Optical tweezers as a force sensor for separating dielectrophoresis and AC electroosmosis forces

Jingyu Wang; H. Daniel Ou-Yang

doi:10.1117/12.860831

27 August 2010 Optical tweezers as a force sensor for separating dielectrophoresis and AC electroosmosis forces

Jingyu Wang, H. Daniel Ou-Yang

Proceedings Volume 7762, Optical Trapping and Optical Micromanipulation VII; 77621U (2010) https://doi.org/10.1117/12.860831
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

Abstract

Forces experienced by colloidal particles in an AC electric field such as dielectrophoresis (DEP) and AC electro-osmosis (ACEO) have been widely investigated for their application in microfluidic devices. In order to provide a more complete theoretical basis for such AC electrokinetic mechanisms, we propose a method to quantify the two forces upon one individual particle using optical tweezers as a force transducer and lock-in phase sensitive detection technique to allow high selectivity. Using this method, we isolated the ACEO force from the DEP force for charged polystyrene sphere in deionized (DI) water. ACEO free DEP crossover frequencies and a comprehensive 2D-mapping of the frequency dependent ACEO forces are presented in this paper.

Citation Download Citation

Jingyu Wang and H. Daniel Ou-Yang "Optical tweezers as a force sensor for separating dielectrophoresis and AC electroosmosis forces", Proc. SPIE 7762, Optical Trapping and Optical Micromanipulation VII, 77621U (27 August 2010); https://doi.org/10.1117/12.860831

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