標題: Liquid Lenses and Driving Mechanisms: A Review
作者: Chiu, Cheng-Pu
Chiang, Tsai-Jung
Chen, Jem-Kun
Chang, Feng-Chih
Ko, Fu-Hsiang
Chu, Chih-Wei
Kuo, Shiao-Wei
Fan, Shih-Kang
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Liquid lens;electrowetting;electrowetting-on-dielectric;EWOD
公開日期: 2012
摘要: In this paper, we discuss liquid lenses driven by various mechanisms. By properly designing the device structure and choosing the optimal materials, the liquid lenses offer great potential for practical uses. The driving mechanism dictates the application and performance of the liquid lenses. Here we categorize the driving mechanisms into mechanical and electrical ones. In general, mechanical driving with an elastic membrane and an external pump drives liquids in a cavity by controlling the hydraulic pressure. The mechanical driving method can be applied to most of the liquids, but the application of the electrical driving method would be limited by the conductivity or the permittivity of the liquids. Therefore, the properties of the different liquids, e. g., dielectric liquids, liquid crystal molecules, and conductive liquids, deeply affect the mechanism we may choose to realize a liquid lens. Among various electrical methods, dielectrophoresis (DEP), electrostatic forces, and electrowetting-on-dielectric (EWOD) are emphasized here for driving dielectric liquids, liquid crystal molecules, and conductive liquids, respectively. DEP deforms the liquid lenses when the permittivities are different between the liquid and the medium. Electrostatic force orients the liquid crystal molecules to follow the applied electric field. Electrowetting-driven liquid lenses change their focal lengths by altering the contact angle. Here we show the designs and the structures of liquid lenses to describe their mechanisms, performances and feasibilities. It is worth mentioning that the liquid lenses using electrowetting have been commercialized. No moving parts would be the most important reason to use electrical manipulations rather than mechanical ones. (C) Koninklijke Brill NV, Leiden, 2011
URI: http://hdl.handle.net/11536/16966
http://dx.doi.org/10.1163/156856111X600514
ISSN: 0169-4243
DOI: 10.1163/156856111X600514
期刊: JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
Volume: 26
Issue: 12-17
起始頁: 1773
結束頁: 1788
顯示於類別:期刊論文


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  1. 000307931900003.pdf