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Proceedings Paper

Collective and molecular processes in ferroelectric liquid crystals and their application aspects
Author(s): Wolfgang Haase; S. Wrobel; Matthias Pfeiffer
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Paper Abstract

In tilted smectic phases C Sm C, Sm 1, Sm F and Sm / ) consisting of polar non-centrosymmetric molecules, a pronounced contribution to the dielectric permittivity is observed, which can be assigned to the Goldstone mode. It is a collective process showing a non-Arrhenius type behaviour in the temperature dependence of the relaxation time . By applying a bias electrical field, which is strong enough to unwind the helix, the Goldstone mode contribution can be suppressed . In all smectic phases there are high frequency relaxations arising from the principal molecular motions, i. e. from the reorientations about the long and short molecular axes. In the vicinity of the Sm A* Sm C* phase transition the so-called soft mode appears obeying Curie-Weiss behavior of the dielectric increment. Application aspects of different chiral smectics will be discussed in view of the different relaxation mechanisms by taking the recent experimental studies into account.

Paper Details

Date Published: 1 April 1990
PDF: 11 pages
Proc. SPIE 1257, Liquid Crystal Displays and Applications, (1 April 1990); doi: 10.1117/12.19940
Show Author Affiliations
Wolfgang Haase, Technische Hochschule Darmstadt (Germany)
S. Wrobel, Jagellonian Univ. (Poland)
Matthias Pfeiffer, Technische Hochschule Darmstadt (Germany)

Published in SPIE Proceedings Vol. 1257:
Liquid Crystal Displays and Applications
J. William Doane; Zvi Yaniv, Editor(s)

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