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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 1, Iss. 1 — Jan. 17, 2006

Anomalous phenomenon of a focused evanescent Laguerre-Gaussian beam

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

Optics Express, Vol. 13, Issue 25, pp. 10360-10366 (2005)

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We demonstrate theoretically and experimentally an anomaly in the intensity distribution at the focal region of a Laguerre-Gaussian beam, when such a beam is focused by a high numerical aperture objective lens through an index-mismatched interface satisfying the total internal reflection condition. An asymmetric rotation of the focal field arising from the interplay of the phase shift induced by the total internal reflection and the helical phase of the Laguerre-Gaussian beam has been experimentally observed by a scanning near-field optical microscope. A cross-section analysis shows that the experimental results match well with the theoretical predictions.

© 2005 Optical Society of America

OCIS Codes
(110.0180) Imaging systems : Microscopy
(140.7010) Lasers and laser optics : Laser trapping
(230.3720) Optical devices : Liquid-crystal devices
(260.1960) Physical optics : Diffraction theory

ToC Category:
Research Papers

Virtual Issues
Vol. 1, Iss. 1 Virtual Journal for Biomedical Optics

Baohua Jia, Xiaosong Gan, and Min Gu, "Anomalous phenomenon of a focused evanescent Laguerre-Gaussian beam," Opt. Express 13, 10360-10366 (2005)

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