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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 liquidcrystals has been carried out. It is shown that in switching from the antiferroelectricstate to the ferroelectric state there exists both a heterogeneous process involving thegrowth of finger-like domains and a homogeneous process in which the whole cell uniformlyswitches. At high field slew rates the homogeneous process dominates. However, ferroelectricto antiferroelectric switching involves only a heterogeneous process. A simple analytic modelis then used to describe the experimental results and thus understand the competition betweenhomogeneous and heterogeneous switching.

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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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