Table of Contents
Advances in OptoElectronics
Volume 2011, Article ID 375451, 10 pages
Research Article

Electrodes for Microfluidic Integrated Optoelectronic Tweezers

1Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095, USA
2Department of Neurology, University of Southern California, Los Angeles, CA 90033, USA
3Chimei-Innolux Inc., Tainan County, Southern Taiwan Science Park 744, Taiwan

Received 11 May 2011; Accepted 25 June 2011

Academic Editor: Aaron T. Ohta

Copyright © 2011 Kuo-Wei Huang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We report on two types of electrodes that enable the integration of optoelectronic tweezers (OETs) with multilayer poly(dimethylsilane)- (PDMS-) based microfluidic devices. Both types of electrodes, Au-mesh and single-walled carbon nanotube- (SWNT-) embedded PDMS thin film, are optically transparent, electrically conductive, and can be mechanically deformed and provide interfaces to form strong covalent bonding between an OET device and PDMS through standard oxygen plasma treatment. Au-mesh electrodes provide high electrical conductivity and high transparency but are lack of flexibility and allow only small deformation. On the other hand, SWNT-embedded PDMS thin film electrodes provide not only electrical conductivity but also optical transparency and can undergo large mechanical deformation repeatedly without failure. This enables, for the first time, microfluidic integrated OET with on-chip valve and pump functions, which is a critical step for OET-based platforms to conduct more complex and multistep biological and biochemical analyses.