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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 18 — Sep. 5, 2005
  • pp: 6821–6827

Direct measurement of a radially polarized focused evanescent field facilitated by a single LCD

Baohua Jia, Xiaosong Gan, and Min Gu  »View Author Affiliations

Optics Express, Vol. 13, Issue 18, pp. 6821-6827 (2005)

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In this paper, a tightly focused evanescent field produced by a total internal reflection objective lens under the illumination of a radially polarized beam generated using a single liquid crystal phase modulator is investigated. The field distributions have been directly mapped by a scanning near-field optical microscope. It is demonstrated both theoretically and experimentally that the introduction of radially polarized beam illumination combining with an annular beam illumination exhibits advantages in two aspects. On one hand, it corrects the focus elongation and splitting in a focused evanescent field associated with a linearly polarized beam. On the other hand, it significantly improves the lateral localization to approximately a quarter of the illumination wavelength, which is less than half of the size that is achievable under linearly polarized illumination.

© 2005 Optical Society of America

OCIS Codes
(110.0180) Imaging systems : Microscopy
(230.3720) Optical devices : Liquid-crystal devices
(260.1960) Physical optics : Diffraction theory

ToC Category:
Research Papers

Original Manuscript: July 20, 2005
Revised Manuscript: August 19, 2005
Published: September 5, 2005

Baohua Jia, Xiaosong Gan, and Min Gu, "Direct measurement of a radially polarized focused evanescent field facilitated by a single LCD," Opt. Express 13, 6821-6827 (2005)

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