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Title: A liquid-filled tunable double-focus microlens
Authors: Yu, H.B. 
Zhou, G.Y. 
Chau, F.K. 
Lee, F.W.
Wang, S.H.
Leung, H.M.
Issue Date: 16-Mar-2009
Citation: Yu, H.B., Zhou, G.Y., Chau, F.K., Lee, F.W., Wang, S.H., Leung, H.M. (2009-03-16). A liquid-filled tunable double-focus microlens. Optics Express 17 (6) : 4782-4790. ScholarBank@NUS Repository.
Abstract: A novel microlens design with tunable double-focus is presented. It is fabricated by adding only one SU-8 photolithography step to the welldeveloped liquid-filled microlens fabrication process. The thickness of this layer determines the thickness difference between the central and peripheral region of the membrane, the deformation of which is used to define the surface profile of the microlens. The stepped thickness variation is finally manifested as the difference in deformation contour at two different regions of the membrane when subjected to uniform applied pressure, thereby causing two focal lengths to appear. Experimental and simulation results are presented, from which the tunability of the focal lengths of the double-focus microlens is demonstrated to be effective over a wide range through combining the structural design with pressure control. The successful demonstration of this unconventional microlens design concept will potentially extend the application of liquid-filled microlens technology. © 2009 Optical Society of America.
Source Title: Optics Express
ISSN: 10944087
DOI: 10.1364/OE.17.004782
Appears in Collections:Staff Publications

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