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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 15 — Jul. 26, 2004
  • pp: 3377–3382

Trapping metallic Rayleigh particles with radial polarization

Qiwen Zhan  »View Author Affiliations

Optics Express, Vol. 12, Issue 15, pp. 3377-3382 (2004)

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Metallic particles are generally considered difficult to trap due to strong scattering and absorption forces. In this paper, numerical studies show that optical tweezers using radial polarization can stably trap metallic particles in 3-dimension. The extremely strong axial component of a highly focused radially polarized beam provides a large gradient force. Meanwhile, this strong axial field component does not contribute to the Poynting vector along the optical axis. Consequently, it does not create axial scattering/absorption forces. Owing to the spatial separation of the gradient force and scattering/absorption forces, a stable 3-D optical trap for metallic particles can be formed.

© 2004 Optical Society of America

OCIS Codes
(020.7010) Atomic and molecular physics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(260.5430) Physical optics : Polarization

ToC Category:
Research Papers

Original Manuscript: April 15, 2004
Revised Manuscript: July 7, 2004
Published: July 26, 2004

Qiwen Zhan, "Trapping metallic Rayleigh particles with radial polarization," Opt. Express 12, 3377-3382 (2004)

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