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Advances in Condensed Matter Physics
Volume 2013, Article ID 363157, 13 pages
Research Article

Modeling Reorientation Dynamics of Electrically Assisted Light-Induced Gliding of Nematic Liquid-Crystal Easy Axis

1Moscow State University of Instrument Engineering and Computer Science, Stromynka 20, Moscow 107846, Russia
2Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
3Chernigov State Technological University, Shevchenko Street 95, Chernigov 14027, Ukraine
4Institute of Physics of National Academy of Sciences of Ukraine, Prospekt Nauki 46, Kiev 03028, Ukraine

Received 18 May 2013; Revised 12 August 2013; Accepted 14 August 2013

Academic Editor: Kim Chow

Copyright © 2013 S. V. Pasechnik et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The phenomenological torque balance model previously introduced to describe the electrically assisted light-induced gliding is generalized to study the reorientation dynamics of the nematic liquid crystal easy axis at photoaligned azo-dye films under the combined action of in-plane electric field and reorienting UV light linearly polarized at varying polarization azimuth, . We systematically examine the general properties of the torque balance model by performing analysising the bifurcations of equilibria at different values of the polarization azimuth and apply for the model to interpret the experimental results. These involve observation of the pronounced purely photoinduced reorientation at , as opposed to the case where the light polarization vector is parallel to the initial easy axis (), and the reorientation is almost entirely suppressed. In the regions between electrodes with nonzero electric field, the effects described by the model are that (a) the dynamics of reorientation slows down with and (b) the sense of easy axis rotation is independent of the sign of .