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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 19 — Jul. 1, 2006
  • pp: 4576–4582

Optics InfoBase > Applied Optics > Volume 45 > Issue 19 > Page 4576

Electrically tunable lens based on a dual-frequency nematic liquid crystal

Oleg Pishnyak, Susumu Sato, and Oleg D. Lavrentovich  »View Author Affiliations


Applied Optics, Vol. 45, Issue 19, pp. 4576-4582 (2006)
http://dx.doi.org/10.1364/AO.45.004576


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Abstract

We report on an electrically controlled liquid-crystal-based variable optical lens filled with a dual-frequency nematic material. The lens design employs a hole-patterned electrode structure in a flat nematic cell. In order to decrease the lens switching time we maximize the dielectric torque by using a dual-frequency nematic material that is aligned at an angle approximately 45° with respect to the bounding plates by obliquely deposited SiO x , and by using an overdrive scheme of electrical switching. Depending on the frequency of the applied field, the director realigns either toward the homeotropic state (perpendicular to the substrates) or toward the planar state (parallel to the substrates), which allows one to control not only the absolute value of the focal length but also its sign. Optical performance of the liquid-crystal lens is close to that of an ideal thin lens.

© 2006 Optical Society of America

OCIS Codes
(110.2760) Imaging systems : Gradient-index lenses
(220.3630) Optical design and fabrication : Lenses
(230.3720) Optical devices : Liquid-crystal devices

History
Original Manuscript: September 26, 2005
Revised Manuscript: December 21, 2005
Manuscript Accepted: December 23, 2005

Virtual Issues
Vol. 1, Iss. 8 Virtual Journal for Biomedical Optics

Citation
Oleg Pishnyak, Susumu Sato, and Oleg D. Lavrentovich, "Electrically tunable lens based on a dual-frequency nematic liquid crystal," Appl. Opt. 45, 4576-4582 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-19-4576

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