| Info. | Vol.1 - No.4 (2007.12.20) |
|---|---|
| Title | Optoelectronic Manipulation of Microparticles Using Double Photoconductive Layers on a Liquid Crystal Display |
| Authors | Hyundoo Hwang1, Youngjae Oh1, Jae-Jun Kim1,Wonjae Choi1, Se-Hwan Kim2, Jin Jang2 & Je-Kyun Park1 |
| Institutions | 1Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Korea 2Department of Information Display, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Korea Correspondence and requests for materials should be addressed to J.-K. Park (jekyun@kaist.ac.kr) |
| Abstract | This paper describes a novel platform for the optoelectronic manipulation of micro-particles termed a three-dimensional optoelectronic tweezers (3D OET) and comp-osed of double photoconductive layers. The 3D OET has been successfully utilized for focusing polystyrene beads onto the middle of a liquid chamber using negative dielectrophoresis (DEP). As a result, the microparticles are segregated from the device surface, thus preventing the adsorption by non-specific surface-particle interactions which were shown to occur in a typical OET device. We have com-pared the performance of 3D OET to typical OET based on a liquid crystal display (LCD) with several parameters, such as LCD image patterns, bead sizes and processing times. The 3D OET has a higher particle trapping efficiency and less particle adsorption rate than typical OET. Our novel platform would be a useful tool for manipulating microparticles, including live cells and polymer beads. |
| Keyword | Dielectrophoresis, Optoelectronic tweezers, Liquid crystal display (LCD), Microfluidics |
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