Effects of monoclinic symmetry on the properties of biaxial liquid crystals.

Effects of monoclinic symmetry on the properties of biaxial liquid crystals.
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单斜对称性对双轴液晶性能的影响。

DOI:
10.1103/physreve.97.042702
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发表时间:
2018
期刊:
Physical review. E
影响因子:
--
通讯作者:
Solodkov NV
Solodkov NV
中科院分区:
--
文献类型:
--
作者:
Solodkov NV

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倾斜的近晶液晶相,如在灾难性液晶中看到的近晶- c相,通常使用双轴正交对称的假设来处理。然而,微晶c相具有单斜对称,从而允许基于对称和不变性原理的主光学轴和介电轴分离。这里通过比较两种材料的光学和介电测量来证明这一点,这些材料具有从向列相到微晶c相的高度一阶直接转变。结果表明,主轴组的取向差异很大,这可以解释为光频率和介电频率存在两个不同的锥角。两种材料均表现出随温度降低而增加的单斜行为。由于开关速度快,铁电型微晶c *材料对于快速调制器和LCoS器件非常重要,其中介电双轴性会影响器件的工作。
Tilted smectic liquid crystal phases such as the smectic-C phase seen in calamitic liquid crystals are usually treated using the assumption of biaxial orthorhombic symmetry. However, the smectic-C phase has monoclinic symmetry, thereby allowing disassociation of the principal optic and dielectric axes based on symmetry and invariance principles. This is demonstrated here by comparing optical and dielectric measurements for two materials with highly first-order direct transitions from nematic to smectic-C phases. The results show a high difference between the orientations of the principal axes sets, which is interpreted as the existence of two distinct cone angles for optical and dielectric frequencies. Both materials exhibit an increasing degree of monoclinic behavior with decreasing temperature. Due to fast switching speeds, ferroelectric smectic-C* materials are important for fast modulators and LCoS devices, where the dielectric biaxiality influences device operation.
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