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在分析经典消逝波光波导生化传感器的基础上,为寻找性能更佳的传感器,探讨用更为直观的截止特性来进行生化传感。分别对三层及四层平板波导进行了研究,指出了作为基于截止特性的生化传感器三层波导结构存在的局限性。在理论上研究了可以在四层波导中使用变折射率材料来进行基于截止特性的生化传感,并给出了由空气隙、极化聚合物、高折射率薄膜、待测物组成的传感器结构示意图。用数值分析的方法绘出了此装置的灵敏度与高折射率薄膜厚度的关系曲线,并将它同经典消逝波光波导生化传感器灵敏度与薄膜厚度关系图进行了比较。结果表明,这种新型传感器理论上可以在较厚的薄膜结构中达到很高的灵敏度。
Based on the analysis of the classical evanescent waveguiding biochemical sensor, in order to find the sensor with better performance, the biochemical sensing with more intuitive cut-off characteristic is discussed. The three-layer and four-layer slab waveguides are respectively studied, and the limitations of the three-layer waveguide structure as the biochemical sensor based on the cutoff characteristic are pointed out. In theory, we can use the variable refractive index material in the four-layer waveguide to carry out the biochemical sensing based on the cut-off characteristics and give the sensor composed of the air gap, the polarized polymer, the high refractive index film and the analyte Schematic. The relationship between the sensitivity of the device and the thickness of high refractive index film is plotted by numerical analysis and compared with the sensitivity and film thickness of the classical evanescent waveguiding biochemical sensor. The results show that this new type of sensor theoretically achieves high sensitivity in thicker film structures.