光子晶体齿状波导的滤波特性研究

Study on filtering characteristics based on tooth-shaped photonic crystal waveguide

为了设计基于光子晶体波导的高性能滤波器件,在2维正方格子光子晶体波导结构中引入一系列齿状缺陷,采用有限元法对齿状光子晶体波导的传输特性进行了数值仿真和理论分析。结果表明,对于单个齿状缺陷,缺陷产生的共振频率使得在光子晶体波导通频域带出现带隙结构,可以实现良好的窄带滤波,并且通过改变齿状缺陷深度可以有效地控制缺陷的共振频率;引入多个齿状缺陷,缺陷之间会经过耦合作用形成一系列缺陷态,使得在光子晶体波导导通频域中出现宽带的带隙结构,可以实现宽带滤波。该光子晶体波导滤波器对窄/宽带滤波可根据波导结构中引入的齿状缺陷进行简单灵活调节。此研究在设计基于光子晶体波导的光子滤波器件方面具有潜在的应用价值。

In order to design high performance filters based on photonie crystal waveguide, new band-stop filter was proposed by introducing a series of tooth-shaped defects into 2-D photonic crystal waveguide. Transmission characteristics of tooth-shaped photonic crystal waveguide were studied by finite element method. The results show that, for single tooth-shaped defect, resonance frequency generated by defect leads to a band-stop structure and good narrowband filter is achieved. Resonance frequency can be modulated by changing the depth of defect. For multiple tooth-shaped defects, due to the coupling effect, a series of defects form a wide band stop of photonic crystal waveguide with relatively wider bandwidth. Photonic crystal waveguide filters can be simple and flexible adjustment by introducing tooth-shaped defects to achieve narrow/broadband filters. The study has potential value in the design of photonic filter devices based on photonic crystal waveguides.