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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 8 — Apr. 15, 2013
  • pp: 1331–1333

Minimized spot of annular radially polarized focusing beam

Liangxin Yang, Xiangsheng Xie, Sicong Wang, and Jianying Zhou  »View Author Affiliations

Optics Letters, Vol. 38, Issue 8, pp. 1331-1333 (2013)

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We have experimentally demonstrated the measurement of a tighter focal spot generated by a radially polarized narrow-width annular beam with the double-knife-edge method. The reconstructed spot profiles indicate that sharper focus cannot be achieved by shrinking the annular aperture further. The smallest focal spot (0.0711λ2) is obtained in experiment with an annular factor of 0.91. An apodization function has been introduced with the consideration of the diffraction effect, which achieves good agreement with the experimental data. Our result shows that the diffraction effect should be considered with small topography structures of the incident beam.

© 2013 Optical Society of America

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(110.1220) Imaging systems : Apertures

ToC Category:
Diffraction and Gratings

Original Manuscript: February 11, 2013
Revised Manuscript: March 17, 2013
Manuscript Accepted: March 18, 2013
Published: April 12, 2013

Liangxin Yang, Xiangsheng Xie, Sicong Wang, and Jianying Zhou, "Minimized spot of annular radially polarized focusing beam," Opt. Lett. 38, 1331-1333 (2013)

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