Bend-stripes in hybrid aligned nematic layers
作者:
A. Sparavigna,
L. Komitov,
P. Palffy-Muhoray,
A. Strigazzi,
期刊:
Liquid Crystals
(Taylor Available online 1993)
卷期:
Volume 14,
issue 6
页码: 1945-1952
ISSN:0267-8292
年代: 1993
DOI:10.1080/02678299308027730
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The occurrence of bend-stripes also involving twist distortion is investigated in hybrid aligned nematic layers, with stronger tilt-anchoring at the homeotropic substrate than at the planar one. The modulated structure is found to exist above the thickness thresholddafor the aperiodic bend-splay deformation. The periodicities of the director azimuth and polar angle are incommensurate along the normal to the cell plates. In principle, two independent periodic modes are possible, the first one stable, with thresholddp=da, the second one metastable, with thresholddp>da, according to the values of the torsional extrapolation lengths. Both transitions are continuous with respect to the in-plane wavenumber. The second mode can appear only if the difference between the torsional and the tilt extrapolation lengths is positive at the planar substrate. Moreover, both thresholds are independent of the saddle-splay elastic constant.
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