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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 10 — May. 16, 2005
  • pp: 3673–3680

Numerical modeling of optical levitation and trapping of the “stuck” particles with a pulsed optical tweezers

Jian-liao Deng, Qing Wei, Yu-zhu Wang, and Yong-qing Li  »View Author Affiliations

Optics Express, Vol. 13, Issue 10, pp. 3673-3680 (2005)

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We present the theoretical analysis and the numerical modeling of optical levitation and trapping of the stuck particles with a pulsed optical tweezers. In our model, a pulsed laser was used to generate a large gradient force within a short duration that overcame the adhesive interaction between the stuck particles and the surface; and then a low power continuous-wave (cw) laser was used to capture the levitated particle. We describe the gradient force generated by the pulsed optical tweezers and model the binding interaction between the stuck beads and glass surface by the dominative van der Waals force with a randomly distributed binding strength. We numerically calculate the single pulse levitation efficiency for polystyrene beads as the function of the pulse energy, the axial displacement from the surface to the pulsed laser focus and the pulse duration. The result of our numerical modeling is qualitatively consistent with the experimental result.

© 2005 Optical Society of America

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

ToC Category:
Research Papers

Original Manuscript: March 24, 2005
Revised Manuscript: April 25, 2005
Published: May 16, 2005

Jian-liao Deng, Qing Wei, Yu-zhu Wang, and Yong-qing Li, "Numerical modeling of optical levitation and trapping of the �??stuck�?? particles with a pulsed optical tweezers," Opt. Express 13, 3673-3680 (2005)

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