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Proceedings Paper

Correlated fluctuations of optically trapped particles
Author(s): Thomas J. Smart; Christopher J. Richards; Xiang Han; Stefan Siwiak-Jaszek; Philip H. Jones
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Paper Abstract

We present a study of correlated Brownian fluctuations between optically confined particles in a number of different configurations. First we study colloidal particles held in separate optical tweezers. In this configuration the particles are known to interact through their hydrodynamic coupling, leading to a pronounced anti-correlation in their position fluctuations at short times. We study this system and the behavior of the correlated motion when the trapped particles are subject to an external force such as viscous drag. The second system considered is a chain of optically bound particles in an evanescent wave surface trap. In this configuration the particles interact both through hydrodynamic and optical coupling. Using digital video microscopy and subsequent particle tracking analysis we study the thermal motion of the chain and map the covariance of position fluctuations between pairs of particles in the chain. The experiments are complemented by Brownian motion simulations.

Paper Details

Date Published: 25 August 2015
PDF: 7 pages
Proc. SPIE 9548, Optical Trapping and Optical Micromanipulation XII, 954823 (25 August 2015); doi: 10.1117/12.2190820
Show Author Affiliations
Thomas J. Smart, Univ. College London (United Kingdom)
Christopher J. Richards, Univ. College London (United Kingdom)
Xiang Han, Univ. College London (United Kingdom)
National Univ. of Defense Technology (China)
Stefan Siwiak-Jaszek, Univ. College London (United Kingdom)
Philip H. Jones, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 9548:
Optical Trapping and Optical Micromanipulation XII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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