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利用射频溅射技术在平面单模玻璃波导表面局部淀积一层Ta_2O_5梯度薄膜,形成复合光波导芯片,结合棱镜耦合法制备了一种集成光偏振干涉传感器.基于四层平板波导模型理论分析了复合光波导表面折射率灵敏度S_(RI)与Ta_2O_5梯度薄膜等效厚度T_(eq)的关系,结合实验测定的S_(RI)得出了本工作中所使用Ta_2O_5梯度薄膜的T_(eq)≈33.021 nm,进一步得出芯片吸附层厚度灵敏度S_(ad)≈(2.412×2π)nm~(-1).利用该复合波导偏振干涉仪结合Lorentz-Lorenz有效介质理论测得了市售食用白醋中醋酸的浓度,并以市售牛栏山二锅头洒为例进行了白酒掺水和掺甲醇的测试,结果表明,白酒掺水或甲醇前后的折射率改变量与掺杂量成准线性变化关系;原位实时监测了丁酰胆碱酯酶的动态吸附过程及细胞色素c/聚苯乙烯磺酸钠的分子自组装过程,并利用测得的位相差变化结合芯片吸附层厚度灵敏度S_(ad)获得了蛋白质表面覆盖度.
A layer of Ta_2O_5 gradient film was partially deposited on the surface of the single-mode glass waveguide by RF sputtering to form a composite optical waveguide chip, and an integrated optical polarization interferometric sensor was fabricated by prism coupling method.Based on the four-layer slab waveguide model theory The relationship between the refractive index sensitivity of the composite optical waveguide S RI and the equivalent thickness T eq of the Ta 2 O 5 gradient film was obtained, and the T_ (eq) ≈ of the Ta_2O_5 gradient film used in this work was obtained by the experimentally determined S_ (RI) 33.021 nm, and the thickness sensitivity of the adsorbed layer S_ (ad) ≈ (2.412 × 2π) nm ~ (-1) was obtained.Using this composite waveguide polarization interferometer combined with Lorentz-Lorenz effective medium theory, The results showed that the amount of change of refractive index before and after blending water or methanol with liquor had a quasi-linear relationship with the original The dynamic adsorption process of butyrylcholinesterase and the molecular self-assembly process of cytochrome c / sodium polystyrenesulfonate were monitored in real time. Based on the measured phase change and the sensitivity of chip adsorption layer S_ (ad) The protein surface coverage was obtained.