The effect of varying the dielectric anisotropy, Δε on the electro-optic behaviour of an achiral SC layer has been studied using the frequency dependent dielectric anisotropy of a pyrimidine mixture. A field dependence of the optical extinction angle was observed at frequencies corresponding to Δε >0, Δε = 0 and Δε<0. Switching at frequencies for which Δε = 0 is interpreted using a biaxial dielectric tensor. It is proposed that dielectric biaxiality causes the AC field effects observed in ferroelectric liquid crystal devices with the surface stabilized geometry.
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Jones et al. (1990) studied this question.
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