25 August 2015 Optically controlled hydrodynamic micro-manipulation
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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.
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David B. Phillips, David B. Phillips, Luke Debono, Luke Debono, Stephen H. Simpson, Stephen H. Simpson, Miles J. Padgett, Miles J. Padgett, } "Optically controlled hydrodynamic micro-manipulation", Proc. SPIE 9548, Optical Trapping and Optical Micromanipulation XII, 95481A (25 August 2015); doi: 10.1117/12.2191341; https://doi.org/10.1117/12.2191341
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