave generated by total internal reflection. The heterodyne approach allows for the control of the interferometric effect with the background light. In particular, the undesirable background is shown to be replaced by a controlled reference field. As a result, near-field information undetectable by a homodyne ASNOM is extracted by use of the heterodyne approach. Additionally, it is shown that field amplitude and field phase can be detected separately.

© 2006 Optical Society of America

OCIS Codes
(110.2990) Imaging systems : Image formation theory
(180.5810) Microscopy : Scanning microscopy

ToC Category:
Imaging Systems

History
Original Manuscript: July 15, 2005
Revised Manuscript: September 26, 2005
Manuscript Accepted: October 17, 2005

Virtual Issues
Vol. 1, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Lewis Gomez, Renaud Bachelot, Alexandre Bouhelier, Gary P. Wiederrecht, Shih-hui Chang, Stephen K. Gray, Feng Hua, Seokwoo Jeon, John A. Rogers, Miguel E. Castro, Sylvain Blaize, Ilan Stefanon, Gilles Lerondel, and Pascal Royer, "Apertureless scanning near-field optical microscopy: a comparison between homodyne and heterodyne approaches," J. Opt. Soc. Am. B 23, 823-833 (2006)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josab-23-5-823


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