Local Orientation Transitions to a Lying Helix State in Negative Dielectric Anisotropy Cholesteric Liquid Crystal

被引:0
|
作者
Simdyankin, Ivan V. [1 ]
Geivandov, Artur R. [1 ]
Kasyanova, Irina V. [1 ]
Palto, Serguei P. [1 ]
机构
[1] Shubnikov Inst Crystallog, Natl Res Ctr Kurchatovsky Inst, Kurchatovsky Complex Crystallog & Photon, Leninskii Pr 59, Moscow 119333, Russia
关键词
cholesteric liquid crystal; lying helix; negative dielectric anisotropy; numerical simulation; ALIGNMENT; LAYERS;
D O I
10.3390/cryst14100891
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
Orientation transitions in a cholesteric liquid crystal (CLC) layer with negative dielectric anisotropy, under the influence of a non-uniform spatially periodic electric field created using a planar system of interdigitated electrodes, were studied experimentally and numerically. In the interelectrode space, transitions are observed from a planar Grandjean texture, with the helix axis perpendicular to the layer plane, to states with a lying helix, when the helix axis is parallel to the layer plane and perpendicular to the electrode stripes. It was found that the relaxation time of the induced state in the Grandjean zones, corresponding to two or more half-turns of the helix, significantly exceeded the relaxation time for the first Grandjean zone with one half-turn. An analysis of experimentally observed and numerically simulated textures shows that slow relaxation to the initial state in the second Grandjean zone, as well as in higher-order zones, is associated with the formation of local topologically equivalent states. In these states, the helix has a reduced integer number of helix half-turns throughout the layer thickness or unwound into the planar alignment state.
引用
收藏
页数:15
相关论文
共 50 条
  • [1] Electric-Field Induced Transitions in a Cholesteric Liquid-Crystal Film with Negative Dielectric Anisotropy
    Gartland, E. C., Jr.
    Huang, H.
    Lavrentovich, O. D.
    Palffy-Muhoray, P.
    Smalyukh, I. I.
    Kosa, T.
    Taheri, B.
    JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE, 2010, 7 (04) : 709 - 725
  • [2] Electrically controllable laser based on cholesteric liquid crystal with negative dielectric anisotropy
    Lin, TH
    Jau, HC
    Chen, CH
    Chen, YJ
    Wei, TH
    Chen, CW
    Fuh, AYG
    APPLIED PHYSICS LETTERS, 2006, 88 (06)
  • [3] Flexoelectric and dielectric effects in uniform lying helix cholesteric liquid crystals
    Gao, Mengchen
    Zhang, Hongwen
    Wang, Yakun
    Li, Jianfei
    Zhang, Yanjun
    MOLECULAR PHYSICS, 2021, 119 (05)
  • [4] A cholesteric liquid crystal device having stable uniform lying helix structure
    Yip, W. C.
    Welch, Chris
    Mehl, Georg H.
    Wilkinson, Timothy D.
    JOURNAL OF MOLECULAR LIQUIDS, 2020, 299 (299)
  • [5] Electrical orientation behaviour of a nematic liquid crystal with negative dielectric anisotropy above the microelectrodes
    Tanaka, Katsufumi
    Tanabe, Yuichiro
    Iwamitsu, Yuka
    Uchimura, Masayoshi
    Kobayashi, Haruki
    Akiyama, Ryuichi
    LIQUID CRYSTALS, 2014, 41 (10) : 1419 - 1429
  • [6] ELECTROHYDRODYNAMIC INSTABILITIES IN CHOLESTERIC LIQUID-CRYSTALS WITH NEGATIVE DIELECTRIC ANISOTROPY
    ARNOULDN.H
    RONDELEZ, F
    MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1974, 26 (1-2): : 11 - 31
  • [7] Formation of a defect-free uniform lying helix in a thick cholesteric liquid crystal cell
    Inoue, Yo
    Moritake, Hiroshi
    APPLIED PHYSICS EXPRESS, 2015, 8 (07)
  • [8] Electro-Thermal Formation of Uniform Lying Helix Alignment in a Cholesteric Liquid Crystal Cell
    Yu, Chia-Hua
    Wu, Po-Chang
    Lee, Wei
    CRYSTALS, 2019, 9 (04):
  • [9] ELECTRIC-FIELD-INDUCED PHASE-TRANSITIONS IN FRUSTRATED CHOLESTERIC LIQUID-CRYSTALS OF NEGATIVE DIELECTRIC ANISOTROPY
    RIBIERE, P
    PIRKL, S
    OSWALD, P
    PHYSICAL REVIEW A, 1991, 44 (12): : 8198 - 8209
  • [10] DISTORTION OF CHOLESTERIC PLANAR TEXTURE IN LIQUID-CRYSTALS WITH A NEGATIVE DIELECTRIC ANISOTROPY
    DEZWART, M
    JOURNAL DE PHYSIQUE, 1978, 39 (04): : 423 - 431