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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 4 — Feb. 15, 2014
  • pp: 834–837

Demonstration of flat-top focusing under radial polarization illumination

Hao Chen, Santosh Tripathi, and Kimani C. Toussaint, Jr.  »View Author Affiliations


Optics Letters, Vol. 39, Issue 4, pp. 834-837 (2014)
http://dx.doi.org/10.1364/OL.39.000834


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Abstract

We experimentally demonstrate the generation of a flat-top intensity distribution using a radially polarized vector beam. Our approach uses higher numerical aperture focusing than what has been previously reported for a single, fixed, vector beam. In addition, the flat-top focus generated in our scheme exhibits a polarization gradient along the radial coordinate in the focal volume, with an on-axis longitudinal field component that persists over 2λ, which is a stark difference from conventional flat-top fields, which exhibit intensity profiles that are uniformly polarized. Our experimental results are found to be in good agreement with the theoretical prediction.

© 2014 Optical Society of America

OCIS Codes
(140.3300) Lasers and laser optics : Laser beam shaping
(220.2740) Optical design and fabrication : Geometric optical design
(260.1960) Physical optics : Diffraction theory
(260.5430) Physical optics : Polarization

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: November 11, 2013
Revised Manuscript: December 18, 2013
Manuscript Accepted: January 5, 2014
Published: February 6, 2014

Citation
Hao Chen, Santosh Tripathi, and Kimani C. Toussaint, "Demonstration of flat-top focusing under radial polarization illumination," Opt. Lett. 39, 834-837 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-4-834


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