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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 2 — Jan. 17, 2011
  • pp: 673–678

Shifting the spherical focus of a 4Pi focusing system

Shaohui Yan, Baoli Yao, and Romano Rupp  »View Author Affiliations

Optics Express, Vol. 19, Issue 2, pp. 673-678 (2011)

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In a 4Pi focusing system radially polarized laser beams can be focused to a spherical focal spot. For many applications, e.g., for moving trapped particles or for scanning a specimen, one would like to change the position of focal spot along the optical axis without moving lenses or laser beams. We demonstrate how this can be achieved by modulating the phase of the input field at the pupil plane of the lens. The required phase modulation function is determined by spherical wave expansion of the plane wave factors in the Richards–Wolf integral.

© 2011 OSA

OCIS Codes
(110.2990) Imaging systems : Image formation theory
(140.3300) Lasers and laser optics : Laser beam shaping
(260.5430) Physical optics : Polarization

ToC Category:
Physical Optics

Original Manuscript: October 8, 2010
Revised Manuscript: November 19, 2010
Manuscript Accepted: December 7, 2010
Published: January 5, 2011

Virtual Issues
Vol. 6, Iss. 2 Virtual Journal for Biomedical Optics

Shaohui Yan, Baoli Yao, and Romano Rupp, "Shifting the spherical focus of a 4Pi focusing system," Opt. Express 19, 673-678 (2011)

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