Characterisation of Microparticles with driven Optical Tweezers

Tiffany Wood, Paul Bartlett, Gregory Seth Roberts, Sarayoot Eaimkhong

Research output: Contribution to journalArticlepeer-review

Abstract

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
Original languageEnglish
Pages (from-to)319-333
Number of pages14
JournalFaraday Discussions
Volume137
Early online date16 Jul 2007
DOIs
Publication statusPublished - 2008

Keywords

  • OPTICAL TWEEZERS
  • BIREFRINGENCE
  • colloid

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