Answers are grounded in this paper and cite their sources.
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.
No takes yet. Share an insight, caveat, or question.
Wood et al. (2007) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: