有效抑制光子晶体加载矩形谐振腔中模式竞争的方法

研究了光子晶体加载矩形谐振腔，针对传统光子晶体加载无法完全抑制模式竞争的问题，提出了特性阻抗和介质加载方法进行改进，完全实现了谐振腔的高次模式的单模工作，为抑制高次模式工作的谐振腔中模式竞争的问题提供了一种新方法.在此基础之上，采用解析方法以及高频仿真软件HFSS，设计了一个采用TM₅₃₀高次模式工作的传统光子晶体加载的谐振腔，进一步采用了该新方法对其进行改进，并深入分析了采用这种方法抑制模式竞争的物理原因.计算结果表明，新方法能有效抑制模式竞争，实现谐振腔的高次工作模式的单模工作. 关键词： 光子晶体 谐振腔 模式竞争 特性阻抗

An effective method for suppressing the mode competition in a rectangular cavity loaded with photonic crystals

In this paper, the photonic crystal loaded rectangular resonant cavity is studied. Because the conventional way cannat ensure single-mode operation in the cavity when operated with higher-order modes, characteristic impedance method and perturbation method are employed to change the structure of the conventional photonic crystals cavity. The improved cavity that can work with a single higher-order mode is realized. On this basis, the conventional photonic crystal shielded cavity, which can work with a mode of TM₅₃₀, is reformed by the new method. The new structures are analyzed by using analytical methods and HFSS. The physical reasons of these methods solving the problem of mode competition are also analyzed. The investigation reveals that the method can effectively suppress mode competition and realize single-modc operation in the cavity when operated with higher-order modes.