Surface plasmon resonance magnetic field sensor composed of the anti-resonant fiber with high sensitivity and wide detection range

On the heels of the continuous development of electromagnetic and wave technology, higher requirements have been put forward for the detection of environmental magnetic fields. Surface plasmon resonance (SPR), which is highly sensitive to microscopic changes in environmental refractive indexes, has attracted widespread attention in the field of environmental monitoring. Herein, an SPR anti-resonant fiber (ARF) magnetic field sensor is designed and the properties are analyzed by the finite element method. The numerical results indicate that the ARF-SPR sensor can detect magnetic fields in the range of 40–190 Oe with a wavelength sensitivity of up to 1000 pm/Oe and the detection distance is longer than 32.97 m for different H. The sensor has broad application prospects in many areas such as power grid monitoring, communication navigation, biomedicine, and environmental monitoring.