Abstract
A kind of all-fiber magnetic field sensing structure is proposed and demonstrated here. The sensing element includes a microfiber knot resonator (MKR) cladded with magnetic fluid (MF). The low-index MgF2 slab is adopted as the substrate. The sensitivity increases with the decrease of the MKR ring diameter. The achieved maximum magnetic field sensitivity is 277 pm/mT. The results of this work have the potential to promote the development of magnetically controllable optical devices and the design of ultra-compact cost-effective magnetic field sensors.
Highlights
The micro-nano fiber (MNF) ring resonator has been intensively investigated for its ability to measure various physical parameters, such as magnetic field, temperature, bio-chemical solution, current, salinity, force, electric field, and refractive index (RI) [1,2,3,4,5,6,7,8]
Li et al have demonstrated the all-fiber magnetic field sensor based on microfiber knot resonator (MKR) and magnetic fluid (MF) with a sensitivity of 3 pm/mT [4]
The MgF2 slab with low RI is used as the substrate to support the MKR, which will result in the large evanescent field of the MKR accessing the MF cladding
Summary
The micro-nano fiber (MNF) ring resonator has been intensively investigated for its ability to measure various physical parameters, such as magnetic field, temperature, bio-chemical solution, current, salinity, force, electric field, and refractive index (RI) [1,2,3,4,5,6,7,8]. Compared with the MLR and MCR, MKR is an outstanding MNF ring resonator due to its stable performance and adjustable free spectral range (FSR). Li et al have demonstrated the all-fiber magnetic field sensor based on MKR and magnetic fluid (MF) with a sensitivity of 3 pm/mT [4]. Have designed a magnetically controllable silicon microring with ferrofluid cladding and obtained a magnetic field sensitivity of 1.68 pm/Oe [18]. A fiber-optic magnetic field sensor based on MKR with MF cladding is proposed and experimentally demonstrated. The MgF2 slab with low RI is used as the substrate to support the MKR, which will result in the large evanescent field of the MKR accessing the MF cladding. The proposed MKR sensor has the potential to be utilized in some harsh conditions, such as in narrow gaps and remote monitoring
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