Yu Yaxin, Cui Jiangong, Liu Guochang, Zhao Rongyu, Zhu Min, Zhang Guojun, Zhang Wendong
State Key Laboratory of Dynamic Testing Technology, North University of China, Taiyuan 030051, China.
Micromachines (Basel). 2021 Nov 3;12(11):1359. doi: 10.3390/mi12111359.
To reduce the loss of the metal-insulator-metal waveguide structure in the near-infrared region, a plasmonic nanosensor structure based on a racetrack resonant cavity is proposed herein. Through finite element simulation, the transmission spectra of the sensor under different size parameters were analyzed, and its influence on the sensing characteristics of the system was examined. The analysis results show that the structure can excite the double Fano resonance, which has a distinctive dependence on the size parameters of the sensor. The position and line shape of the resonance peak can be adjusted by changing the key parameters. In addition, the sensor has a higher sensitivity, which can reach 1503.7 nm/RIU when being used in refractive index sensing; the figure of merit is 26.8, and it can reach 0.75 nm/°C when it is used in temperature sensing. This structure can be used in optical integrated circuits, especially high-sensitivity nanosensors.
为了减少金属 - 绝缘体 - 金属波导结构在近红外区域的损耗，本文提出了一种基于跑道形谐振腔的等离子体纳米传感器结构。通过有限元模拟，分析了传感器在不同尺寸参数下的透射光谱，并研究了其对系统传感特性的影响。分析结果表明，该结构可以激发双Fano共振，其对传感器的尺寸参数具有独特的依赖性。通过改变关键参数可以调整共振峰的位置和线形。此外，该传感器具有较高的灵敏度，用于折射率传感时可达1503.7 nm/RIU；品质因数为26.8，用于温度传感时可达0.75 nm/°C。这种结构可用于光集成电路，特别是高灵敏度纳米传感器。
