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Signal reconstruction from a scanning near-field optical microscopy approach curve.

Authors
  • Barchiesi, Dominique
  • Grosges, Thomas
Type
Published Article
Journal
Optics Express
Publisher
The Optical Society
Publication Date
Aug 22, 2005
Volume
13
Issue
17
Pages
6519–6526
Identifiers
PMID: 19498667
Source
Medline
License
Unknown

Abstract

Scanning Near-field Optical Microscopies suffer from the low signal to noise ratio, due to the smallness of the diffracting probe used to get images. Therefore a lock-in amplifier is commonly used to perform homodyne detection. From the lock-in data, we reconstruct the near-field intensity diffracted by the probe-end in the case of approach curves. We show that the reconstructed and the detected signals can strongly differ. The reconstruction of the signal is necessary to give physical interpretation.

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