提出了一种基于一维缺陷光子晶体的可调谐偏振滤波器，将液晶膜层作为缺陷引入对称结构的一维光子晶体中，利用液晶电控双折射效应的动态可调节性，实现可调谐的偏振光窄带滤波。用传输矩阵法对这一新型滤波器的TM偏振光传输特性进行了数值计算，结果验证了此滤波器的可调节性。这种可调谐偏振滤波器具有结构简单易于制作、体积小易于集成、调谐方便、损耗很低、透射峰半峰全宽窄等突出优点，有望在光通信波分复用技术和光学精密测量技术中获得应用。

A tunable polarization filter is proposed based on one-dimensional photonic crystal with nematic liquid crystal defect. Tunable polarization filtering can be realized dynamically by the electrically controlled birefringence of nematic liquid crystal. The transmission spectra of TM mode are numerically calculated using the transfer matrix method. The results show that the filter has good tunablilty and advantages of simple structure, small volume, easy adjustment, low wastage and narrow pass band. The results imply that this filter has potential applications for wavelength division multiplexing and precision optical measurement.