Independently tunable Fano resonances in a metal-insulator-metal coupled cavities system

Chen Yonghao; Chen Li; Wen Kunhua; Hu Yihua; Lin Weitao

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Independently tunable Fano resonances in a metal-insulator-metal coupled cavities system

机译：在金属绝缘体 - 金属耦合空腔系统中独立调谐的FANO共振

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Herein, multiple Fano resonances with excellent ability to be tuned independently are produced in a sub-wavelength metal-insulator-metal system. The input and output waveguides are separated by a metal gap, and a stub and an end-coupled cavity are placed below and to the right side of the input waveguide, respectively, as discrete states. Owing to the mode interferences, double ultra-sharp and asymmetric Fano resonant peaks are observed in the transmission spectrum. Successfully, the basic structure is extended by two extra rectangular cavities, giving rise to four Fano resonances with high refractive index sensitivity and figure of merit. Due to the discrete modes of Fano resonances from different coupling cavities, their resonant wavelengths can be controlled independently, which can provide greater flexibility for tuning Fano resonances. The performances of the proposed structure are investigated by both the finite-difference time-domain method and the multimode interference coupled-mode theory. It is believed that the research can provide important guidance in designing Fano resonance structures, and the proposed structure has a wide application in sensors, switches, and nano-photonic integrated circuit devices. (C) 2020 Optical Society of America.

机译：这里，在亚波长金属 - 绝缘体 - 金属系统中产生具有优异的多个扇形谐振，其能够独立地调谐。输入和输出波导通过金属间隙分开，并且分别作为离散状态分别放置在输入波导的下方和右侧的短截线和终端耦合腔。由于模式干扰，在传输光谱中观察到双重尖锐和不对称的扇形谐振峰。成功地，基本结构由两个额外的矩形空腔延伸，从而产生四个具有高折射率灵敏度和优异图谱的Fano共振。由于来自不同耦合腔的FANO共振的离散模式，可以独立地控制它们的谐振波长，这可以为调谐扇形共振提供更大的灵活性。通过有限差分时域方法和多模干扰耦合模式理论研究了所提出的结构的性能。据信，该研究可以在设计Fano谐振结构方面提供重要的指导，并且所提出的结构在传感器，开关和纳米光子集成电路器件中具有广泛的应用。（c）2020美国光学学会。

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《Applied optics》 |2020年第5期|共7页
作者
Chen Yonghao; Chen Li; Wen Kunhua; Hu Yihua; Lin Weitao;
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Guangdong Univ Technol Sch Phys &

Optoelect Engn Guangzhou 510006 Peoples R China;

Guangdong Univ Technol Sch Phys &

Optoelect Engn Guangzhou 510006 Peoples R China;

Guangdong Univ Technol Sch Phys &

Optoelect Engn Guangzhou 510006 Peoples R China;

Guangdong Univ Technol Sch Phys &

Optoelect Engn Guangzhou 510006 Peoples R China;

Guangdong Univ Technol Sch Phys &

Optoelect Engn Guangzhou 510006 Peoples R China;

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Independently tunable Fano resonances in a metal-insulator-metal coupled cavities system

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