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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 25 — Dec. 7, 2009
  • pp: 22718–22725

Increasing trap stiffness with position clamping in holographic optical tweezers

Daryl Preece, Richard Bowman, Anna Linnenberger, Graham Gibson, Steven Serati, and Miles Padgett  »View Author Affiliations

Optics Express, Vol. 17, Issue 25, pp. 22718-22725 (2009)

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We present a holographic optical tweezers system capable of position clamping multiple particles. Moving an optical trap in response to the trapped object’s motion is a powerful technique for optical control and force measurement. We have now realised this experimentally using a Boulder Nonlinear Systems Spatial Light Modulator (SLM) with a refresh rate of 203Hz. We obtain a reduction of 44% in the variance of the bead’s position, corresponding to an increase in effective trap stiffness of 77%. This reduction relies on the generation of holograms at high speed. We present software capable of calculating holograms in under 1ms using a graphics processor unit.

© 2009 Optical Society of America

OCIS Codes
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(140.7010) Lasers and laser optics : Laser trapping
(230.6120) Optical devices : Spatial light modulators
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Optical Trapping and Manipulation

Original Manuscript: October 7, 2009
Revised Manuscript: November 16, 2009
Manuscript Accepted: November 18, 2009
Published: November 25, 2009

Virtual Issues
Vol. 5, Iss. 1 Virtual Journal for Biomedical Optics
December 7, 2009 Spotlight on Optics

Daryl Preece, Richard Bowman, Anna Linnenberger, Graham Gibson, Steven Serati, and Miles Padgett, "Increasing trap stiffness with position clamping in holographic optical tweezers," Opt. Express 17, 22718-22725 (2009)

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