基于三矩形谐振腔非通 MIM 波导的四重法诺传感. (Chinese)

Quadruple Fano Sensing Based on Three Rectangular Resonant Cavity Non pass MIM Wave guide. (English)

In order to obtain a highly sensitive biosensor, in this paper, a non pass metal insulator metal (MIM) wave guide sensor that can excite quadruple Fano resonance is designed. The top and bottom symmetric structure is adopted, and a vertical rectangular cavity and two horizontal rectangular cavities interact with the bus wave guide to obtain the quadruple Fano resonance. The finite difference time domain (FDTD) method is used to calculate the transmission characteristics of the structure and the normalized magnetic field in the Z direction, and the mechanism of its Fano resonance is analyzed in detail. By calculating the transmission spectrum adjusted by the structural geometric parameters, it is obtained that the transmission and resonance position of the four Fano resonance peaks can be independently adjusted by changing the structural geometric parameters. In addition, it was found that adding different concentrations of glucose solutions to the structure can achieve high refractive index sensing sensitivity (S), the highest sensitivity can reach 2736.98nm/RIU, indicating that this structure has high sensitivity to changes in refractive index, This provides a new approach for designing and optimizing nanometre scale refractive index sensors, which can be applied for performance testing before circuit construction. [ABSTRACT FROM AUTHOR]

为了得到高灵敏度的生物传感器，设计了-种可以激发出四重法诺共振的非通金属-绝缘体-金属 (Metal-Insulator-Metal, MIM) 波导传感器。采用了上下对称结构，由-个竖放矩形谐振腔和两个横放矩形谐振腔与总线波导共同作用而得到了四重法诺共振。采用了有限时域差分方法计算了此结构的传输特性与Z方向的归-化磁场，并详细分析了其法诺共振的产生机理。通过计算结构几何参数调节后的透射光谱，从而得出了四处法诺共振峰透射率和共振位置可以通过改变结构几何参数而获得独立调节。此外还发现在结构中添加不同浓度的葡萄糖溶液可以实现高折射率传感灵敏度(S)，获得最高灵敏度2736.98nm/RIU，可以看出此结构对于折射率变化有很高的灵敏度，这为设计和优化纳米级别的折射率传感器提供了新的思路，还可以应用于电路构建前进行性能测试. [ABSTRACT FROM AUTHOR]

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