Magneto-optical sensor based on the bandgap effect of a hollow-core photonic crystal fiber injected with Fe3O4

Abstract

Abstract A magnetic field sensor, using a hollow-core photonic crystal fiber (HC-PCF), based on the bandgap effect was designed and experimentally demonstrated. The water-based Fe3O4 was infiltrated into the core and the holes of the HC-PCF. The magnetic fluid was prepared with a concentration of 0.6mg/ml. A diode laser with a wavelength 532nm was used as a light source. Two types of HC-PCF were used: HC-1550-19 PCF and HC-800-02 PCF. The sensitivity was tested for a magnetic field that ranges from 0 mT to 24.5 mT. The results demonstrate that the sensitivity of the proposed sensors was 119.95 pm/mT and 151.27 pm/mT for HC-800-02 PCF and HC19-1550 PCF, respectively.