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A cholesteric liquid crystal device having stable uniform lying helix structure

Yip, W.C.; Welch, Chris; Mehl, Georg H.; Wilkinson, Timothy D.


W.C. Yip

Chris Welch

Timothy D. Wilkinson


A cholesteric liquid crystal device having the uniform lying helix (ULH) structure shows stable and reversible characteristics and it has been demonstrated for the analogue modulation in 10 micro-second response time at room temperature. The device comprises a polymer-free chiral nematic liquid crystal mixture and the photoalignment layer is irradiated by the UV light to cause a preferred orientation of the liquid crystal. The ULH structure is obtained by cooling the liquid crystal mixture from the isotropic phase transition temperature in the presence of electric field. On the electrical and thermal cycling, no noticeable hysteresis has been observed. In addition, the tilt angle and response time have been measured in good agreement with Meyer's theory on the flexoelectric effect in liquid crystals.

Journal Article Type Article
Publication Date Feb 1, 2020
Journal Journal of Molecular Liquids
Print ISSN 0167-7322
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 299
Article Number 112141
APA6 Citation Yip, W., Welch, C., Mehl, G. H., & Wilkinson, T. D. (2020). A cholesteric liquid crystal device having stable uniform lying helix structure. Journal of Molecular Liquids, 299,
Keywords Physical and Theoretical Chemistry; Spectroscopy; Materials Chemistry; Atomic and Molecular Physics, and Optics; Electronic, Optical and Magnetic Materials; Condensed Matter Physics