具有旋转偏置弱测量的超灵敏refractive index传感器
Ultrasensitive refractive index sensor with rotatory biased weak measurement
摘要：
提出了一种改进的弱测量方案--旋转偏置弱测量，以显著提高全反射结构折射率传感器的灵敏度和分辨率。该方法在后选择过程中引入一个附加相位，并在光谱分布中产生一个消光点。有偏的后选择使得耦合强度减小，从而提高了相位灵敏度和折射率灵敏度。在旋光偏置弱测量中，我们实现了比标准弱测量中的1644 nm/RIU更高的13605 nm/RIU的折射率灵敏度。分析了不同灵敏度传感器的性能，发现传感器的最佳折射率分辨率随灵敏度的增加而增加。在这项工作中，我们证明了$4\times10^{-7}$ RIU的全反射结构的最佳折射率分辨率。兔抗小鼠IgG和小鼠IgG结合实验表明，该系统对IgG的浓度在较宽的范围内有较高的响应，检测限为15 ng/mL。本文的工作对其他弱测量光学传感器的优化设计具有一定的参考价值。
英文摘要：
A modified weak measurement scheme, rotatory biased weak measurement, is proposed to significantly improve the sensitivity and resolution of the refractive index sensor on a total reflection structure. This method introduces an additional phase in the post-selected procedure and generates an extinction point in the spectrum distribution. The biased post-selection makes smaller coupling strength available, which leads to an enhancement of phase sensitivity and refractive index sensitivity. In rotatory biased weak measurement, we achieve an enhanced refractive index sensitivity of 13605 nm/RIU compared to 1644 nm/RIU in standard weak measurement. The performance of sensors with different sensitivity is analyzed, and we find the optimal refractive index resolution of sensors increases with sensitivity. In this work, we demonstrate an optimal refractive index resolution of $4\times10^{-7}$ RIU on a total reflection structure. The rabbit anti-mouse IgG and mouse IgG binding reaction experiments demonstrate that our system has a high response to the concentration of IgG in a wide range and the limit of detection is 15 ng/mL. The improvements in this work are helpful to the optimizations of other optical sensors with weak measurement.
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