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基于圆弧谐振腔的金属-介质-金属波导滤波器的数值研究
Numerical investigation of the metal-insulator-metal waveguide filter based on the arc-shaped resonator
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摘要: 设计了一个基于圆弧谐振腔的金属．介质．金属波导滤波器，并应用时域有限差分算法数值研究了它的传播特性．结果发现，在透射光谱中出现了明显的透射峰。分析表明，该透射峰是由表面等离极化激元在圆弧腔中的谐振所导致．我们还研究了圆弧谐振腔的结构参数及其弯曲方向对其传播特性的影响．此外，该结构还可以用作一种光分路器，实现滤波与分路的双重功能．Abstract: A metal-insulator-metal waveguide with an arc-shaped resonator is designed, and the transmission properties are numerically investigated by the finite-difference time-domain method. The results show that the transmission peaks in the transmission spectra result from the resonance of the surface plasmon polaritons in the arc-shaped resonator. The effects of the structural parameters of the arc-shape resonator on the transmission properties are also studied. In addition, this structure can also act as a splitter and achieve a dual function of filter and splitter for subwavelength waveguide.
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