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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 5 — May. 5, 2009

Tight focusing of vortex beams in presence of primary astigmatism

Rakesh Kumar Singh, P. Senthilkumaran, and Kehar Singh  »View Author Affiliations


JOSA A, Vol. 26, Issue 3, pp. 576-588 (2009)
http://dx.doi.org/10.1364/JOSAA.26.000576


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Abstract

The tight focusing of vortex carrying beams is studied using the Debye–Wolf diffraction integral in the presence of primary astigmatism. The roles of topological charge, polarization distribution of the input beam, and handedness of the beam polarization are investigated in the intensity distribution of the focal plane of a high-numerical-aperture lens. The effect of tight focusing in the presence of astigmatism on the dark core of the azimuthally polarized beam is also investigated and compared with the dark core of a circularly polarized vortex beam. The effect of an aberration has been discussed in the context of the fluorescent spot size in the focal plane of a stimulated emission depletion microscope for two different polarization setups.

© 2009 Optical Society of America

OCIS Codes
(110.0180) Imaging systems : Microscopy
(140.0140) Lasers and laser optics : Lasers and laser optics
(260.0260) Physical optics : Physical optics
(260.5430) Physical optics : Polarization
(080.4865) Geometric optics : Optical vortices

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 20, 2008
Revised Manuscript: December 12, 2008
Manuscript Accepted: December 20, 2008
Published: February 19, 2009

Virtual Issues
Vol. 4, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Rakesh Kumar Singh, P. Senthilkumaran, and Kehar Singh, "Tight focusing of vortex beams in presence of primary astigmatism," J. Opt. Soc. Am. A 26, 576-588 (2009)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josaa-26-3-576

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