光子学报, 2016, 45 (11): 1113003, 网络出版: 2016-12-06
基于耦合T型空腔的多重法诺共振现象
Phenomenon of Multiple Fano Resonances Based on Coupled T-type Cavity
波导 表面等离子激元 法诺共振 T型谐振腔 传输谱 品质因数 光学传感与传感器 Waveguide Surface plasmon polariton Fano resonance T-type resonator Transmission spectrum Figure of merit Optical sensing and sensors
摘要
提出由T型空腔和挡板组成的两种金属-电介质-金属(MIM)波导结构, 分别为: 正T型空腔结构和倒T型空腔结构, 并应用有限元法系统地研究了该结构的透射特性.对于正T型空腔结构, 仿真结果出现了双重法诺共振现象, 并且共振波长可以通过改变T型空腔长度和高度进行调节.该结构有助于设计成敏感度达到1 620 nm/RIU、品质因数为5.4×104的纳米传感器.对于倒置T型空腔, 在波导中产生了多重法诺共振现象, 其敏感度可达1 560 nm/RIU, 品质因数为9.37×104.该结构有望在光学集成回路, 特别是纳米传感器、光束分路器方面具有广泛应用.
Abstract
Two Metal-Insulator-Metal (MIM) waveguide structures that consists of T-type cavity and baffle were proposed, and they are the positive T-type cavity structure and the inverted T-type cavity structure respectively. The transmission characteristics of this structure were calculated by using the Finite-Element Method(FEM). The simulation results show the double Fano resonances for the positive T-type cavity structure, and the resonant wavelength can be easily tuned by changing the length and the height of the T-type cavity.The structure would be helpful for designing the nano-sensor with a sensitivity of 1620 nm/RIU and the figure of merit of 5.4×104.By inverting the T-type cavity, multiple Fano resonances are observed in the waveguide with a sensitivity of 1560 nm/RIU and the figure of merit of 9.37×104. The waveguide structure may have wide applications in highly integrated optical circuits , especially for nano-sensor and spectral splitter.
安厚霖, 张冠茂, 胡南, 石悦, 王志爽. 基于耦合T型空腔的多重法诺共振现象[J]. 光子学报, 2016, 45(11): 1113003. AN Hou-lin, ZHANG Guan-mao, HU Nan, SHI Yue, WANG Zhi-shuang. Phenomenon of Multiple Fano Resonances Based on Coupled T-type Cavity[J]. ACTA PHOTONICA SINICA, 2016, 45(11): 1113003.
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