D-shaped tilted fiber Bragg grating using magnetic fluid for magnetic field sensor

Abstract In our work, a numerical investigation of a magnetic field sensor based on a D-shaped tilted fiber Bragg grating and magnetic fluid is performed. The sensing probe is constructed by placing the magnetic fluid film on the flat surface of the D-shaped tilted fiber Bragg grating. We investigate the resonance wavelengths of the proposed structure with different tilted angles of grating ranging from 0° to 20°, and analyze the magnetic field sensing characteristics. The simulation results show that the optical fiber sensor exhibits optimal transmission characteristics with a tilted angle of 8°. The wavelength sensitivity of the magnetic field sensor is as high as − 0.18nm/Oe in the range of 30Oe–270Oe, and it demonstrates a linearity up to R 2 = − 0.9998. Such sensor has potential applications in determining magnetic sensing field.