Collective and molecular processes in ferroelectric liquid crystals and their application aspects

Wolfgang Haase; S. Wrobel; Matthias Pfeiffer

doi:10.1117/12.19940

1 April 1990 Collective and molecular processes in ferroelectric liquid crystals and their application aspects

Wolfgang Haase, S. Wrobel, Matthias Pfeiffer

Proceedings Volume 1257, Liquid Crystal Displays and Applications; (1990) https://doi.org/10.1117/12.19940
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States

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.

Citation Download Citation

Wolfgang Haase, S. Wrobel, and Matthias Pfeiffer "Collective and molecular processes in ferroelectric liquid crystals and their application aspects", Proc. SPIE 1257, Liquid Crystal Displays and Applications, (1 April 1990); https://doi.org/10.1117/12.19940

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