Journal
OPTICS EXPRESS
Volume 17, Issue 25, Pages 22718-22725Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.022718
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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 1 ms using a graphics processor unit. (C) 2009 Optical Society of America
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