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Dynamically adjustable three-dimensional gray masks operated by electrostatic force modulation for the fabrication of microlens arrays in microchannels

[+] Author Affiliations
Shih-Hao Huang

National Taiwan Ocean University, Department of Mechanical and Mechatronic Engineering and Center for Marine Bioenvironment and Biotechnology, No. 2, Beining Road, Keelung, 202-24, Taiwan

Zheng-Yu Yu

National Taiwan Ocean University, Department of Mechanical and Mechatronic Engineering, No. 2, Beining Road, Keelung, 202-24, Taiwan

Chia-Kai Lin

National Taiwan Ocean University, Department of Mechanical and Mechatronic Engineering, No. 2, Beining Road, Keelung, 202-24, Taiwan

Kuo-Yung Hung

Mingchi University of Technology, Institute of Mechanical and Electrical Engineering, Taipei, 243-01, Taiwan

J. Micro/Nanolith. MEMS MOEMS. 9(4), 043002 (December 07, 2010). doi:10.1117/1.3497586
History: Received May 26, 2010; Revised August 11, 2010; Accepted August 23, 2010; Published December 07, 2010; Online December 07, 2010
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We propose a new approach to fabricating micro-optical elements, in particular, microlenses and microlens arrays using an adjustable gray-scale mask and a microfluidic conveyor module. A liquid with acrylate oligomer is photopolymerized while it flows through this module, thus forming the micro-optical components. The adjustable gray-scale mask contains a layer filled with a UV-absorbing liquid and transparent elastomer structures in the shape of microlenses. By applying a high voltage, the shape of these microlenses can be altered, enabling one to change the intensity transmission distribution of the gray-scale mask and, as a consequence, the surface profile of the corresponding microlens structures in the microfluidic conveyor module below. The produced microlens structures are washed out of the conveyor module without adhesion on the walls of the PDMS microchannel surfaces due to the existence of an oxygen-aided inhibition layer. The dependence of the produced microlens morphology on the index-matching oil, the concentration of UV-absorbing liquids, and the electrostatic force modulation of the adjustable gray-scale mask are characterized. The adjustable gray-scale mask combined with a suitable flow/stop sequence enables one to fabricate microlenses and microlens arrays in a continuous and high-throughput mode.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Shih-Hao Huang ; Zheng-Yu Yu ; Chia-Kai Lin and Kuo-Yung Hung
"Dynamically adjustable three-dimensional gray masks operated by electrostatic force modulation for the fabrication of microlens arrays in microchannels", J. Micro/Nanolith. MEMS MOEMS. 9(4), 043002 (December 07, 2010). ; http://dx.doi.org/10.1117/1.3497586


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