Tunable Fano resonance in MDM stub waveguide coupled with a U-shaped cavity
Tunable Fano resonance in MDM stub waveguide coupled with a U-shaped cavity
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DOI：
10.1140/epjd/e2018-80734-6
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发表时间：
2018-04
期刊：
影响因子：
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通讯作者：
Xingchun Yi;Jinping Tian;Rongcao Yang
中科院分区：
文献类型：
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作者：
Xingchun Yi;Jinping Tian;Rongcao Yang
本文提出了一种由短截线和U型腔耦合组成的新型金属-介质-金属波导系统，它能产生尖锐的非对称Fano谐振。利用有限元法对该结构的传输特性进行了数值研究，并通过耦合模理论进行了验证。仿真结果表明，可以很容易地通过调整结构的几何参数的光谱轮廓进行调整。一个潜在的应用所提出的结构作为一个高效的等离子体折射率纳米传感器进行了研究，其灵敏度超过1000 nm/RIU和高达5500的品质因数。另一个应用是群指数可以大于6的集成慢光器件。此外，通过增加另一个U形腔或（和）短截线，将在宽带传输谱中出现多个Fano谐振。所提出的结构的特点是非常有前途的高性能滤波器，芯片上的纳米传感器，和慢光器件。图形摘要
AbstractA new compact metal-dielectric-metal waveguide system consisting of a stub coupled with a U-cavity is proposed to produce sharp and asymmetric Fano resonance. The transmission properties of the proposed structure are numerically studied by the finite element method and verified by the coupled mode theory. Simulation results reveal that the spectral profile can be easily tuned by adjusting the geometric parameters of the structure. One of the potential application of the proposed structure as a highly efficient plasmonic refractive index nanosensor was investigated with its sensitivity of more than 1000 nm/RIU and a figure of merit of up to 5500. Another application is integrated slow-light device whose group index can be greater than 6. In addition, multiple Fano resonances will occur in the broadband transmission spectrum by adding another U-cavity or (and) stub. The characteristics of the proposed structure are very promising for the highly performance filters, on-chip nanosensors, and slow-light devices.Graphical abstract