Laser-sculpted hybrid photonic magnetometer with nanoscale magnetostrictive interaction
Laser-sculpted hybrid photonic magnetometer with nanoscale magnetostrictive interaction
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DOI：
10.1016/j.sna.2017.12.021
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发表时间：
2018
影响因子：
4.6
通讯作者：
T. Allsop;Graham Lee;Changle Wang;R. Neal;K. Kalli;P. Culverhouse;D. Webb
中科院分区：
文献类型：
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作者：
T. Allsop;Graham Lee;Changle Wang;R. Neal;K. Kalli;P. Culverhouse;D. Webb
我们提出了一种新的光子磁传感器，它可以产生在一个给定的静磁场内的传感器的旋转的空间角度的信息，基于光纤平台，具有波长编码的输出和证明的灵敏度为543 pm/mT。这种光纤磁场传感器将传统的紫外激光刻写长周期光栅（LPG）与磁致伸缩材料Terfenol-D相结合，Terfenol-D涂覆并填充邻近并平行于光纤中心轴的50 μm微槽。使用飞秒激光和选择性化学蚀刻产生微槽。在低强度直流磁场（低于0.4 mT）下，静态磁场强度的检测极限为±50 μT，该性能接近地球磁场强度，因此，一旦优化，具有导航应用的潜力。我们的方法解决了传统传感器的主要缺点，即它们对低强度静磁场的灵敏度不足，以及它们无法提供有关方向和幅度的信息。
We present a new photonic magnetic sensor that can yield information on the spatial angle of rotation of the sensor within a given static magnetic field that based upon an optical fiber platform that has a wavelength-encoded output and a demonstrated sensitivity of 543 pm/mT. This optical fiber magnetic field sensor combines a conventional, UV-laser inscribed long period grating (LPG) with a magnetostrictive material Terfenol-D that coats and fills 50-μm micro-slots running adjacent and parallel to the fiber central axis. The micro-slots are produced using a femtosecond laser and selective chemical etching. A detection limit for a static magnetic field strength of ±50 μT is realized in low strength DC magnetic field (below 0.4 mT), this performance approaches the Earth’s magnetic field strength and thus, once optimized, has potential for navigation applications. Our method addresses the major drawback of conventional sensors, namely their inadequate sensitivity to low strength, static magnetic fields and their inability to provide information about the orientation and magnitude.