基于波长寻址的表面等离子体共振传感技术

A Novel Surface Plasmon Resonance Sensing Technology Based on Wavelength-addressing

本文提出了基于光谱扫描技术的非机械扫描的表面等离子体共振(SPR)传感技术,采用白光为SPR激发光源,通过单色仪控制入射光的波长实现光谱寻址,在保证灵敏度和动态范围的同时,使系统在整个动态范围内具有较好的线性,简化了传感器结构。理论分析了光谱扫描SPR传感技术的灵敏度和动态范围,搭建了实验系统,并测量了不同浓度的酒精水混合溶液的SPR信号变化。结果表明:系统折射率测量范围为1.30-1.38,灵敏度可达3.1×105RIU。

In this paper,a novel surface plasmon resonance （SPR）sensing technique with both a wide dynamic detec-tion range and high sensitivity based on wavelength-addressing （WA-SPR）is presented.A white-light source is used for SPR excitation and the monochromator is used to address the resonance wavelength without any arm-scanning.The dy-namic detection range and sensitivity of SPR sensor are theoretically analyzed respectively,and the principle setup is built.In order to test the effectiveness of our SPR sensor,we detect alcohol solutions with different concentration.Experi-mental results show that the sensitivity of our SPR sensor is 3.1 ×10^-5 RIU with a refractive index range of 1.30-1.38.