Abstract
A temperature-compensated direct current (DC) magnetic field sensor based on a whispering gallery mode (WGM) microcapillary resonator is described in which both temperature-compensation and magnetic field sensing is realized by resonant wavelength difference in two high-order modes. A simulation and experimental results verified that the temperature response of the sensor is significantly reduced using the resonant wavelength difference between two high-order optical modes. In addition, the magnetic field response of resonant wavelength difference between two high-order optical modes was characterized. The results show that the resonant wavelength difference first blue-shifted and subsequently red-shifted as the magnetic field strength increased to provide DC magnetic field sensitivities of −0.03 and 0.01 pm/Oe from 34.79 to 62.56 Oe and 62.56 to 181.012 Oe, respectively. This temperature-compensated DC magnetic field sensor is anticipated to applications for current and rotation angle detection.
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