Dielectric Relaxation of Dye-Doped Ferroelectric Liquid Crystal Mixture: A Comparative Study of Smectic C* and Smectic A Phase

概要

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Present investigation reports dielectric relaxation behaviour of a ferroelectric liquid crystal mixture with and without doping of Anthraquinone dye. Dielectric properties of dye doped and pure ferroelectric liquid crystal mixture has been investigated as a function of temperature and frequency. In the present investigation Goldstone mode has been observed in smectic C* (SmC*) phase, while soft mode is observed in smectic A (SmA) phase and they have been explained with the help of Cole–Cole function. It has also been observed that the addition of dye strengthens the helix in SmC* phase, which is indicated by higher relaxation frequency and dielectric strength of the dye doped ferroelectric liquid crystal mixture. The SmC*–SmA phase transition point become sharper with the addition of dye in ferroelectric liquid crystal material and also shifted towards lower temperature side.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-03-15