Helicoidal Structure and Spontaneous Polarization in the Mixtures of Ferroelectric Liquid Crystal with Its Racemate

Abstract
Some phenomena that critically depend on the helicoidal pitch and spontaneous polarization in ferroelectric liquid crystals are studied. These quantities are changed by mixing active DOBAMBC with its racemate. The phenomena investigated are: (1) Directions of the spontaneous polarization at the bounding surfaces, (2) Critical thickness for realizing bistability, (3) Two types of fringe patterns corresponding to the helicoidal pitch, (4) Disclination lines in the middle of a cell, (5) Unwinding of the helicoidal structure induced by an electric field, and (6) Winding of the helicoidal structure near the phase transition to Sm A.

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