研究目的
To demonstrate a sensitive magnetometer based on WGM resonators using a magnetically induced MF film coated on the surface of a microsphere to detect external magnetic fields.
研究成果
A sensitive magnetometer based on WGM resonators is demonstrated, achieving a sensitivity of 5.036pm/mT in a spherical WGM resonator with a Q-factor of 0.78×105.
研究不足
The study is limited by the sensitivity and Q-factor achievable with the current setup, and the direction of the magnetic field must be carefully controlled to eliminate susceptibility of MF to applied magnetic field.
1：Experimental Design and Method Selection:
The study employs an optical fiber taper-microsphere coupling method to couple evanescent light into and out of the microsphere resonators.
2：Sample Selection and Data Sources:
A diameter of 42 um silica sphere and a waist diameter of 2 um fiber taper are manufactured.
3：List of Experimental Equipment and Materials:
Includes a tunable laser, fiber polarization controller, optical spectrum analyzer, and an electromagnetic coil.
4：Experimental Procedures and Operational Workflow:
Light from a 1550nm tunable laser is injected to the microsphere through a tapered fiber coupling, and the resonance shift is monitored.
5：Data Analysis Methods:
The resonance shift is analyzed using Lorentz fitting to calculate the Q-factor of the microsphere.
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