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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 25 — Dec. 6, 2010
  • pp: 26325–26331

Electrically switchable liquid crystal Fresnel lens using UV-modified alignment film

Shie-Chang Jeng, Shug-June Hwang, Jing-Shyang Horng, and Kuo-Ren Lin  »View Author Affiliations

Optics Express, Vol. 18, Issue 25, pp. 26325-26331 (2010)

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A simple method to make a switchable liquid crystal (LC) Fresnel lens with high diffraction efficiency and a low driving voltage was proposed based on the photo-induced surface modification of the vertical alignment layer. UV illumination alters the pretilt angle of alignment layers, a Fresnel zone-distribution hybrid alignment in the homeotropic LC cell can be straightforwardly achieved through UV exposure, yielding a concentric structure of the Fresnel phase LC lens. A remarkable diffraction efficiency of ~31.4%, close to the measured diffraction efficiency of the used Fresnel-zone-plate mask of 32%, was detected using a linearly polarized incident beam.

© 2010 OSA

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(160.3710) Materials : Liquid crystals
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Diffraction and Gratings

Original Manuscript: September 28, 2010
Revised Manuscript: November 12, 2010
Manuscript Accepted: November 15, 2010
Published: December 1, 2010

Shie-Chang Jeng, Shug-June Hwang, Jing-Shyang Horng, and Kuo-Ren Lin, "Electrically switchable liquid crystal Fresnel lens using UV-modified alignment film," Opt. Express 18, 26325-26331 (2010)

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