7 June 2013 Quasi-static high-resolution magnetic-field detection based on dielectric optical resonators
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In this paper we present a high resolution magnetic field sensor that is based on the perturbation of the optical modes (whispering gallery mode, WGM) of a spherical dielectric resonator. The optical resonator is side coupled to a tapered single mode optical fiber. One side of the optical fiber is coupled to a distribute feedback diode laser, while the other end is connected to a photodiode. The optical modes of the dielectric cavity are perturbed using a metglas sheet that is in contact with the resonator. When the metglas sheet is exposed to an external magnetic field it elongates perturbing the optical modes of the dielectric cavity. This in turn leads to a shift in the optical resonances. By measuring the induced WGM shift the magnetic field can be measured. Preliminary results show sensor resolution of a few nanoteslas.
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Tindaro Ioppolo, Tindaro Ioppolo, Edoardo Rubino, Edoardo Rubino, "Quasi-static high-resolution magnetic-field detection based on dielectric optical resonators", Proc. SPIE 8709, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XVIII, 87090W (7 June 2013); doi: 10.1117/12.2016315; https://doi.org/10.1117/12.2016315

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