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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 31, Iss. 2 — Jan. 15, 2006
  • pp: 149–151

Generation of a hollow dark spherical spot by 4 π focusing of a radially polarized Laguerre–Gaussian beam

Nándor Bokor and Nir Davidson  »View Author Affiliations

Optics Letters, Vol. 31, Issue 2, pp. 149-151 (2006)

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The properties of the focal spot for 4 π focusing with radially polarized first-order Laguerre–Gaussian beams are calculated. It is shown that a focal spot that has an extremely sharp dark region at the center and an almost-perfect spherical symmetry can be achieved. When such a hollow dark spherical spot is used in 4 π fluorescence depletion microscopy, an axial FWHM spot size of 39 nm and a transverse FWHM spot size of 64 nm can be achieved simultaneously in a practical system.

© 2006 Optical Society of America

OCIS Codes
(050.1960) Diffraction and gratings : Diffraction theory
(180.2520) Microscopy : Fluorescence microscopy
(220.2560) Optical design and fabrication : Propagating methods

ToC Category:
Diffraction and Gratings

Virtual Issues
Vol. 1, Iss. 2 Virtual Journal for Biomedical Optics

Nándor Bokor and Nir Davidson, "Generation of a hollow dark spherical spot by 4pi focusing of a radially polarized Laguerre-Gaussian beam," Opt. Lett. 31, 149-151 (2006)

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