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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 31, Iss. 2 — Feb. 1, 2014
  • pp: 253–257

Manipulation of radial-variant polarization for creating tunable bifocusing spots

Bing Gu, Yang Pan, Jia-Lu Wu, and Yiping Cui  »View Author Affiliations


JOSA A, Vol. 31, Issue 2, pp. 253-257 (2014)
http://dx.doi.org/10.1364/JOSAA.31.000253


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Abstract

We propose and generate a new radial-variant vector field (RV-VF) with a distribution of states of polarization described by the square of the radius and exploit its focusing property. Theoretically, we present the analytical expressions for the three-dimensional electric field of the vector field focused by a thin lens under the nonparaxial and paraxial approximations based on the vectorial Rayleigh–Sommerfeld formulas. Numerical simulations indicate that this focused field exhibits bifocusing spots along the optical axis. The underlying mechanism for generating the bifocusing property is analyzed in detail. We give the analytical formula for the interval between two foci. Experimentally, we generate the RV-VFs with alterable topological charge and demonstrate that the interval between two foci is controllable by tuning the radial topological charge. This particular focal field has specific applications for biparticle trapping, manipulating, alignment, transportation, and accelerating along the optical axis.

© 2014 Optical Society of America

OCIS Codes
(260.1960) Physical optics : Diffraction theory
(260.5430) Physical optics : Polarization
(350.5500) Other areas of optics : Propagation

ToC Category:
Physical Optics

History
Original Manuscript: September 13, 2013
Revised Manuscript: November 5, 2013
Manuscript Accepted: November 29, 2013
Published: January 10, 2014

Citation
Bing Gu, Yang Pan, Jia-Lu Wu, and Yiping Cui, "Manipulation of radial-variant polarization for creating tunable bifocusing spots," J. Opt. Soc. Am. A 31, 253-257 (2014)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-31-2-253


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