Increasing trap stiffness with position clamping in holographic optical tweezers

Daryl Preece, Richard Bowman, Anna Linnenberger, Graham M. Gibson, Steven Serati, Miles J. Padgett

Research output: Contribution to journalArticlepeer-review

65 Citations (SciVal)


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.

Original languageEnglish
Pages (from-to)22718-22725
Number of pages8
JournalOptics Express
Issue number25
Publication statusPublished - 7 Dec 2009

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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