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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 13 — Jun. 22, 2009
  • pp: 10998–11006

Liquid-crystal variable-focus lenses with a spatially-distributed tilt angles

Michinori Honma, Toshiaki Nose, Satoshi Yanase, Rumiko Yamaguchi, and Susumu Sato  »View Author Affiliations

Optics Express, Vol. 17, Issue 13, pp. 10998-11006 (2009)

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A pretilt angle controlling method by the density of rubbings using a tiny stylus is proposed. The control of the surface pretilt angle is achieved by rubbing a side-chain type polyimide film for a homeotropic alignment. Smooth liquid crystal (LC) director distribution in the bulk layer is successfully obtained even though the rough surface orientation. This approach is applied to LC cylindrical and rectangular lenses with a variable-focusing function. The distribution profile of the rubbing pitch (the reciprocal of the rubbing density) for small aberration is determined to be quadratic. The variable focusing function is successfully achieved in the LC rectangular lens, and the voltage dependence of the focal length is tried to be explained by the LC molecular reorientation behavior.

© 2009 OSA

OCIS Codes
(160.3710) Materials : Liquid crystals
(220.3630) Optical design and fabrication : Lenses
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Optical Design and Fabrication

Original Manuscript: April 22, 2009
Revised Manuscript: June 7, 2009
Manuscript Accepted: June 8, 2009
Published: June 17, 2009

Michinori Honma, Toshiaki Nose, Satoshi Yanase, Rumiko Yamaguchi, and Susumu Sato, "Liquid-crystal variable-focus lenses with a spatially-distributed tilt angles," Opt. Express 17, 10998-11006 (2009)

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