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Molecular Crystals and Liquid Crystals Volume 454, 2006 - Issue 1
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Original Articles

Hypothesis of Dye Aggregation in a Nematic Liquid Crystal: From Experiment to a Model of the Enhanced Light-Director Interaction

V. M. Pergamenshchik Institute of Physics, Kyiv, UkraineCorrespondence[email protected]
,
V. Ya. Gayvoronsky Institute of Physics, Kyiv, Ukraine
,
S. V. Yakunin Institute of Physics, Kyiv, Ukraine
,
R. M. Vasyuta Institute of Physics, Kyiv, Ukraine
,
V. G. Nazarenko Institute of Physics, Kyiv, Ukraine
&
O. D. Lavrentovich Liquid Crystal Institute, Kent State University, Kent, Ohio
Pages 145/[547]-156/[558] | Published online: 22 Sep 2006
 
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Abstract

We report experimental and theoretical arguments showing that the effect of strong enhancement of the light-induced director reorientation in a nematic liquid crystal doped with anthraquinone dye molecules (Jánossy effect) can be related to their aggregation. The torque on the director is due to dependence of the entropy of the aggregate subsystem on the electric field vector relative to the director.

Acknowledgments

We are greatful to O. D. Kachkovskiy, Yu. L. Slominski, A. B. Nych, B. I. Lev, Yu. P. Boiko, Yu. P. Piryatinskiy, Yu. A. Nastyshyn, P. M. Tomchuk, P. J. Collings, S. V. Shiyanovskii, and A. S. Zolot'ko for discussions. The work was supported by NAS of Ukraine via Grant #1.4.1B/109 and CRDF award #UK-P1-2617-KV-04.

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