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Proceedings Paper

Switching behavior of antiferroelectric liquid-crystalline mixtures
Author(s): F. Goc; Wojciech Kuczynski; Roman S. Dabrowski; Barbara Stryla; H. Gierszal
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Paper Abstract

Results of investigations of the switching phenomenon in antiferroelectric liquid crystals are presented. Mixtures possessing the smectic C*A phase in very broad temperature range, including the room temperature, were investigated. The influence of several experimental conditions on switching phenomenon was studied. The switching process was detected using two independent methods. In the electrooptic method, the intensity of light passing the sample placed between crossed polarizers was registered. In the second method the current flowing across the cell during the change of the polarization direction was measured. Both methods have given consistent results. The critical electric field strength needed for changing the polarization direction by 180 degrees has been determined as function of temperature, pulse shape and frequency. Two kinds of switching were observed. At low frequency of triangle-shaped of temperature, pulse shape and frequency. Two kinds of switching were observed. At low frequency of triangle-shaped voltage the switching between three stable states took place. At higher frequencies, or when the voltage has rectangular shape, we observed the switching between two ferroelectric states. A simple and accurate method of measurement of the threshold field for bistable switching is proposed.

Paper Details

Date Published: 14 December 1999
PDF: 5 pages
Proc. SPIE 4017, Polymers and Liquid Crystals, (14 December 1999); doi: 10.1117/12.373704
Show Author Affiliations
F. Goc, Institute of Molecular Physics (Poland)
Wojciech Kuczynski, Institute of Molecular Physics (Poland)
Roman S. Dabrowski, Military Academy of Technology (Poland)
Barbara Stryla, Institute of Molecular Physics (Poland)
H. Gierszal, Institute of Molecular Physics (Poland)


Published in SPIE Proceedings Vol. 4017:
Polymers and Liquid Crystals
Andrzej Wlochowicz, Editor(s)

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