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Proceedings Paper

Optically controlled hydrodynamic micro-manipulation
Author(s): David B. Phillips; Luke Debono; Stephen H. Simpson; Miles J. Padgett
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Paper Abstract

The ability to precisely manipulate micro- and nano-scale objects has been a major driver in the progression of nanotechnologies. In this proceedings we describe a form of micro-manipulation in which the position of a target object can be controlled via locally generated fluid flow, created by the motion of nearby optically trapped objects. The ability to do this relies on a simple principle: when an object is moved through a fluid, it displaces the surrounding fluid in a predictable manner, resulting in controllable hydrodynamic forces exerted on adjacent objects. Therefore, by moving optically trapped actuators using feedback in response to a target object's current position, the flow-field at the target can be dynamically controlled. Here we investigate the performance of such a system using stochastic Brownian dynamics simulations, which are based on numerical integration of the Langevin equation describing the evolution of the system, using the Rotne-Praga approximation to capture hydrodynamic interactions. We show that optically controlled hydrodynamic micro-manipulation has the potential to hold target objects in place, move them along prescribed trajectories, and damp their Brownian motion, using the indirect forces of the surrounding water alone.

Paper Details

Date Published: 25 August 2015
PDF: 8 pages
Proc. SPIE 9548, Optical Trapping and Optical Micromanipulation XII, 95481A (25 August 2015); doi: 10.1117/12.2191341
Show Author Affiliations
David B. Phillips, Univ. of Glasgow (United Kingdom)
Luke Debono, Univ. of Bristol (United Kingdom)
Stephen H. Simpson, Institute of Scientific Instruments of the ASCR, v.v.i. (Czech Republic)
Miles J. Padgett, Univ. of Glasgow (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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