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Chinese Optics Letters

Chinese Optics Letters

| PUBLISHED MONTHLY BY CHINESE LASER PRESS AND DISTRIBUTED BY OSA

  • Editor: Zhizhan Xu
  • Vol. 12, Iss. 1 — Jan. 1, 2014
  • pp: 011403–

Optimal beam diameter for lateral optical forces on microspheres at a water-air interface

Mincheng Zhong, Xi Wang, Jinhua Zhou, Ziqiang Wang, and Yinmei Li  »View Author Affiliations


Chinese Optics Letters, Vol. 12, Issue 1, pp. 011403- (2014)


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Abstract

Optical tweezers with a low numerical aperture microscope objective is used to manipulate the microspheres at the water-air interface. In this letter, we determine the optimal optical trap for the lateral manipulation of microspheres at a water-air interface. The experimental results show that the trapping force is influenced by the expansion of the trapping beam at the back aperture of the objective. The optimal filling ratio of 0.65 is suggested for lateral optical manipulation at the water-air interface. The lateral trapping forces at the water-air interface are theoretically investigated with the ray-optics model. The numerical results show that the lateral trapping forces can be changed by shrinking the diameter of the trapping laser beam. The numerical results are in accordance with the experimental results.

© 2014 Chinese Optics Letters

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(080.5692) Geometric optics : Ray trajectories in inhomogeneous media

ToC Category:
Lasers and Laser Optics

Citation
Mincheng Zhong, Xi Wang, Jinhua Zhou, Ziqiang Wang, and Yinmei Li, "Optimal beam diameter for lateral optical forces on microspheres at a water-air interface," Chin. Opt. Lett. 12, 011403- (2014)
http://www.opticsinfobase.org/col/abstract.cfm?URI=col-12-1-011403


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