Layr Rotation Dynamics and Its Functional Application in Ferroelectric and Antiferroelectric Liquid Crystal Devices

层旋转动力学及其在铁电和反铁电液晶器件中的功能应用

基本信息

批准号：
09450143
负责人：
OZAKI Masanori
金额：
$ 8.13万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450143/
关键词：
ferroelectric liquid crystal antiferroelectric liquid crystal smectic layr chiral smectic C phase カイラルネマチック相光記録

项目摘要

The smectic layer rotation in ferroelectric and antiferroelectric liquid crystals has been studied using a variety of materials, cell configurations and waveforms of driving voltage. The smectic layer uniformly rotates upon the application of ac electric field having an asymmetric component of the waveform. In the system including electrical impurity, the layer rotates even by applying dc voltage, which is associated with the electrohydrodynamic effect. From the total reflection ellipsometry measurement, it has been found that the layers in the vicinity of the cell surfaces rotate in the same manner as that in bulk.The characteristic domain formation has been observed in a smectic liquid crystal having direct phase transition from the nematic to the smectic C phases, which has long rectangular domains parallel to the rubbing axis. Using this material, periodical domain structure has been fabricated. Reversible optical recording by the irradiation of laser light has also been realized using ferroelectric liquid crystal with N^*-SmC^* phase sequence.Photo-induced layer switching has been realized in the system of azo-dye doped ferroelectric liquid crystal having N^*-SmC^* phase sequence. Upon the irradiation of the UV light, photoisomerization of azo-dye in the liquid crystal takes place and the phase changes into the N^* phase, and upon the sequential irradiation of the green light, the phase of the liquid crystal go back to the SmC^* phase. Upon the simultaneous application of the electric field during this sequential irradiation of the light, the direction of the layer alignment is switched to the opposite direction.

使用各种材料、单元配置和驱动电压波形研究了铁电和反铁电液晶中的近晶层旋转。近晶层在施加具有不对称波形分量的交流电场时均匀地旋转。在包含电杂质的系统中，即使通过施加直流电压，该层也会旋转，这与电流体动力学效应相关。通过全反射椭圆光度测量，发现单元表面附近的层以与本体相同的方式旋转。在具有从向列相直接相变的近晶液晶中观察到特征域的形成近晶 C 相，具有平行于摩擦轴的长矩形区域。使用这种材料，已经制造出了周期域结构。利用N^*-SmC^*相序的铁电液晶也实现了激光照射下的可逆光记录。在N^*-SmC^*相序的铁电液晶系统中实现了光致层切换。 *-SmC^* 相序。在紫外光的照射下，液晶中的偶氮染料发生光异构化，相变为N^*相，在绿光的连续照射下，液晶的相又回到了N^*相。 SmC^*相。当在光的顺序照射期间同时施加电场时，层取向的方向切换至相反方向。