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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: Stephen A. Burns
  • Vol. 24, Iss. 6 — Jun. 1, 2007
  • pp: 1793–1798

Sharper focal spot formed by higher-order radially polarized laser beams

Yuichi Kozawa and Shunichi Sato  »View Author Affiliations


JOSA A, Vol. 24, Issue 6, pp. 1793-1798 (2007)
http://dx.doi.org/10.1364/JOSAA.24.001793


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Abstract

The intensity distributions near the focal point for radially polarized laser beams including higher-order transverse modes are calculated based on vector diffraction theory. For higher-order radially polarized mode beams as well as a fundamental mode ( R - TEM 01 * ) beam, the strong longitudinal component forms a sharper spot at the focal point under a high-NA focusing condition. In particular, double-ring-shaped radially polarized mode ( R - TEM 11 * ) beams can effectively reduce the focal spot size because of destructive interference between the inner and the outer rings with π phase shift. Compared with an R - TEM 01 * beam focusing in a limit of NA = 1 , the full width at half-maximum values of the focal spot for an R - TEM 11 * beam are decreased by 13.6% for the longitudinal component and 25.8% for the total intensity.

© 2007 Optical Society of America

OCIS Codes
(050.1960) Diffraction and gratings : Diffraction theory
(140.3300) Lasers and laser optics : Laser beam shaping
(260.3160) Physical optics : Interference
(260.5430) Physical optics : Polarization

ToC Category:
Physical Optics

History
Original Manuscript: October 17, 2006
Manuscript Accepted: December 19, 2006
Published: May 9, 2007

Citation
Yuichi Kozawa and Shunichi Sato, "Sharper focal spot formed by higher-order radially polarized laser beams," J. Opt. Soc. Am. A 24, 1793-1798 (2007)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-24-6-1793


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