Simultaneous Measurement of Temperature and Magnetic Field Based on Ionic-Liquid-Infiltrated Side-Hole Fibers

A dual-parameter fiber-optic sensor based on magnetic ionic liquids (MILs) functionalized side-hole fibers (SHFs) has been proposed and experimentally demonstrated for simultaneous measurement of temperature and magnetic field intensity. Multiple transmission dips are present in the transmission spectrum due to resonance coupling between the fundamental core mode and high-order modes in the MIL inclusion. The wavelength shifts of these resonance dips are highly sensitive to the environmental temperature and applied magnetic field intensity, providing an ideal sensing platform for simultaneous measurement of the above two physical parameters. Experimental results indicate that our proposed sensor exhibits temperature and magnetic field sensitivities up to −3.466 nm/°C and −0.0303 nm/Oe for the measurement ranges of 25 °C to 100 °C and 20 Oe to 200 Oe, respectively. The MILs-infiltrated SHFs sensor paves new way toward developing photonic devices for temperature/magnetic field dual-parameter sensing and high-precision wavelength-tuning based on functional materials.