Abstract
The Fréedericksz transition can become subcritical in the presence of a feedback mechanism that leads to the dependence of the applied electric field onto the liquid crystal re-orientation angle. We have given evidence of a first-order Freedericksz transition in a Liquid Crystal Light Valve with optical feedback. We have characterized this transition both experimentally and theoretically, with the determination of the bistability region as well as of the transition and the Maxwell points. In one and two spatial dimension, we have investigated the propagation of the fronts connecting the stationary states. In particular, in one spatial dimension we have measured the velocity of front propagation. Theoretically we have used a minimal description, subcritical Landau equation, valid close to the Fréedericksz transition. This description is in a good agreement with the experimental observations.
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Clerc, M.G., Petrossian, A., Residori, S., Riera, C.S. (2004). Front Dynamics in a Liquid Crystal Light Valve with Feedback. In: Descalzi, O., Martínez, J., Rica, S. (eds) Instabilities and Nonequilibrium Structures IX. Nonlinear Phenomena and Complex Systems, vol 9. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0991-1_7
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DOI: https://doi.org/10.1007/978-94-007-0991-1_7
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