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在考虑液晶(LC)双折射效应和旋光效应的基础上,探究了不同预倾角和扭曲角下向列相LC滤波片的输出特性,导出了其透射率表达式,并用Matlab软件对其进行了数值模拟分析和实验测试。结果表明,随着扭曲角的增大,LC滤波片的透射峰值向长波方向移动;随着预倾角的增大,LC滤波片的透射峰值向短波方向移动且其移动速率随波长变化,波长越短移动速率越小;若增大下基板预倾角,减小上基板预倾角(或者减小下基板预倾角,增大上基板预倾角)则其透射峰值向短波方向的移动速率会减弱;当下基板预倾角的增量值与上基板预倾角的减量值(或者下基板预倾角的减量值与上基板预倾角的增量值)之比约为1.2时,其透射峰的中心波长将不会发生漂移。通过实验,进一步验证了理论结果的正确性。
Based on the birefringence and rotation effect of liquid crystal (LC), the output characteristics of nematic LC filters under different pretilt angles and twist angles were investigated, and the transmissivity expressions were derived. Numerical simulation analysis and experimental test. The results show that as the twist angle increases, the transmission peak of the LC filter shifts to the long wave direction. With the increase of the pretilt angle, the transmission peak of the LC filter moves to the short wavelength and the moving speed changes with the wavelength. The wavelength If the pre-tilt angle of the lower substrate is increased, the pre-tilt angle of the upper substrate is decreased (or the pre-tilt angle of the lower substrate is decreased, and the pre-tilt angle of the upper substrate is increased), the movement speed of the peak of the transmission to the short-wave direction is decreased; The ratio of the incremental value of the pre-tilt angle of the substrate to the decrement of the pre-tilt angle of the upper substrate (or the ratio of the decrement of the pre-tilt angle of the lower substrate to the pre-tilt angle of the upper substrate) is about 1.2 Will not drift. Through experiments, the correctness of the theoretical results is further verified.