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Applied Optics

Applied Optics


  • Vol. 38, Iss. 1 — Jan. 1, 1999
  • pp: 160–167

Characterization of trapping force on metallic Mie particles

Pu Chun Ke and Min Gu  »View Author Affiliations

Applied Optics, Vol. 38, Issue 1, pp. 160-167 (1999)

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Transverse trapping force on three types of metallic Mie particles (gold, nickel, and silver) is measured for different values of the numerical aperture of an objective used for trapping. The experimental results are compared with those calculated with a modified ray-optics model. It is found that, unlike the situation for a trapped dielectric particle, the maximum transverse trapping efficiency for a trapped metallic particle is increased with the numerical aperture of the trapping objective. After consideration of radiometric force, which is caused by the heating effect, and spherical aberration, which is induced by the refractive-index mismatch, the measured results agree well with the theoretical prediction. The magnitude of the radiometric force is approximately ten times stronger than the maximum transverse trapping force.

© 1999 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation

Original Manuscript: July 13, 1998
Revised Manuscript: September 28, 1998
Published: January 1, 1999

Pu Chun Ke and Min Gu, "Characterization of trapping force on metallic Mie particles," Appl. Opt. 38, 160-167 (1999)

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