弯曲芯型向列相液晶中的挠曲电畴

弯曲芯型向列相（BCN）液晶在一定的低频电压和温度下会产生挠曲电畴，出现明暗相间的周期结构。本文使用偏光显微镜（BX-51）和电荷耦合元件（CCD）探测了BCN中挠曲电畴的周期大小变化与电压及温度的关系，并使用光学衍射技术对该周期结构进行了验证。实验结果表明：温度达到95℃，并且外加电压达到25 V时，BCN液晶的挠曲电畴条纹结构首次出现。在温度一定的条件下，畴的周期随外加电压的增大而逐渐减小；而电压一定的条件下，周期结构的对比度随温度的升高逐渐变得模糊，必须增大外加电压才能使模糊的周期结构重新变得清晰。本研究对探索BCN液晶在液晶光栅领域的应用与发展具有一定的指导意义。

Flexodomain in BCN liquid crystal

Bent-core nematic (BCN) liquid crystal under a certain low frequency voltage and temperature will produce flexodomain, a spatially periodic array of bright and dark stripes. Through polarizing microscope (BX-51) and charge coupled device (CCD), the change of periodic flexodomain under different applied voltages and temperatures were explored. The periodic structure was verified by using the optical diffraction technology, too. The results show that flexodomain first appears when the applied voltage is 25 V and the temperature is 95℃, and the period of flexodomain decreases with the increase of applied voltage as the temperature is a certain value. In addition, when the voltage is a certain value, the contrast of periodic structure will become blurry with the increase of temperature and the blurry stripes become clear again only when the applied voltage increased. This research has a certain guiding significance on the application and development of BCN liquid crystal in liquid crystal grating.