Operational Regimes and Physics Present in Optoelectronic Tweezers
Valley, J.K.
Jamshidi, A.
Ohta, A.T.
Hsan-Yin Hsu
Wu, M.C.
Univ. of California, Berkeley;
This paper appears in: Microelectromechanical Systems, Journal of
Publication Date: April 2008
Volume: 17,
Issue: 2
On page(s): 342-350
ISSN: 1057-7157
INSPEC Accession Number: 9921032
Digital Object Identifier: 10.1109/JMEMS.2008.916335
Current Version Published: 2008-04-04
Abstract
Optoelectronic tweezers (OET) are a powerful light-based technique for the manipulation of micro- and nanoscopic particles. In addition to an optically patterned dielectrophoresis (DEP) force, other light-induced electrokinetic and thermal effects occur in the OET device. In this paper, we present a comprehensive theoretical and experimental investigation of various fluidic, optical, and electrical effects present during OET operation. These effects include DEP, light-induced ac electroosmosis, electrothermal flow, and buoyancy-driven flow. We present finite-element modeling of these effects to establish the dominant mode for a given set of device parameters and bias conditions. These results are confirmed experimentally and present a comprehensive outline of the operational regimes of the OET device.
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