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The degree of polarization of the scattered evanescent wave is measured with a laser-trapped particle for different incident angles. It is found that depolarization under s polarized beam illumination is stronger than that under p polarized beam illumination. As a result, the contrast of the evanescent wave interference pattern imaged in a particle-trapped near-field scanning optical microscope is improved approximately by a factor of 3 with a parallel analyzer under s polarized beam illumination. The phase shift of scattered evanescent waves under s and p polarized beam illumination is determined from the measured evanescent wave interference pattern. © 1999 American Institute of Physics.
Published in:
Applied Physics Letters
(Volume:75
,
Issue:
2
)
Date of Publication: Jul 1999
- Page(s):
- 175 - 177
- ISSN :
- 0003-6951
- Digital Object Identifier :
- 10.1063/1.124310
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 18 June 2009
- Issue Date :
- Jul 1999
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