Subpicotesla Diamond Magnetometry
Subpicotesla Diamond Magnetometry
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DOI：
10.1103/physrevx.5.041001
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发表时间：
2015-10-05
影响因子：
12.5
通讯作者：
Wrachtrup, Joerg
中科院分区：
文献类型：
--
作者：
Wolf, Thomas;Neumann, Philipp;Wrachtrup, Joerg
金刚石中的氮空位（NV）缺陷中心是一种很有前途的固体磁强计。单中心允许高空间分辨率场成像，但其磁场灵敏度有限。使用缺陷中心系综，当N是缺陷的数量时，灵敏度可以用根N来缩放。在目前的工作中，我们使用了一个类似于10（11）个缺陷中心在8.5 × 10（-4）mm（3）的有效传感器体积内的N在室温下进行传感的合奏。通过仔细消除噪声源，并使用高品质的钻石与大NV浓度，我们证明，对于这样的传感器，灵敏度缩放为1/根t，其中t是总测量时间。对于f = 20 kHz的交流信号，相关的光子散粒噪声限制磁场灵敏度为0.9 pT/root Hz。对于100 s的总测量时间，我们达到约100 fT的标准偏差。使用去耦序列和材料优化的进一步改进可以导致fT/根Hz灵敏度。
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.