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介绍了一种偏振控制光强调制型点阵表面等离子体共振(SPR)传感器,分析了入射角度、金膜厚度、起偏器设置、光源波长及数据处理方式对传感器灵敏度和线性范围的影响,并对632.8 nm与740 nm两种光源传感器系统进行了实验测试与分析。结果表明,偏振控制光强调制型点阵SPR传感器可将光经过表面等离子体共振所产生的偏振态变化转化为光强变化来测量,选取适合的光源波长和入射角度,采用简单的光学结构与机械结构,就能使其获得较高的灵敏度,且测量范围控制方便,制作成本较低。偏振控制光强调制型点阵SPR传感器可广泛应用于生物分子相互作用分析和环境监测、食品安全、药物分析、生物医疗等领域的高通量检测。
A polarization modulated light intensity modulated surface plasmon resonance (SPR) sensor is introduced. The effects of incident angle, gold film thickness, polarizer setting, light source wavelength and data processing mode on the sensitivity and linear range of the sensor are analyzed. The experiment and analysis of two light source sensor systems at 632.8 nm and 740 nm were carried out. The results show that the Polarization Modulated SPR sensor can measure the change of the light polarization caused by the surface plasmon resonance, and choose the suitable wavelength and angle of light source. The simple optical structure and Mechanical structure, it can make it higher sensitivity, and the measurement range control convenience, lower production costs. Polarization-Controlled Light Modulation Dot-matrix SPR sensors are widely used in high-throughput detection of biomolecular interaction analysis and environmental monitoring, food safety, drug analysis, biomedicine and other fields.