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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 24 — Nov. 19, 2012
  • pp: 26837–26844

Rotatable diffractive gratings based on hybrid-aligned cholesteric liquid crystals

Chi-Huang Lin, Ru-Hsien Chiang, Shu-Hao Liu, Chie-Tong Kuo, and Chi-Yen Huang  »View Author Affiliations


Optics Express, Vol. 20, Issue 24, pp. 26837-26844 (2012)
http://dx.doi.org/10.1364/OE.20.026837


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Abstract

This work proposes a thermally rotatable grating that is based on hybrid-aligned cholesteric liquid crystals (HBA-cholesteric LCs). Experiments reveal that the HBA-cholesteric texture has a uniformly striped domain, which forms a grating, when the ratio of the cell gap to the helical pitch (d/p) is in the range of 2≤d/p≤3. The stripe direction of the HBA-cholesteric grating is predicted by the proposed vertically aligned LC layer model. The stripe direction of the HBA-cholesteric grating rotates continuously under thermal and electrical effects. Furthermore, the HBA-cholesteric grating has a larger rotational angle under the thermal effect (~101°) than under the electrical effect (~48°). Potential applications of the proposed thermally rotatable cholesteric grating for beam steering devices are emphasized.

© 2012 OSA

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Diffraction and Gratings

History
Original Manuscript: August 30, 2012
Revised Manuscript: October 11, 2012
Manuscript Accepted: October 22, 2012
Published: November 13, 2012

Citation
Chi-Huang Lin, Ru-Hsien Chiang, Shu-Hao Liu, Chie-Tong Kuo, and Chi-Yen Huang, "Rotatable diffractive gratings based on hybrid-aligned cholesteric liquid crystals," Opt. Express 20, 26837-26844 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-24-26837


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