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设计了一种基于金属-绝缘体-金属(MIM)波导的槽深受sinc函数调制的表面等离子滤波器,采用二维时域有限差分法(2D-FDTD)法,数值分析了这种表面等离子滤波器的几何结构参数对传输特性的影响。结果表明,与未经sinc函数调制的情形相比较,经sinc函数调制的滤波器的透射谱中位于禁带右侧的边缘变得更加陡峭,滤波性能更好。槽的最大深度、宽度、周期数、水平通道的宽度及sinc函数的高度对传输特性的影响较为明显,而sinc函数主花瓣的半宽对传输特性的影响较小。这种表面等离子滤波器在高集成度的光学回路中具有一定的应用前景。
A surface plasmon filter based on metal-insulator-metal (MIM) waveguides with slot depth modulated by sinc function was designed. The two-dimensional finite difference time domain (2D-FDTD) method was used to analyze the surface plasmon filter Influence of geometry parameters of the device on transmission characteristics. The results show that the edge of the transmission spectrum of the sinc function-modulated filter to the right of the forbidden band becomes steeper and the filtering performance is better than that of the case without the sinc function. The maximum depth, width, number of cycles, width of horizontal channel and the height of sinc function have obvious influence on the transmission characteristics. The half width of the main petals of sinc function has little influence on the transmission characteristics. This surface plasmon filter in the highly integrated optical circuit has a certain application prospects.