Electrogyration effect in a chiral bent-core molecular system

Abstract

The linear electrogyration effect is observed in the crystallike ${\mathrm{B}}_4$ phase of a mixture of chiral and achiral bent-core mesogens. A large birefringent monodomain with a single sense of chirality was selected for experiment. Upon application of a modulating electric field to the sample cell, a strong modulation of refractive index was observed. Analysis showed that both the linear electro-optic and the linear electrogyration effect are responsible for the index modulation with the latter being dominant. The effective electro-optic coefficient was measured to be $r_{\mathrm{eff}}=21.6 \mathrm{pm}/\mathrm{V}$ at 488 nm.

© 2003 Optical Society of America

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