Phys. Rev. E 70, 010901(R) (2004) [4 pages]

Sorting mesoscopic objects with periodic potential landscapes: Optical fractionation

Abstract

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K. Ladavac, K. Kasza, and D. G. Grier^*
Department of Physics, James Franck Institute and Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois 60637, USA

Received 17 June 2003; revised 22 March 2004; published 20 July 2004

Viscously damped objects driven through a periodically modulated potential energy landscape can become kinetically locked in to commensurate directions through the landscape, and thus can be deflected away from the driving direction. We demonstrate that the threshold for an object to become kinetically locked in to an array can depend exceptionally strongly on its size. When implemented with an array of holographic optical tweezers, this process provides the basis for a continuous and continuously optimized sorting technique for mesoscopic objects called “optical fractionation.”

URL:

http://link.aps.org/doi/10.1103/PhysRevE.70.010901

DOI:

10.1103/PhysRevE.70.010901

PACS:

87.80.Cc, 33.80.Ps, 05.60.Cd, 82.70.Dd

^*Present address: Department of Physics, New York University, New York, NY 10003, USA.

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Phys. Rev. E 70, 010901(R) (2004) [4 pages]

Sorting mesoscopic objects with periodic potential landscapes: Optical fractionation