研究目的
To develop a three-axis vector magnetometer using ensembles of nitrogen-vacancy centers in diamond for high-sensitivity magnetic field sensing at ambient temperature, suitable for applications like navigation and exploration.
研究成果
The study successfully demonstrates a high-sensitivity three-axis vector magnetometer using NV centers in diamond, achieving a sensitivity of 5 nT/√Hz. The method is effective for full magnetic field vector reconstruction and has potential for single-chip applications, with future improvements possible through enhanced techniques.
研究不足
The sensitivity is currently ~5 nT/√Hz, which may be improved with better signal-to-noise ratio. The method requires precise control of external magnetic fields and is limited by the properties of the diamond sample.
1：Experimental Design and Method Selection:
The experiment utilizes optically detected magnetic resonance (ODMR) technique with a single-crystal diamond sample containing NV centers. A theoretical model based on C3v symmetry is established for magnetic field calculation.
2：Sample Selection and Data Sources:
A [111] bulk single-crystal diamond (
3：5 x 5 x 1 mm3, Sumitomo, HPHT, 10 ppm) is irradiated and annealed to create NV centers. List of Experimental Equipment and Materials:
Equipment includes a 532 nm continuous-wave green laser (CL532-100-SO), a microwave signal generator (ROHDE & SCHWARZ SMA 100A), a copper loop antenna, a Si amplified detector (THORLABS PDA 100A-EC), and three-axis Helmholtz coils.
4：Experimental Procedures and Operational Workflow:
The diamond is excited with a 532 nm laser, and microwave frequencies are swept to induce spin transitions. Fluorescence is collected and analyzed to obtain ODMR spectra. External magnetic fields are applied using Helmholtz coils.
5：Data Analysis Methods:
Data is fitted with Lorentz functions to determine resonance frequencies, and magnetic field components are calculated using derived equations from the NV atom model.
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