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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 36, Iss. 13 — Jul. 1, 2011
  • pp: 2471–2473

Generation of an axially super-resolved quasi-spherical focal spot using an amplitude-modulated radially polarized beam

Han Lin, Baohua Jia, and Min Gu  »View Author Affiliations


Optics Letters, Vol. 36, Issue 13, pp. 2471-2473 (2011)
http://dx.doi.org/10.1364/OL.36.002471


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Abstract

An axially super-resolved quasi-spherical focal spot can be generated by focusing an amplitude-modulated radially polarized beam through a high numerical aperture objective. A method based on the unique depolarization pro perties of a circular focus is proposed to design the amplitude modulation. The generated focal spot shows a ratio of x y z = 1 1 1.48 for the normalized FWHM in three dimensions, compared to that of x y z = 1 0.74 1.72 under linear polarization (in the x direction) illumination. Moreover, the focusable light efficiency of the designed amplitude-modulated beam is 65%, which is more than 3 times higher than the optimized case under linear polarization and thus make the amplitude-modulated radial polarization beam more suitable for a wide range of applications.

© 2011 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(220.1230) Optical design and fabrication : Apodization

ToC Category:
Diffraction and Gratings

History
Original Manuscript: April 13, 2011
Manuscript Accepted: May 16, 2011
Published: June 22, 2011

Citation
Han Lin, Baohua Jia, and Min Gu, "Generation of an axially super-resolved quasi-spherical focal spot using an amplitude-modulated radially polarized beam," Opt. Lett. 36, 2471-2473 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-13-2471

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