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Homogeneous and heterogeneous switching in antiferroelectric liquid crystals

Published online by Cambridge University Press:  15 March 2000

R. Beccherelli ,
N. J. Mottram  and
S. J. Elston
R. Beccherelli*
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
N. J. Mottram
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
S. J. Elston
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
*
beccherelli@die.ing.uniromal.it
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Abstract

An experimental investigation of hysteretic switching in antiferroelectric liquid crystals has been carried out. It is shown that in switching from the antiferroelectric state to the ferroelectric state there exists both a heterogeneous process involving the growth of finger-like domains and a homogeneous process in which the whole cell uniformly switches. At high field slew rates the homogeneous process dominates. However, ferroelectric to antiferroelectric switching involves only a heterogeneous process. A simple analytic model is then used to describe the experimental results and thus understand the competition between homogeneous and heterogeneous switching.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 9 , Issue 3 , March 2000 , pp. 247 - 252
Copyright
© EDP Sciences, 2000

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