Abstract
A dual enlarged fiber-tapered magnetic field and temperature detection Mach-Zehnder interferometer which is cladded by magnetic fluid is presented and fabricated. The bi-tapered structure is used to enhance the mode interference intensity. The principle of the sensor is that the refractive index of magnetic fluid is tuned by magnetic field and temperature. Magnetic field and temperature can be detected by monitoring changes in two interference dips with different sensitivity to wavelength. The result shows that the wavelength shift sensitivities for magnetic field and temperature are 264.29 pm/mT and −112 pm/℃, respectively. The sensor has the advantages of easy fabrication, high sensitivity and compact size, which has good potential application in the field of magnetic field and temperature monitoring.
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