不同波长下表面等离子体共振传感器的灵敏度

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。

Sensitivity of Surface Plasmon Resonance Sensor for Different Wavelengths

According to the refractive index change of glass, sliver and polystyrene for different incident wavelengths, the sensitivity of surface plasmon resonance (SPR) sensor for different wavelengths were analyzed. The experimental data are used to fit the refractive index change of glass, sliver and polystyrene with wavelength, and the SPR sensor sensitivity under different wavelengths was achieved by application of the fit result in theoretical calculation. The optimized wavelengths under different sensitivity requirement of SPR sensor were proposed. To prove the theoretical result, the light sources with wavelengths of 568 nm and 632.8 nm were applied to SPR sensor. The two light sources were used to achieve sample surface morphology, and the result was found that the detail of sample was better presented by the light source with wavelength of 632.8 nm than that with 568 nm wavelength.