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Proceedings Paper

Novel fabrication technique of hybrid structure lens array for 3D images
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Paper Abstract

Tunable liquid lens arrays can produce three dimensional images by using electrowetting principle that alters surface tensions by applying voltage. This method has advantages of fast response time and low power consumption. However, it is challenging to fabricate a high fill factor liquid lens array and operate three dimensional images which demand high diopter. This study describes a hybrid structure lens array which has not only a liquid lens array but a solid lens array. A concave-shape lens array is unavoidable when using only the liquid lens array and some voltages are needed to make the lens flat. By placing the solid lens array on the liquid lens array, initial diopter can be positive. To fabricate the hybrid structure lens array, a conventional lithographic process in semiconductor manufacturing is needed. A negative photoresist SU-8 was used as chamber master molds. PDMS and UV adhesive replica molding are done sequentially. Two immiscible liquids, DI water and dodecane, are injected in the fabricated chamber, followed by sealing. The fabricated structure has a 20 by 20 pattern of cylindrical shaped circle array and the aperture size of each lens is 1mm. The thickness of the overall hybrid structure is about 2.8mm. Hybrid structure lens array has many advantages. Solid lens array has almost 100% fill factor and allow high efficiency. Diopter can be increased by more than 200 and negative diopter can be shifted to the positive region. This experiment showed several properties of the hybrid structure and demonstrated its superiority.

Paper Details

Date Published: 14 March 2016
PDF: 6 pages
Proc. SPIE 9759, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics IX, 97591A (14 March 2016); doi: 10.1117/12.2210765
Show Author Affiliations
Junsik Lee, KAIST (Korea, Republic of)
Junoh Kim, KAIST (Korea, Republic of)
Cheoljoong Kim, KAIST (Korea, Republic of)
Dooseub Shin, KAIST (Korea, Republic of)
Gyohyun Koo, KAIST (Korea, Republic of)
Yong Hyub Won, KAIST (Korea, Republic of)


Published in SPIE Proceedings Vol. 9759:
Advanced Fabrication Technologies for Micro/Nano Optics and Photonics IX
Georg von Freymann; Winston V. Schoenfeld; Raymond C. Rumpf, Editor(s)

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