中文摘要：

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。

英文摘要：

In this work, based on metal-insulator-metal （MIM） waveguide, we design a surface plasmonic filter with slot depth modulated by a sinc function. Using the two-dimensional finite-difference time-domain （2D-FDTD） method, the effects of the geometrical parameters on the transmission characteristics of this surface plasmonic filter are numerically analyzed. The results show that, compared with the filter without the sinc function modulation, the right side of the forbidden band edge of the transmission spectrum of the filter with solt depth modulated by the sinc function is steeper and filter performance is better. The transmission characteristics are affected obviously by the maximum depth, the width, the number of periods of the slots, the width of the horizontal channel and the height of the sinc function, and indistinctively by the half-wide of the major petals of the sinc function. This kind of surface plasmonic filter will has have a certain application prospect in the high level of integration of optical circuit.