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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 10 — May. 15, 2010
  • pp: 1494–1496

Optimal beam diameter for optical tweezers

Akbar Samadi and Nader S. Reihani  »View Author Affiliations

Optics Letters, Vol. 35, Issue 10, pp. 1494-1496 (2010)

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An optimized optical trap is a favorable choice for nanoparticle trapping and micromanipulation of biological tissues. The collimation of laser beam before the objective can have significant influence on the trap by controlling the effective NA of the system. We have shown by both theory and experiment that in the aberration-free condition the filling factor of W D 0.67 provides the strongest trap in the lateral directions for a micrometer-size bead. In this condition improvements up to 117 % ( 168 % ) , compared with the previously suggested ratio of W D 1 ( W D 1.25 ) , were achieved in the lateral direction.

© 2010 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Lasers and Laser Optics

Original Manuscript: November 19, 2009
Revised Manuscript: February 26, 2010
Manuscript Accepted: March 29, 2010
Published: May 4, 2010

Virtual Issues
Vol. 5, Iss. 10 Virtual Journal for Biomedical Optics

Akbar Samadi and Nader S. Reihani, "Optimal beam diameter for optical tweezers," Opt. Lett. 35, 1494-1496 (2010)

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  19. Throughout the Letter the improvements are calculated by comparison to the reference values: Improvement percentage=newvalue-referencevalue∕referencevalue×100, e.g., 168% improvement would be 2.68 as large as the reference value.

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