常规棱镜表面等离子体共振(SPR)传感器检测系统共振波谷浅且谷底平坦,从而导致共振波长不易确定。在常规棱镜SPR传感器系统基础上,加入偏振分光棱镜(PBS),构建了一种新型棱镜SPR传感器系统。对PBS的分光带宽展宽进行了研究,提出了基于膜系设计的展宽方法。在无水乙醇检测的实验中,滤除s偏振光后,共振波谷谷底曲率半径由86.2394减小到39.3990,近似减少为滤除s偏振光之前的1/2,这与理论分析相吻合。采用常规和新型棱镜SPR检测系统分别对折射率在1.32-1.39内的6种液体进行了测量,分辨率从1.62×10－4提高到1.55×10－4。该系统能较好地滤除s偏振光,使得共振波谷更加尖锐,从而提高共振光谱的检测精度。

In the traditional prism surface plasmon resonance (SPR) sensor system,the resonance trough is shallow and the valley is smooth,which causes the resonant wavelength difficult to determine. A novel detecting system is built which added a polarized beam splitter (PBS) based on traditional prism SPR sensor system. In the experiment of alcohol detection,when the S polarized light is filtered,the resonance radius of curvature decreases from 86.2394 to 39.3990,similar to the S polarized light presenced′s 50%,which coincides with the theoretical analysis. Traditional and novel prism SPR sensor system is used to measure 6 kinds of liquid whose refractive index is 1.32-1.39. The resolution ranges from 1.62×10－4 to 1.55×10－4. The detecting system with filter S polarized light that doesn′t excite SPR effect,which making a more acute resonance trough,thus detecting system has been improved.