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Title: Effect of director pretilt on field induced periodic distortions in nematics
Authors: Kini, U.D.
Keywords: Electric and magnetic field effects on liquid crystals
orientational transitions in liquid cyrstals
curvature elasticity of liquid crystals
boundary value and eigenvalue problems
numerical simulation
solution of differential equations
stability and perturbation methods
Issue Date: 1997
Publisher: Gorden and Breach Science Publishers.
Citation: Molecular Crystals and Liquid Crystals, 1997, Vol.308, p43-76
Abstract: This work reports a theoretical study on the linear threshold of static director distortions In a rigidly anchored nematic sample subjected to the simultaneous actions of electric (E) and magnetic (B) fields applied along certain symmetry directions with respect to the initial uniform director alignment no. The results mainly concern a material having susceptibility anisotropies of opposite signs (c, > 0, l, < 0). The deformation above the electric threshold may be homogeneous (HD) or periodic (PD) depending upon material and geometric parameters. PD is quenched when no is tilted sufficiently away from the homeotropic or when B is impressed away from E. For a given director pretilt, the direction of post threshold periodicity changes continuously with the magnetic tilt. At a given magnetic tilt, the PD threshold parameters exhibit a discontinuous change when the director pretilt is varied. Phase diagrams in different planes of the parameter space demarcate the regions of existence of PD and HD. The importance of elastic anisotropy in determining the nature of PD emerges from a study of a hypothetical material having two equal curvature elastic constants.
Description: Restricted Access
ISSN: 1058-725X
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Copyright: 1997 OPA (Overseas Publishers Association) N.V.
Appears in Collections:Research Papers (SCM)

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