偏振干涉角度调制SPR传感技术研究及应用进展

Research on the Surface Plasmon Resonance Sensor for Gas Monitoring

针对一种新兴生物检测方法——表面等离子体波共振(SPR)技术,文中SPR传感系统采用偏振干涉和角度调制方案,使SPR传感灵敏度与光复反射系数的模和相位都相关,从而实现较大线形范围内的高灵敏测量。同时开展了该SPR传感系统在环保领域的应用研究,SPR共振信号可实时随甲烷含量线性改变,气体检测灵敏度达到1 070ppm,实验结果验证了这种SPR传感技术的检测性能并显示了其在环保监测领域的应用潜力。

This paper focuses on a rising biomedical optical technique-Surface Plasmon Resonance(SPR).Our SPR sensor uses polarization interferometer and angle modulation techniques.Theoretical analysis shows that our sensing system can accomplish a high resolution measurement of refractive index in a wide linear range,and the sensitivity is correlated with the modulus and phase of the complex reflection coefficient.We also study the application of our SPR sensors in environmental monitoring.Experimental results show a good linear relationship between methane concentrations with SPR signal,and the system has a sensitivity of 1070ppm,which confirms the feasibility of our SPR technique and practical potential in gas detection.