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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 6 — Mar. 16, 2009
  • pp: 4782–4790

A liquid-filled tunable double-focus microlens

H. B. Yu, G. Y. Zhou, F. K. Chau, F. W. Lee, S. H. Wang, and H. M. Leung  »View Author Affiliations


Optics Express, Vol. 17, Issue 6, pp. 4782-4790 (2009)
http://dx.doi.org/10.1364/OE.17.004782


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Abstract

A novel microlens design with tunable double-focus is presented. It is fabricated by adding only one SU-8 photolithography step to the well-developed 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

OCIS Codes
(220.3630) Optical design and fabrication : Lenses
(230.4685) Optical devices : Optical microelectromechanical devices
(110.1080) Imaging systems : Active or adaptive optics

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: November 11, 2008
Revised Manuscript: December 20, 2008
Manuscript Accepted: January 9, 2009
Published: March 11, 2009

Virtual Issues
Vol. 4, Iss. 5 Virtual Journal for Biomedical Optics

Citation
H. B. Yu, G. Y. Zhou, F. S. Chau, F. W. Lee, S. H. Wang, and H. M. Leung, "A liquid-filled tunable double-focus microlens," Opt. Express 17, 4782-4790 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-6-4782


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