Displacement sensing based on intensity detection by a SNAP-taper coupling system

Yongchao Dong, Penghui Sun, Jian Chen, Xueliang Zeng, Han Wang
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Abstract

A novel highly sensitive displacement sensing method based on the intensity detection of the resonant spectrum, which arises from a fiber-based surface nanoscale axial photonics (SNAP) resonator, is proposed. By means of dissipative and dispersive coupling mechanisms, the changes of the relative position between the SNAP resonator and fiber taper not only bring the shift in a resonant wavelength, but also lead to the variation of the linewidth and extinction ratio of the whispering gallery mode (WGM) in spectrum. Instead of the wavelength shift, we utilize the extinction ratio changes to realize the displacement sensing, which is robust against lasing and microresonator frequency noise in the detecting system. Using the analytical expression of the transmission spectrum, the extinction ratio as a function of the displacement for different axial modes is obtained. It is proved that a large range and high resolution displacement sensor can be achieved by simultaneously tracking the extinction ratio of multiple axial modes. The fiber-based SNAP resonator can be fabricated into a probe-type sensor, making it potential and a powerful tool for many displacement sensing applications such as microstructure measurements in both aerospace and nano-lithography fields.
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基于snap -锥度耦合系统强度检测的位移传感
提出了一种基于光纤表面纳米轴向光子(SNAP)谐振腔共振谱强度检测的高灵敏度位移传感方法。通过耗散和色散耦合机制,SNAP谐振腔与光纤锥度之间相对位置的变化不仅会引起谐振波长的位移,还会导致谱线宽度和窃窃廊模式消光比的变化。利用消光比的变化代替波长位移实现位移传感,对检测系统中的激光和微谐振器频率噪声具有较强的鲁棒性。利用透射谱的解析表达式,得到了不同轴向模式下消光比随位移的函数。实验证明,通过同时跟踪多轴向模态的消光比,可以实现大范围、高分辨率的位移传感器。基于光纤的SNAP谐振器可以制作成探针型传感器,使其成为许多位移传感应用的潜在和强大工具,例如航空航天和纳米光刻领域的微观结构测量。
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