Abstract
A microfiber Mach-Zehnder interferometer (MMZI) integrated with magnetic ionic liquid (MIL) for simultaneous measurement of magnetic field and temperature is proposed and experimentally demonstrated. The MMZI-based sensor is fabricated by splicing a section of microfiber between two segments of single- mode fibers with pre-designed lateral offset, and then encapsulating the sensor structure into a capillary tube filled with MIL. By monitoring the wavelength shifts of two interference dips in the transmission spectrum at the same time, magnetic field and environmental temperature can be simultaneously measured. Experimental results show that the magnetic field and temperature sensitivities reach 25.5 pm/Oe and −4.63 nm/°C for the magnetic field and temperature ranges of 0 Oe to 375 Oe and 30 °C to 42 °C, respectively. In order to resolve the temperature cross sensitivity, a sensor matrix is set up by employing different magnetic field as well as temperature sensitivities of the two selected transmission dips. Our proposed MMZI sensor has several desirable merits such as compact structure, ease of fabrication, and low cost, which make it a good candidate for magnetic field/temperature dual-parameter sensing and related applications.
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