基于金属-绝缘体-金属波导耦合双矩形腔的法诺共振用于表面等离子体纳米传感器
Fano Resonance Based on Metal-Insulator-Metal Waveguide-Coupled Double Rectangular Cavities for Plasmonic Nanosensors.
作者信息
Zhang Zhidong, Luo Liang, Xue Chenyang, Zhang Wendong, Yan Shubin
机构信息
Science and Technology on Electronic Test & Measurement Laboratory, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China.
Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Eduction, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China.
出版信息
Sensors (Basel). 2016 May 5;16(5):642. doi: 10.3390/s16050642.
A refractive index sensor based on metal-insulator-metal (MIM) waveguides coupled double rectangular cavities is proposed and investigated numerically using the finite element method (FEM). The transmission properties and refractive index sensitivity of various configurations of the sensor are systematically investigated. An asymmetric Fano resonance lineshape is observed in the transmission spectra of the sensor, which is induced by the interference between a broad resonance mode in one rectangular and a narrow one in the other. The effect of various structural parameters on the Fano resonance and the refractive index sensitivity of the system based on Fano resonance is investigated. The proposed plasmonic refractive index sensor shows a maximum sensitivity of 596 nm/RIU.
提出了一种基于金属-绝缘体-金属（MIM）波导耦合双矩形腔的折射率传感器，并使用有限元方法（FEM）进行了数值研究。系统地研究了该传感器各种配置的传输特性和折射率灵敏度。在传感器的传输光谱中观察到一种不对称的法诺共振线形，这是由一个矩形中的宽共振模式与另一个矩形中的窄共振模式之间的干涉引起的。研究了各种结构参数对法诺共振以及基于法诺共振的系统折射率灵敏度的影响。所提出的等离子体折射率传感器显示出最大灵敏度为596 nm/RIU。
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