论文标题
在斜螺旋胆固醇中的扭曲和弯曲弹性常数的原位测量
In-situ measurements of twist and bend elastic constants in oblique helicoidal cholesteric
论文作者
论文摘要
倾斜螺旋胆固醇（CHOH）的独特电光特性源于其旋转主管的结构。应用电场保留了导演的单个谐波调制，同时调整CHOH时期和相应的Bragg峰波长在宽光谱范围内。我们使用CHOH对电场的响应直接在胆固醇相中测量Twist K22和Bend K33的弹性常数。 K22和K33的温度依赖性使我们能够确定CHOH螺距和旋转角度的电可调性范围。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CHOH的光学设备的开发很重要。
Unique electro-optical properties of the oblique helicoidal cholesteric (ChOH) stem from its heliconical director structure. An applied electric field preserves the single harmonic modulation of the director while tuning the ChOH period and the corresponding Bragg peak wavelength within a broad spectral range. We use the response of ChOH to the electric field to measure the elastic constants of twist K22 and bend K33 directly in the cholesteric phase. The temperature dependencies of K22 and K33 allow us to determine the range of the electric tunability of the ChOH pitch 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 ChOH-based optical devices.
