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中文摘要：
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Ta2O5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SRI与Ta2O5梯度薄膜等效厚度Teq的关系,结合实验测定的SRI得出了本工作中所使用Ta2O5梯度薄膜的Teq≈33.021 nm,进一步得出芯片吸附层厚度灵敏度Sad≈（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Sad获得了蛋白质表面覆盖度.
英文摘要：
A tapered thin film of Ta2O5 is sputtered on a single-mode slab glass waveguide to form a composite optical waveguide（COWG） for serving as a prism-coupled integrated optical polarimetric interferometer.The relationship between the refractive-index sensitivity （Sri） of the interferometer and the equivalent thickness（Toq） for the tapered layer of Ta2O5 is theoretically analyzed based on a fourlayer homogeneous waveguide model.A comparison of the measured Sri with the simulated data leads to Teq≈33.021 nm for the COWG used.The sensitivity of the interferometer to thickness of the protein adlayer is determined to be Sad≈（2.412×2n）/nm. The acetic-acid concentration of a commercial Chinese vinegar is investigated,for the first time,by use of the interferometer combined with the Lorentz-Lorenz effective-medium theory.Water and methanol adulterations of a commercial Chinese liquor are detected with the interferometer.The results indicate that the refractive-index change induced by the adulteration is a quasi-linear function of the adulteration amount.Both the dynamic adsorption process of butyrylchohnesterase and the self-assembly process of cytochrome c/PSS multilayer film are monitored in real time with the sensor.The protein surface coverage is obtained from the combination of the measured phase-difference change and the adlayer-thickness sensitivity.
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