Circular dichroism in ferroelectric and antiferroelectric liquid crystals

Ji Li Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan; Hoechst Japan Ltd., Advanced Technology Lab., Minamidai 1-3-2, Kawagoe, 350, Japan

Hideo Takezoe Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Atsuo Fukuda Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Junji Watanabe Department of Polymer Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152, Japan

Abstract

Liquid crystal induced circular dichroism (LCICD) measurements were made to investigate the pretransitional phenomena in the S_A phase just above the S_A-S∗_C and S_A-S∗_CA phase transitions of both the first and the second order. The pretransitional LCICD in S_A was observed in the second order phase transition to S∗_c and S∗_cA, suggesting the existence of a dynamic helical structure in S_A. Such behaviour disappears when the transition is of the first order. It seems that the handedness of the dynamic helix in S_A is the same as that in S∗_c even when the lower temperature phase is S∗_cA. This is explained as a result of a dominant contribution of ferroelectric soft mode.

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Circular dichroism in ferroelectric and antiferroelectric liquid crystals

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