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依据玻璃、银和聚苯乙烯的折射率随波长变化而改变的性质,分析了不同波长入射光条件下表面等离子体共振(SPR)传感器的探测灵敏度。根据得到的实验数据,对玻璃、银和聚苯乙烯的折射率相对波长的变化进行了数据拟合,将拟合的结果用于理论计算,得到不同入射波长下表面等离子体共振传感器的探测灵敏度,提出了不同灵敏度要求下入射波长的优化选取。为了验证理论计算的结果,选取了波长为568nm和632.8nm的光源对样品进行了相关实验,发现波长632.8nm的入射光得到的样品表面形貌图相对波长为568nm的入射光得到的分辨率高,对细节的表现更加清晰。
The detection sensitivity of surface plasmon resonance (SPR) sensors at different wavelengths of incident light is analyzed based on the properties that the refractive indices of glass, silver and polystyrene change with wavelength. According to the obtained experimental data, the data of the relative wavelength of the refractive index of glass, silver and polystyrene are fitted and the results of the fitting are used in the theoretical calculation. The detection sensitivity of the surface plasmon resonance sensor under different incident wavelengths , Proposed the optimal selection of the incident wavelength under different sensitivity requirements. In order to verify the theoretical calculation results, we selected the light source with wavelength of 568nm and 632.8nm to do experiments on the samples. It is found that the surface topography of the sample with the wavelength of 632.8nm is higher than the resolution of the incident light with the wavelength of 568nm , The performance of the details more clearly.