设计了一种基于金属介质金属表面等离极化激元(SPPs)波导的内嵌十字形金属结构的圆形谐振腔，并应用时域有限差分算法数值研究了其滤波特性。结果发现，旋转后的十字形结构破坏了圆形空腔的共振模式，从而显现出新颖的滤波特性。内嵌十字形金属结构圆形谐振腔的滤波特性依赖于十字形结构的旋转角度，相对于θ=0°的内嵌十字形结构，当十字形结构旋转到某一特定角度时，透射光谱中仅有一个透射峰。此外，内嵌十字形结构圆形谐振腔的滤波特性还强烈地依赖于十字形结构的尺寸。这些结果有助于设计复合结构滤波器，满足特定的滤波需要。

A circular resonator embedded with the cross structure based on the metal-insulator-metal surface plasmon polaritons (SPPs) waveguide is designed. The filter properties of this composite resonator are numerically investigated by the finite-difference time-domain method. The results show that the rotated cross structure destroys the symmetry of the resonant mode of SPPs in the empty circular cavity, which results in novel filter function of the complex resonator. The filter function of a circular resonator embedded with the cross structure depends on the rotating angle of the cross structure. Compared to θ=0° case, when the cross structure rotate to a certain angle, there is only one transmission peak in the transmission spectra. In addition, the filter properties of the composite resonator are strongly dependent on the cross structure size. These results will be helpful for designing composite filters with specific usage.