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The field-induced cholesteric-nematic phase transition and its dependence on layer thickness, boundary conditions, and temperature

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3 Author(s)
Schlangen, Luc J.M. ; Philips Research Laboratories, Prof. Holstlaan 4, Eindhoven 5656AA, The Netherlands ; Pashai, Alexandre ; Cornelissen, Hugo J.

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Chiral-nematic liquid-crystal layers which have a short pitch, homeotropic boundary conditions, and bistable properties are investigated with respect to the temperature dependence of their field-induced cholesteric-nematic phase transition. Hereto the threshold field needed for the transition is studied as a function of the layer thickness. This is done for various temperatures. The threshold field hardly depends on the layer thickness. Moreover, it sharply rises below -5 °C. Both the value of the threshold field and its temperature dependence can be fully described in terms of liquid-crystal bulk material parameters, the conditions at the homeotropic boundary layer used do not play a role. From the threshold field data the twist elastic constant is determined as a function of temperature. This temperature dependence is compared to the temperature dependence as determined from the square of the long range order parameter calculated from temperature dependent refractive index data. A good correlation is found between both data sets of the twist elastic constant. © 2000 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:87 ,  Issue: 8 )

Date of Publication:

Apr 2000

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