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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 30 — Oct. 20, 2007
  • pp: 7544–7551

Generating radial or azimuthal polarization by axial sampling of circularly polarized vortex beams

K. J. Moh, X.-C. Yuan, J. Bu, R. E. Burge, and Bruce Z. Gao  »View Author Affiliations


Applied Optics, Vol. 46, Issue 30, pp. 7544-7551 (2007)
http://dx.doi.org/10.1364/AO.46.007544


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Abstract

A laser beam with circular polarization can be converted into either radial or azimuthal polarization by a microfabricated spiral phase plate and a radial (or azimuthal)-type linear analyzer. The resulting polarization is axially symmetric and is able to produce tightly focused light fields beyond the diffraction limit. We describe in detail the theory behind the technique and the experimental verification of the polarization both in the far field and at the focus of a high numerical aperture lens. Vector properties of the beam under strong focusing conditions were observed by comparing the fluorescence images corresponding to the focal intensity distribution for both radial and azimuthal polarizations. The technique discussed here may easily be implemented to a wide range of optical instruments and devices that require the use of tightly focused light beams.

© 2007 Optical Society of America

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(180.0180) Microscopy : Microscopy
(260.5430) Physical optics : Polarization

ToC Category:
Physical Optics

History
Original Manuscript: May 10, 2007
Revised Manuscript: July 20, 2007
Manuscript Accepted: July 13, 2007
Published: October 18, 2007

Virtual Issues
Vol. 2, Iss. 11 Virtual Journal for Biomedical Optics

Citation
K. J. Moh, X.-C. Yuan, J. Bu, R. E. Burge, and Bruce Z. Gao, "Generating radial or azimuthal polarization by axial sampling of circularly polarized vortex beams," Appl. Opt. 46, 7544-7551 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-30-7544


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