为了获得拥有滤波功能的带阻滤波器，并实现宽带滤波，本研究设计了一种金属-绝缘体-金属(metal-insulator-metal，MIM)混合等离子体波导，其结构由双羊角钉谐振腔与MIM直波导组成。本文采用时域有限差分法(finite difference time domain，FDTD)计算了此结构的传输光谱特性和z方向磁场分布图，计算结果表明在两个法诺共振峰之间形成了有带阻滤波特性的U字型区域，其滤波的带阻宽度可达0。99 μm，实现了宽带滤波功能。基于结构的可协调性，调节双羊角钉谐振腔之间的距离L、高度H以及半径R可以改变共振波长和带阻波段。此外，在添加新的羊角钉谐振腔并形成级联结构后，可以获得新的法诺共振峰，并提高了带阻滤波特性，本研究得到的结构特性可以为带阻滤波器与传感器等光学器件的设计提供思路。
Research on double sheep horn pin plasma broadband band stop filter
In order to obtain a band stop filter with filtering function and achieve broadband filtering,this study designed a metal-insulator-metal(MIM)hybrid plasma waveguide,its structure consists of a double sheep horn pin resonator and an MIM straight waveguide.The transmission spectrum characteristics and z-direction magnetic field distribution of this structure were calculated using the finite difference time domain(FDTD)method.The calculation results indicate that a U-shaped region with band stop filtering characteristics is formed between the two Fano-resonance peaks,its filtering band stop width can reach 0.99 pm,achieving broadband filtering function.Based on the tunability of the structure,adjusting the distance L,height H,and radius R between the double sheep horn pin resonators can change the resonance wavelength and band stop band.In addition,by adding a new sheep horn pin resonator and forming a cascaded structure,a new Fano-resonance peak can be obtained and the band stop filtering characteristics can be improved.The structural characteristics obtained in this study can provide ideas for the design of optical devices such as band stop filters and sensors.
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