A New Optical Method to Measure Angular Tilts for Planar Anchored Nematic Liquid Crystals
作者:
I. Lelidis,
A. Gharbi,
G. Durand,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1992)
卷期:
Volume 223,
issue 1
页码: 263-276
ISSN:1058-725X
年代: 1992
DOI:10.1080/15421409208048257
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We present a new optical method to measure the small tilt angles of quasi-planar anchored nematics. We use an hybrid nematic cell which contains twin domains of different birefringence for non zero tilt. We measure the small rotation of the cell which equalize the twin domains birefringence, at a common border. This rotation is proportional to the tilt. The calibration constant can be calculated from the knowledge of the elastic constants anisotropy and the refractive indices, or independently measured from a known tilted anchoring plate. The method is linear in angle, i.e. sensitive and independent of the sample thickness. Comparative measurements of tilt on PVA and SiO are presented and discussed, using this method and other optical measurements of birefringence.
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