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Open AccessArticle

Biconvex Polymer Microlenses with Tunable Imaging Properties Designed by Janus Droplet Microfluidics

Precision and Intelligence Laboratory, Tokyo Institute of Technology, R2-6, 4259 Nagatsuta-cho, Midori-ku,Yokohama, Kanagawa 226-8503, Japan
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Academic Editors: Andrew deMello and Xavier Casadevall i Solvas
Micromachines 2015, 6(10), 1435-1444; https://doi.org/10.3390/mi6101428
Received: 26 August 2015 / Revised: 17 September 2015 / Accepted: 22 September 2015 / Published: 29 September 2015
(This article belongs to the Special Issue Droplet Microfluidics: Techniques and Technologies)
This work presents a technique for fabricating biconvex polymer microlenses using microfluidics, and then evaluates their tunable optical properties. A glass microfluidic channel was employed to rapidly mass-produce nanoliter-sized biphasic Janus droplets, which consist of a biconvex segment of a photocurable monomer and a concave-convex segment of a non-curable silicone oil that contained a surfactant. Subsequent photopolymerization produces polymeric biconvex spherical microlenses with templated dual curvatures. By changing the flow-rate ratios of the photocurable and non-curable droplet phases in the microfluidic channel, the radii of curvature of the two lens surfaces and the thicknesses of the resultant microlenses can be varied. The resulting biconvex microlenses with different shapes were used in image projection experiments. Different magnification properties were observed, and were consistent with the properties estimated quantitatively from the geometrical parameters of the lenses. View Full-Text
Keywords: microfluidics; Janus droplet; biconvex microlens; interfacial tension microfluidics; Janus droplet; biconvex microlens; interfacial tension
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Nisisako, T.; Suzuki, H.; Hatsuzawa, T. Biconvex Polymer Microlenses with Tunable Imaging Properties Designed by Janus Droplet Microfluidics. Micromachines 2015, 6, 1435-1444.

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