Characterization of microparticles with driven optical tweezers

Tiffany A. Wood; G. Seth Roberts; Sarayoot Eaimkhong; Paul Bartlett

doi:10.1039/B703994H

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Faraday Discussions

Issue 0, 2008

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Characterization of microparticles with driven optical tweezers

Tiffany A. Wood , G. Seth Roberts , Sarayoot Eaimkhong and Paul Bartlett

Faraday Discuss., 2008, 137, 319-333

DOI: 10.1039/B703994H
Received 16 Mar 2007, Accepted 03 Apr 2007
First published on the web 16 Jul 2007
This article is part of the collection: The Spectroscopy and Dynamics of Microparticles

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Abstract
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We discuss how actively-driven optical tweezers may be used to characterize Brownian microparticles. Two experiments are described in detail. We follow the thermal fluctuations of a charged particle in an oscillatory electric field and demonstrate that charges as low as a few elementary charges can be measured accurately and reproducibly. Secondly, we measure the orientational dynamics of a trapped rotating droplet and use circular polarimetry within optical tweezers to determine in situ birefringence.

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Characterization of microparticles with driven optical tweezers

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