Operational Regimes and Physics Present in Optoelectronic Tweezers

Author

Valley, Justin K. ; Jamshidi, Arash ; Ohta, Aaron T. ; Hsu, Hsan-Yin ; Wu, Ming C.

Author_Institution

Univ. of California, Berkeley

Volume

17

Issue

2

fYear

2008

fDate

4/1/2008 12:00:00 AM

Firstpage

342

Lastpage

350

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.

Keywords

finite element analysis; optoelectronic devices; buoyancy-driven flow; dielectrophoresis force; electroosmosis; electrothermal flow; finite-element modeling; light-induced electrokinetic; microscopic particle manipulation; nanoscopic particle manipulation; operational regimes; optoelectronic tweezer; Biomedical optical imaging; Conductivity; Dielectrophoresis; Electrodes; Glass; Nanobioscience; Optical devices; Optical sensors; Physics; Voltage; Dielectrophoresis (DEP); electrothermal (ET) flow; light-induced ac electroosmosis (LACE); optoelectronic tweezers (OET);

fLanguage

English

Journal_Title

Microelectromechanical Systems, Journal of

Publisher

ieee

ISSN

1057-7157

Type

jour

DOI

10.1109/JMEMS.2008.916335

Filename

4481164