光电镊子中的操作模式与物理现象
Operational Regimes and Physics Present in Optoelectronic Tweezers.
作者信息
Valley Justin K, Jamshidi Arash, Ohta Aaron T, Hsu Hsan-Yin, Wu Ming C
机构信息
The authors are with the Electrical Engineering and Computer Science Department, Berkeley Sensor and Actuator Center, University of California, Berkeley, CA 94720 USA.
出版信息
J Microelectromech Syst. 2008 Apr;17(2):342-350. doi: 10.1109/JMEMS.2008.916335.
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.
光电镊子（OET）是一种强大的基于光的技术，用于操纵微米和纳米级颗粒。除了光学图案化的介电泳（DEP）力外，OET装置中还会出现其他光诱导的电动和热效应。在本文中，我们对OET操作过程中存在的各种流体、光学和电学效应进行了全面的理论和实验研究。这些效应包括DEP、光诱导交流电渗、电热流和浮力驱动流。我们对这些效应进行了有限元建模，以确定给定一组器件参数和偏置条件下的主导模式。这些结果通过实验得到了证实，并给出了OET装置工作状态的全面概述。
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