Magnetic fluid infiltrated dual core photonic crystal fiber based highly sensitive magnetic field sensor

A very high sensitive magnetic field sensor based on a square lattice dual core photonic crystal fiber (DCPCF) is proposed in this article. The fiber contains two big magnetic fluid (Fe3O4) infiltrated holes around the central region and they are forming two separate waveguide with mode coupling. Mode coupling between these two cores is theoretically studied under influence of different magnetic field strength as well as with changing structural parameters. In the further stage a simple magnetic field sensing system is proposed and its sensing performance is investigated considering manufacturing variation possibilities. Numerical simulation result shows that highest sensitivity of 799.07 pm/Oe can be achieved with probe size of fraction of centimetre. This sensing probe can be used in manufacturing high sensitive portable devices including health monitoring instruments.