带有T型腔的MIM波导的法诺共振特性研究

设计了一种带有枝节的金属-介质-金属(MIM)波导与T型谐振腔侧耦合的表面等离子体光波导结构。利用有限元法(FEM)，数值分析了改变耦合距离、T型腔几何尺寸及其不对称性、枝节高度对法诺(Fano)共振谱线的影响。结合电磁场分布进一步揭示了Fano共振现象产生的物理机理，由此可以动态调节表面等离子体波在结构中传输时产生的Fano共振特性。另外，研究表明在T型腔内填充不同折射率的材料，利用所设计的波导结构可以实现灵敏度高达940 nm/RIU的纳米尺度的折射率传感器。最后研究了结构的慢光传输特性，可以在Fano峰值附近实现约0.025 ps的光学延迟。这种新型的表面等离子体光波导可能会在光子器件集成、慢光效应及纳米传感领域有着较大的应用前景。

Abstract

We designed a simple Fano resonant structure composed of a metal-insulator-metal (MIM) plasmonic waveguide with a stub side-coupled to a T-shaped cavity.The finite element method (FEM) was used when the dependences of the electromagnetic field distribution and the Fano spectra on the coupling distance， the size and asymmetry of the T cavity and the height of the stub are analyzed numerically to further reveal the physical mechanism of the Fano resonance. Based on the results， a dynamically adjustable plasmonic Fano resonance can be obtained. In addition， studies also show that by changing the refractive index of the materials filled in the T-shaped cavity， a sensor of high sensitivity of about 940nm/RIU can be achieved in terms of the proposed waveguide structure. The investigation of the slow light properties shows that one can achieve decay time of about 0.025ps in the vicinity of the Fano peak. This new type of surface plasmon optical waveguide can have wide applications in the field of photonic device integration， slow light effects and nano sensing.

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吴敌, 殷俊, 田晋平, 杨荣草. 带有T型腔的MIM波导的法诺共振特性研究[J]. 量子光学学报, 2018, 24(1): 55. WU Di, YIN Jun, TIAN Jin-ping, YANG Rong-cao. Study on the Characteristics of Fano Resonance in MIM Waveguide side-Coupled with a T-shaped Cavity[J]. Acta Sinica Quantum Optica, 2018, 24(1): 55.

带有T型腔的MIM波导的法诺共振特性研究

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