Generation, propagation, and switching of orientational waves in photoexcited liquid-crystalline monolayers.
Generation, propagation, and switching of orientational waves in photoexcited liquid-crystalline monolayers.
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光激发液晶单层中定向波的产生、传播和切换。
DOI：
10.1103/physreve.69.050701
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
H. Yokoyama
中科院分区：
文献类型：
--
作者：
T. Okuzono;Y. Tabe;H. Yokoyama
光致取向波是软凝聚态体系中最显著的远离平衡态的现象之一。我们从唯象的角度来模拟这种行为，考虑到分子的各向异性光激发。数值模拟以及理论分析的模型表明，复杂的相互作用之间的自发张开变形的液晶顺序和各向异性的光激发可以导致的取向波的产生和传播。该模型可以解释这一现象的所有显著特征，特别是近十年来一直无法从理论上解释的光偏振方向旋转90度后传播方向的反常反转现象。
Photoinduced orientational waves in illuminated liquid-crystalline monolayers is one of the most remarkable far-from-equilibrium phenomena that systems of soft condensed matter exhibit. We model this behavior from a phenomenological point of view, taking the anisotropic photoexcitation of molecules into account. Numerical simulations as well as theoretical analyses of the model reveal that the intricate interplay between the spontaneous splay deformation of the liquid-crystalline order and the anisotropy of the photoexcitation can lead to the generation and propagation of orientational waves. The model can explain all the salient features of the phenomenon-in particular, the anomalous reversal of the propagation direction upon 90 degrees rotation of the polarization direction of illumination, which evaded theoretical explanation for nearly a decade.