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Subpicotesla Diamond Magnetometry
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DOI：10.1103/PhysRevX.5.041001.png)
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Nitrogen-vacancy (NV) defect centers in diamond are promising solid-state magnetometers. Single centers allow for high-spatial-resolution field imaging but are limited in their magnetic field sensitivity. Using defect-center ensembles, sensitivity can be scaled with root N when N is the number of defects. In the present work, we use an ensemble of N similar to 10(11) defect centers within an effective sensor volume of 8.5 x 10(-4) mm(3) for sensing at room temperature. By carefully eliminating noise sources and using high-quality diamonds with large NV concentrations, we demonstrate, for such sensors, a sensitivity scaling as 1/root t, where t is the total measurement time. The associated photon-shot-noise-limited magnetic-field sensitivity for ac signals of f = 20 kHz is 0.9 pT/root Hz. For a total measurement time of 100 s, we reach a standard deviation of about 100 fT. Further improvements using decoupling sequences and material optimization could lead to fT/root Hz sensitivity.
Keyword:
MAGNETIC-RESONANCE
ELECTRONIC SPIN
COHERENCE
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15.7
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2.7K
被引数:
3.4W
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引用论文
High-dynamic-range magnetometry with a single nuclear spin in diamond金刚石中具有单个核自旋的高动态范围磁力测定.png)
NATURE NANOTECHNOLOGY
NATURE NANOTECHNOLOGYIF34.9
PREAI
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