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Ultrawideband bandstop filter based on Fano resonance and rectangular resonators

机译：基于FANO谐振和矩形谐振器的超字段带BINDSTOP滤波器

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摘要

In this study, the effect of length of the stub on the formation of the Fano resonance in structures which possess a metal-insulator-metal (MIM) waveguide coupled to rectangular cavities by the stub is investigated theoretically and numerically. The resulting Fano resonance is used to design an ultrawideband bandstop filter that can filter all wavelengths between two telecommunication windows of lambda = 850 nm and lambda = 1310 nm. The structure is based on two rectangular cavities coupled to the MIM waveguide by stubs that are located at an adjusted distance from each other; the interference superposition of reflected and transmitted waves from each other will make this filtering phenomenon. The center wavelength of the bandstop of the structure is highly adjustable by changing the dimensions of the structure. The theoretical and the numerical results are, respectively, based on the transmission line model and the finite-difference time-domain method. The theoretical results comply well with the numerical ones. To analyze the Fano resonance, temporal coupled mode theory is also exploited. The proposed structure has significant applications in highly integrated optical circuits. (C) 2021 Optical Society of America
机译：在这项研究中，理论和数值研究了金属-绝缘体-金属（MIM）波导通过短截线耦合到矩形腔的结构中，短截线长度对Fano共振形成的影响。由此产生的Fano共振用于设计超宽带带阻滤波器，该滤波器可以滤除两个通信窗口（λ=850 nm和λ=1310 nm）之间的所有波长。该结构基于两个矩形腔体，通过短截线与MIM波导耦合，短截线彼此之间的距离可调整；反射波和透射波的干涉叠加会造成这种滤波现象。通过改变结构尺寸，结构带阻的中心波长高度可调。理论和数值结果分别基于传输线模型和时域有限差分法。理论计算结果与数值计算结果吻合较好。为了分析Fano共振，还利用了时间耦合模理论。这种结构在高度集成的光学电路中有重要的应用。（2021）美国光学学会

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  • 来源
    《Applied optics》 |2021年第14期|共7页
  • 作者

    Pooretemad Siavash; Malekijavan Alireza; Aslinezhad Mehdi;

  • 作者单位

    KN Toosi Univ Technol Fac Elect Engn Ctr Excellence Electromagnet Opt Commun Lab Tehran Iran;

    Shahid Sattari Aeronaut Univ Sci &

    Technol Dept Elect Engn Tehran 1384663113 Iran;

    Shahid Sattari Aeronaut Univ Sci &

    Technol Dept Elect Engn Tehran 1384663113 Iran;

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