Optical guided-wave study of a homeotropically aligned ferroelectric liquid crystal
作者:
Gong Mengnan,
J.R. Sambles,
Fuzi Yang,
期刊:
Liquid Crystals
(Taylor Available online 1993)
卷期:
Volume 13,
issue 5
页码: 637-644
ISSN:0267-8292
年代: 1993
DOI:10.1080/02678299308026337
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The excitation of optical modes is used to study the optical tensor configuration in a thin ferroelectric liquid crystal layer, cooled from the initially homeotropically aligned nematic phase. By monitoring the angular dependent reflectivity for plane polarized radiation coupled into the guided modes in the smectic C* layer and subsequently fitting the recorded data to predictions from multilayer optics theory, the optical tensor configuration in the layer is fully evaluated. Iteratively modelling the full tilt/twist profile in the cell, progressively converging the predicted reflectivity to experimental data, gives a complete and very well specified picture of the optical tensor throughout the cell. By studying the cell at various temperatures, the temperature dependence of the tilt of the major axis of the optic tensor (which may be related to the cone angle if the smectic layers are parallel to the cell surface) has been established. The temperature dependent optical dielectric constants have also been obtained.
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