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Title: Field induced heliconical structure of cholesteric liquid crystal

A diffraction grating comprises a liquid crystal (LC) cell configured to apply an electric field through a cholesteric LC material that induces the cholesteric LC material into a heliconical state with an oblique helicoid director. The applied electric field produces diffracted light from the cholesteric LC material within the visible, infrared or ultraviolet. The axis of the heliconical state is in the plane of the liquid crystal cell or perpendicular to the plane, depending on the application. A color tuning device operates with a similar heliconical state liquid crystal material but with the heliconical director axis oriented perpendicular to the plane of the cell. A power generator varies the strength of the applied electric field to adjust the wavelength of light reflected from the cholesteric liquid crystal material within the visible, infrared or ultraviolet.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
1366492
Assignee:
KENT STATE UNIVERSITY CHO
Patent Number(s):
9,690,161
Application Number:
14/812,397
Contract Number:
FG02-06ER46331
Resource Relation:
Patent File Date: 2015 Jul 29
Research Org:
Kent State Univ., Kent, OH (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Other works cited in this record:

Nematic phase of achiral dimers spontaneously bends and twists
journal, September 2013
  • Copic, M.
  • Proceedings of the National Academy of Sciences, Vol. 110, Issue 40, p. 15855-15856
  • DOI: 10.1073/pnas.1315740110

Electrically Tunable Selective Reflection of Light from Ultraviolet to Visible and Infrared by Heliconical Cholesterics
journal, March 2015
  • Xiang, Jie; Li, Yannian; Li, Quan
  • Advanced Materials, Vol. 27, Issue 19, p. 3014-3018
  • DOI: 10.1002/adma.201500340

Chiral heliconical ground state of nanoscale pitch in a nematic liquid crystal of achiral molecular dimers
journal, September 2013
  • Chen, D.; Porada, J. H.; Hooper, J. B.
  • Proceedings of the National Academy of Sciences, Vol. 110, Issue 40, p. 15931-15936
  • DOI: 10.1073/pnas.1314654110

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