Collective Molecular Motion during V-Shaped Switching in a Smectic Liquid Crystal
Collective Molecular Motion during V-Shaped Switching in a Smectic Liquid Crystal
复制标题
近晶液晶 V 形开关过程中的集体分子运动
DOI：
10.1143/jjap.38.1474
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发表时间：
1999
影响因子：
1.5
通讯作者：
H. Takezoe
中科院分区：
文献类型：
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作者：
Byoungchoo Park;S. Seomun;M. Nakata;Masayoshi Takahashi;Y. Takanishi;K. Ishikawa;H. Takezoe
通过测量有效光学各向异性 Δneff、表观倾斜角 θapp、切换电流和二次谐波产生，并将它们与基于两种极端模型（即分子随机切换和集体切换的随机模型和集体模型）的模拟结果进行比较，研究了均匀排列近晶 C* 类液晶 (LC) 单元中 V 形切换过程中的分子运动。比较表明，液晶分子的集体开关运动比随机运动更合理。此外，还证实了由于液晶分子分布而观察到的苯基伸缩模式的红外吸收各向异性强烈支持集体模型。这些结果表明，液晶分子不是随机切换的，而是所有液晶分子在驱动场下在锥体上集体旋转。
The molecular motion during V-shaped switching in a homogeneously aligned smectic C*-like liquid crystal (LC) cell has been investigated by measuring the effective optical anisotropy Δneff, apparent tilt angle θapp, switching current, and second-harmonic generation and comparing them with the simulated results based on two extreme models, i.e., random model and collective model, where molecules switch randomly and collectively, respectively. The comparison revealed that the collective switching motion of LC molecules is more reasonable than the random motion. Moreover, it was also confirmed that the observed infrared absorption anisotropy of the phenyl stretching mode due to LC molecular distributions strongly supports the collective model. From these results, it was demonstrated that LC molecules do not switch randomly but all the LC molecules rotate collectively on a cone under the driving field.
Y. Ouchi、H. Takezoe 和 A. Fukuda：铁电体。
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