In situ measurements of twist and bend elastic constants in the oblique helicoidal cholesteric
In situ measurements of twist and bend elastic constants in the oblique helicoidal cholesteric
复制标题
斜螺旋胆甾型扭转和弯曲弹性常数的原位测量
DOI：
10.1103/physreve.106.024702
复制
发表时间：
2022
影响因子：
2.4
通讯作者：
Lavrentovich, Oleg D.
中科院分区：
文献类型：
--
作者：
Iadlovska, Olena S.;Thapa, Kamal;Rajabi, Mojtaba;Shiyanovskii, Sergij V.;Lavrentovich, Oleg D.
斜螺旋胆甾醇（）独特的电光特性源于其螺旋导向器结构。施加的电场保留指向矢的单谐波调制，同时在宽光谱范围内调整周期和相应的布拉格峰值波长。我们利用对电场的响应来直接测量胆甾相中扭转和弯曲的弹性常数。和 的温度依赖性使我们能够确定螺距和螺旋角的电可调范围。这些数据对于理解分子组成和手性如何影响手性液晶的宏观弹性特性以及基于此的光学器件的开发非常重要。
Unique electro-optical properties of the oblique helicoidal cholesteric () stem from its heliconical director structure. An applied electric field preserves the single-harmonic modulation of the director while tuning theperiod and the corresponding Bragg-peak wavelength within a broad spectral range. We use the response ofto the electric field to measure the elastic constants of twistand benddirectly in the cholesteric phase. The temperature dependencies ofandallow us to determine the range of the electric tunability of thepitch and the heliconical angle. The data are important for understanding how molecular composition and chirality influence macroscopic elastic properties of the chiral liquid crystals and for the development of-based optical devices.