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为了在表面等离子体共振(SPR)传感器中提高信噪比、灵敏度等,需要使光波尽可能多地和表面等离子体波(SPP)相耦合。主要研究了如何通过改变金属光栅结构以增强SPR共振峰从而提高其SPR传感器的灵敏度。在选定一维矩形光栅面型的基础上,通过改变光栅结构及面型参数,寻找入射光波与表面等离子体波耦合度最大时的面型参数值。将基本光栅面型函数分解展开并逐项分析其对表面等离子体共振的影响,针对已优化的一维矩形金属光栅面型函数,分析其傅里叶展开式中各项对等离子体耦合的贡献,以期为进一步寻求光能量最大耦合的物理本质提供分析支持。
In order to improve the signal-noise ratio, the sensitivity, and the like in the surface plasmon resonance (SPR) sensor, it is necessary to couple the optical wave as much as possible to the surface plasmon wave (SPP). The main research is how to improve the sensitivity of SPR sensor by changing the structure of metal grating to enhance the SPR formant. Based on the selected one-dimensional rectangular grating surface type, the parameters of the grating type and surface type are changed to find the maximum value of the surface parameter when the coupling degree of the incident light wave and the surface plasmon wave is maximum. The basic grating surface function was decomposed and explored one by one to analyze its influence on surface plasmon resonance. According to the optimized one-dimensional rectangular metal grating surface shape function, the contribution of the Fourier expansion to the plasmon coupling was analyzed , With a view to providing analytical support for further seeking the physical nature of maximum coupling of light energy.