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Write and erase mechanism of surface controlled bistable nematic pixel

Published online by Cambridge University Press:  15 March 1999

M. Giocondo ,
I. Lelidis ,
I. Dozov  and
G. Durand
M. Giocondo*
Affiliation:
Istituto Nazionale di Fisica della Materia, Unità di Cosenza, c/o Dipartimento di Fisica Università della Calabria, 87036 Cosenza, Italy
I. Lelidis
Affiliation:
École Polytechnique Fédérale de Lausanne, Departement de Physique, Institut de Génie Atomique, 1015 Lausanne, Switzerland
I. Dozov
Affiliation:
Laboratoire de Physique des Solides, Université de Paris-Sud, Centre d'Orsay, bâtiment 510, 91405 Orsay Cedex, France
G. Durand
Affiliation:
Laboratoire de Physique des Solides, Université de Paris-Sud, Centre d'Orsay, bâtiment 510, 91405 Orsay Cedex, France
*
[email protected]
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Abstract

Recently a new nematic bistable pixel, using simple monostable planar anchorings, has beenproposed [4−6]. This pixel can be switched between two textures, having the same boundary conditionsbut different optical properties: one texture (U) is undistorted, whereas the other one (T) ischaracterized by the presence of a half-turn twist. The U → T switching was obtained by abruptlydropping the driving electric field. A slow decrease of the driving electric field favors the T → Utransition. The electric field fall rate discriminates the kind of coupling between the boundary surfaces,hydrodynamic or elastic. Here we show the same behavior of this system by using square electric fieldpulses. We present experimental results concerning the critical values (amplitude and duration) of thedriving signals, for which the elastic and the hydrodynamic effects are balanced and we measure theiroptimized values. Our results are in reasonable agreement with the theoretical predictions obtained by asimplified model.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 5 , Issue 3 , March 1999 , pp. 227 - 230
Copyright
© EDP Sciences, 1999

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