胆甾相与蓝相液晶的布拉格反射和旋光能力研究

Bragg reflection and optical rotatory power of cholesteric and blue phase liquid crystal

采用时域有限差分法(FDTD)研究了胆甾相液晶与蓝相液晶的旋光能力。首先计算了圆偏振光在平面态胆甾相液晶与蓝相液晶中的布拉格反射现象,从晶格结构和分子排列的角度对模拟结果做了讨论,研究了液晶折射率和螺距对布拉格反射现象的影响。其次研究了胆甾相与蓝相液晶夹在两正交偏振片间的漏光情况,用液晶的旋光能力对二者的相似和不同的现象进行了解释。

The Bragg reflection and optical rotatory power of cholesteric liquid crystal （ChLC）and blue phase liquid crystal （BPLC）are studied using finite-difference time-domain （FDTD）method. Firstly,the Bragg reflection of ChLC and BPLC is calculated,and the simulation results are discussed from the aspects of lattice structures and molecular arrangement.The effect of refractive index and pitch of liquid crystal on the Bragg reflection is also studied.The light leakage of the ChLC and BPLC sandwiched by the crossed polarizers is calculated,and the similar and different phenomena are ana-lyzed by the optical rotatory power of liquid crystal.