3D16 液晶フォトニクス材料 : アゾベンゼン液晶の光相転移挙動とガラス転移の効果を利用した光記録

概要

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We have studied photonic control of light by means of photochemical reaction of liquid-crystalline azobenzene derivatives. In this study, we used polymer azobenzene liquid crystals(LCs) which showed nematic phase in trans form while no liquid-crystalline phase in cis form. Photoirradiation of the polymer azobenzene LCs to bring about trans-cis isomerization (〜360 nm) resulted in disappearance of the nematic phase. The nematic phase was restored when the irradiated sample was kept at temperatures above Tg in the dark because of cis-trans thermal back isomerization followed by reorientation of the trans-azobenzenes. However, when the irradiated sample was kept at temperatures below Tg, the nematic phase did not recover even though the trans form was restored thermally. These results indicate that Tg is a crucial factor to determine the stability of the optical image stored in polymer azobenzene LCs.
日本液晶学会の論文
1995-09-10