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Nano Lett. 2006 Nov;6(11):2609-16.

Differential near-field scanning optical microscopy.

Author information

  • 1Wellman Center for Photomedicine, Harvard Medical School, Boston, Massachusetts 02114, USA. aozcan@mgh.harvard.edu

Abstract

We theoretically and experimentally illustrate a new apertured near-field scanning optical microscopy (NSOM) technique, termed differential NSOM (DNSOM). It involves scanning a relatively large (e.g., 0.3-2 mum wide) rectangular aperture (or a detector) in the near-field of an object and recording detected power as a function of the scanning position. The image reconstruction is achieved by taking a two-dimensional derivative of the recorded power map. Unlike conventional apertured NSOM, the size of the rectangular aperture/detector does not determine the resolution in DNSOM; instead, the resolution is practically determined by the sharpness of the corners of the rectangular aperture/detector. Principles of DNSOM can also be extended to other aperture/detector geometries such as triangles and parallelograms.

PMID:
17090100
[PubMed - indexed for MEDLINE]
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