High-sensitivity fiber optic magnetic field sensor based on lossy mode resonance and hollow core-offset structure

Abstract

An optical fiber magnetic field sensor based on lossy mode resonance (LMR) was designed. Furthermore, a hollow core-offset structure was designed to enhance the performance. Due to the destruction of the circular symmetry structure, the sensor has strong birefringence, resulting in x-polarization and y-polarization with two independent resonance valleys. The refractive index changes from 1.358 to 1.390 and a high sensitivity of 11,483.12 nm/RIU was obtained. In addition, the influence of structural parameters on the sensor was investigated. Magnetic field sensitivities of 893 pm/Gs and 754 pm/Gs were obtained theoretically. The feasibility of LMR is demonstrated for magnetic field measurements and a reference is provided for an optical fiber magnetic field.

Keywords:

• Fiber optic sensor
• hollow core-offset structure
• lossy mode resonance (LMR)
• magnetic fluid
• magnetic field measurement

Additional information

Funding

This work was supported by the National Key R&D Program of China by Grant 2019YFC1708704 and 2019YFC1708701, the National Natural Science Foundation of China by Grant 62073068, the Fundamental Research Funds for the Central Universities by Grant N180402023 and N172002001, the Science and Technology Project of Shenyang by Grant 20-206-4-20, the Natural Science Foundation of Liaoning Province by Grant 2020-MS-077, the LiaoNing Revitalization Talents Program under Grant XLYC1907016, and the Liaoning Province Key R & D Plan Guidance Project by Grant 2019JH8/10300109.