Diffraction of circularly polarized light from near-field optical probes

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Diffracted fields from 100-mm aperture near-field scanning optical microscopy (NSOM) probes and uncoated tapered fibres are measured and analysed. Using a solid angle scanner, the two-dimensional intensity distribution and polarization state of the diffracted light are resolved experimentally. Polarization analyses show that circularly polarized input light does not maintain its polarization state for all diffraction angles, and is completely filtered into linearly polarized light at large polar diffraction angles. This drastic decomposition originates from the vector nature of light diffracted by the sub-wavelength aperture. There is a fundamental difficulty in generating circularly polarized light near the aperture of NSOM probes owing to polarization-dependent diffraction in the near-field regime. This is illustrated by the Bethe-Bouwkamp model using circularly polarized input light.
Publisher
BLACKWELL SCIENCE LTD
Issue Date
1999
Language
English
Article Type
Article; Proceedings Paper
Citation

JOURNAL OF MICROSCOPY-OXFORD, v.194, pp.2 - 3

ISSN
0022-2720
URI
http://hdl.handle.net/10203/20450
Appears in Collection
PH-Journal Papers(저널논문)
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