提出了一种新型缺陷位移光子晶体全光开关。基质光子晶体通过在硅介质上构造三角形周期排列的空气孔形成，同时引入线缺陷和点缺陷，获得了一种具有高品质缺陷模的光子晶体点、线混合缺陷结构。在此基础上，通过点缺陷处填充克尔型非线性光学介质有机聚合物含对甲苯磺酸取代基的聚二乙炔（PDA-PTS），调节控制光使缺陷模发生动态迁移，从而实现对信号光的通断控制。采用时域有限差分法（FDTD）进行仿真计算。分析结果表明，开关消光比大，阈值低，响应时间快。该缺陷位移光子晶体全光开关对于未来高速全光通信和光计算技术的应用具有重要学术意义。

A new type of photonic crystal all-optical switching based on the dynamical shift of defect mode has been designed. This photonic crystal is triangular lattice with circular air holes in silicon, in which line defects and point defects are included. A photonic crystal structure introducing both point and line defects which has quality defect mode is designed. After that, point defects have been filled with the Kerr nonlinear optical materialpolydiacetylene para-toluene sulfonate (PDA-PTS). With regulating the control light, the defect mode brings the dynamical shift, and accordingly it can be controled the signal light on and off. The two-dimensional finite-difference time-domain (FDTD) calculation has been used to numerical demonstration. The results show that the switch has great extinction ratio, low threshold power density, and fast switching time. The photonic crystal all-optical switching based on the dynamical shift of defect mode has an important academic significance to the high-speed all-optical communications, as well as the optical computing technology in the future.