Zenithal bistable device: comparison of modeling and experiment

SPENCER, T. J., CARE, C. M., AMOS, R. M. and JONES, J. C. (2010). Zenithal bistable device: comparison of modeling and experiment. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 82 (2).


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Link to published version:: 10.1103/PhysRevE.82.021702


A comparative modeling and experimental study of the zenithal bistable liquid crystal device is presented. A dynamic Landau de Gennes theory of nematic liquid crystals is solved numerically to model the electric field induced latching of the device and the results are compared with experimental measurements and theoretical approximations. The study gives a clear insight into the latching mechanism dynamics and enables the dependence of the device latching on both material parameters and surface shape to be determined. Analytical approximation highlights a route to optimize material selection in terms of latching voltages and the numerical model, which includes an accurate surface representation, recovers the complex surface shape effects. Predictions of device performance are presented as a function of both surface anchoring strength and surface shape and grating pitch. A measurement of the homeotropic anchoring energy has been undertaken by comparing the voltage response as a function of cell gap; we find the homeotropic anchoring energies can be varied in the range 0.5 to 4 (10-44 J m-2).

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Materials and Fluid Flow Modelling Group
Identification Number: 10.1103/PhysRevE.82.021702
Depositing User: Ann Betterton
Date Deposited: 29 Sep 2010 11:03
Last Modified: 20 Aug 2015 22:43
URI: http://shura.shu.ac.uk/id/eprint/2523

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