Deformation of the Helical Structure during the Unwinding and Winding Process of Ferroelectric Liquid Crystals

概要

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The effect of magnetic field on the molecular alignment of ferroelectric liquid crystals is observed on the cooling process from an isotropic phase to a chiral smectic C phase. In a sample having phase sequences I-N^*-S_A-S^*_C, the monodomain is formed under the magnetic field. The texture change relating to the deformation of the helical structure is investigated in the monodomain. When a d.c. voltage is applied in the S^*_C phase, the focal conics appear at a low voltage range below the threshold for unwinding of the helix. While the voltage is decreased after the unwinding, the helical structure begins to form from the focal conics. The electrooptic effect induced by the deformation of the helical structure depends on the molecular alignment in the S^*_C phase.
社団法人応用物理学会の論文
1990-02-20