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Proceedings Paper

Electrowetting liquid lens array on curved substrates for wide field of view image sensor
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Paper Abstract

In this research, electrowetting liquid lens array on curved substrates is developed for wide field of view image sensor. In the conventional image sensing system, this lens array is usually in the form of solid state. However, in this state, the lens array which is similar to insect-like compound eyes in nature has several limitations such as degradation of image quality and narrow field of view because it cannot adjust focal length of lens. For implementation of the more enhanced system, the curved array of lenses based on electrowetting effect is developed in this paper, which can adjust focal length of lens. The fabrication of curved lens array is conducted upon the several steps, including chamber fabrication, electrode & dielectric layer deposition, liquid injection, and encapsulation. As constituent materials, IZO coated convex glass, UV epoxy (NOA 68), DI water, and dodecane are used. The number of lenses on the fabricated panel is 23 by 23 and each lens has 1mm aperture with 1.6mm pitch between adjacent lenses. When the voltage is applied on the device, it is observed that each lens is changed from concave state to convex state. From the unique optical characteristics of curved array of liquid lenses such as controllable focal length and wide field of view, we can expect that it has potential applications in various fields such as medical diagnostics, surveillance systems, and light field photography.

Paper Details

Date Published: 21 March 2016
PDF: 7 pages
Proc. SPIE 9705, Microfluidics, BioMEMS, and Medical Microsystems XIV, 970508 (21 March 2016); doi: 10.1117/12.2212032
Show Author Affiliations
Yousung Bang, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Muyoung Lee, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Yong Hyub Won, Korea Advanced Institute of Science and Technology (Korea, Republic of)


Published in SPIE Proceedings Vol. 9705:
Microfluidics, BioMEMS, and Medical Microsystems XIV
Bonnie L. Gray; Holger Becker, Editor(s)

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