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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 6 — Mar. 24, 2014
  • pp: 6653–6660

Application of flat-top focus to 2D trapping of large particles

Hao Chen and K. C. Toussaint, Jr.  »View Author Affiliations

Optics Express, Vol. 22, Issue 6, pp. 6653-6660 (2014)

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The 2D optical trapping ability of larger-than average-particles is compared for three different beam types: a flat-top, a Gaussian beam, and a donut shaped beam. Optical force-displacement curves are calculated in four different size regimes of particle diameters (1.5-20 μm). We find that the trapping efficiency increases linearly with ratio of particle diameter to wavelength for all three beams. As the ratio reaches a specific threshold value, the flat-top focus exhibits the largest trapping efficiency compared to the other two beam types. We experimentally demonstrate that flat-top focusing provides the largest transverse trapping efficiency for particles as large as 20 μm in diameter for our given experimental conditions. The overall trend in our experimental results follows that observed in our simulation model. The results from this study could facilitate light manipulation of large particles.

© 2014 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(260.5430) Physical optics : Polarization
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Optical Trapping and Manipulation

Original Manuscript: December 11, 2013
Revised Manuscript: February 18, 2014
Manuscript Accepted: February 20, 2014
Published: March 14, 2014

Virtual Issues
Vol. 9, Iss. 5 Virtual Journal for Biomedical Optics

Hao Chen and K. C. Toussaint, "Application of flat-top focus to 2D trapping of large particles," Opt. Express 22, 6653-6660 (2014)

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