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.

摘要

设计了一种基于损耗模式共振(LMR)的光纤磁场传感器。此外，设计了空心偏移结构以提高性能。由于圆对称结构的破坏，传感器具有很强的双折射，导致x偏振和y偏振具有两个独立的共振谷。折射率从 1.358 变为 1.390，获得了 11,483.12 nm/RIU 的高灵敏度。此外，还研究了结构参数对传感器的影响。理论上获得了 893 pm/Gs 和 754 pm/Gs 的磁场灵敏度。证明了 LMR 在磁场测量中的可行性，并为光纤磁场提供了参考。