具有大双折射特性的聚合物可构成多层反射镜 ,其反射率随入射角的增大保持不变或随之增大。这种多层干涉堆叠结构最重要的特征是 :厚度方向 (z向 )折射率的差异与膜的平面方向相关。这一差异产生一个变量 ,该变量决定了层间界面布儒斯特角的存在和大小 ,并控制确定多层堆叠光学 Polymers with large birefringence can form multilayer mirrors whose reflectivity remains constant or increases with increasing incident angle. The most important feature of this multilayer interference stack structure is that the difference in refractive index in the thickness direction (z direction) is related to the plane direction of the film. This difference produces a variable that determines the presence and size of Brewster's angle of the interfacial interface and controls the determination of multilayer optical stack