Yang Xiaoyu, Hua Ertian, Su Hao, Guo Jing, Yan Shubin
School of Instrument and Electronics, North University of China, Taiyuan 030051, China.
School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Key Laboratory for Technology in Rural Water Management of Zhejiang Province, Hangzhou 310018, China.
Sensors (Basel). 2020 Jul 24;20(15):4125. doi: 10.3390/s20154125.
Herein, a nanosensor structure is proposed, which comprises metal-insulator-metal (MIM) waveguide with stub and circular ring cavity with a stub (CRCS). The phenomenon of Fano resonance appears in the transmission spectrum, which is formed by interaction between the narrowband mode of CRCS and broadband mode of stub on bus waveguide. The influence of geometric asymmetry on mode splitting of Fano resonance was discussed. The mode splitting of Fano resonance can vastly improve figure of merit (FOM) with a sight decrease of sensitivity. The best performance of the refractive-index nanosensor is attained, which is 1420 nm/RIU with a high FOM of 76.76. Additionally, the application of designed structure on temperature sensing was investigated, which has sensitivity of 0.8 nm/°C. The proposed structure also possesses potential applications on other on-chip nanosensors.
在此，提出了一种纳米传感器结构，其包括带有短截线的金属-绝缘体-金属（MIM）波导和带有短截线的圆环腔（CRCS）。在传输光谱中出现了法诺共振现象，它是由CRCS的窄带模式与总线波导上短截线的宽带模式之间的相互作用形成的。讨论了几何不对称对法诺共振模式分裂的影响。法诺共振的模式分裂可以在灵敏度略有下降的情况下极大地提高品质因数（FOM）。获得了折射率纳米传感器的最佳性能，为1420 nm/RIU，具有76.76的高FOM。此外，研究了所设计结构在温度传感方面的应用，其灵敏度为0.8 nm/°C。所提出的结构在其他片上纳米传感器方面也具有潜在应用。
