利用EastFDTD研究基于金属谐振环的新型滤波器

Simulation of a metal ring resonator based filter with EastFDTD

基于金属表面等离子体空间局域非辐射特性,利用电磁场仿真软件EastFDTD和时域有限差分法(FDTD)设计了一种新型滤波器。通过金属谐振环结构中内径分别为175 nm和145 nm金属环对谐振波长的调控作用,在中红外波段不同端口实现了分别输出1.85μm和1.58μm波长的信号,相邻端口之间的串扰可以达到-19 dB,同时输出端口的结构尺寸仅为50 nm。计算结果表明该新型滤波器在滤波性能和器件小型化集成化方面均具有显著优势。

Taking the advantages of the localized and non-radiative properties of surface plasmon,we designed a novel filter by electromagnetic simulation software EastFDTD.This new kind of filter is formed by two metal ring resonators,the inner diameters of the two metal ring resonators are 175 nm and 145 nm respectively,and the wavelengths of surface plasmon meeting the resonance are different.Such characteristic of metal ring resonator results in outputting signals of 1.85 μm and 1.58 μm at different ports.The crosstalk between adjacent ports of this filter can reach-19 dB with the output port width of 50 nm.The result shows that this novel filter has more advantages than traditional filters in filtering performance,size and integration.