25 August 2015 Optically controlled hydrodynamic micro-manipulation
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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.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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