Electric-Field-Induced Director-Field Transition of Nematic Liquid Crystal in a Closed Conical Cavity

概要

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Continuum theory and numerical method are utilized in this study to report the dependence of director-field transition induced by electric field on the elastic constants of nematic liquid crystal (NLC) with negative dielectric anisotropy in a closed conical cavity with perpendicular boundary conditions of NLC. Normal umbilic structure(NU), twisted umbilic structure (TU), normal hyperbolic point structure with a disclination ring (NH), twisted hyperbolic point structure with a disclination ring (TH), and normal Poincare structure (NP) are found to be stablestructures in electric-field-induced transitions. Moreover, five typical sequences of transition, TN_<NU→TU→TH>, T_<NU→TU→NH→TH>, T_<NU→TU→NH>, T_<NU→NH>, and T_<NU→NP→NH> are found in the range of applned voltage less than 10 V. The transition sequences and the transition voltages are strongly dependent on the ratios of elastic constants K_11/K_33 and K_22/K_33
社団法人応用物理学会の論文
1994-11-15