Dual Mode Interference Magnetic-Field Sensor Based on Hollow Suspended-Core Fiber

A novel magnetic field sensor based on hollow suspended-core fiber (HSCF) has been proposed and fabricated. The magnetic fluid is filled into the microfluidic channel of the HSCF. The core-core mode (LP01 and LP11 modes) interference is excited in the core of the HSCF. The refractive index sensitivity of the interferometer is 331 nm/RIU. The magnetic response of the proposed sensor has been investigated and the results show that a high magnetic field sensitivity of 115.7 pm/Oe is achieved in the magnetic field strength range from 20 to 80 Oe. With the advantages of robustness, high sensitivity, simple interference spectrum and integrated online microfluidic channel, the HSCF interferometer-based magnetic field sensor has promising applications in the fields of aerospace, geological hazards, and navigation.

Automated summary

A novel magnetic field sensor based on hollow suspended-core fiber (HSCF) has been proposed and fabricated. The sensor achieves high sensitivity by filling magnetic fluid into the microfluidic channel of the fiber and utilizing interference principle. With the advantages of robustness, high sensitivity, simple interference spectrum, and integrated microfluidic channel, the sensor has promising applications in various fields.