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首页> 外文会议>Conference on Optical and Quantum Sensing and Precision Metrology >Wide-field AC magnetic field imaging using continuous-wave optically detected magnetic resonance of nitrogen-vacancy centers in diamond
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Wide-field AC magnetic field imaging using continuous-wave optically detected magnetic resonance of nitrogen-vacancy centers in diamond

机译：使用连续波的宽场交流磁场成像在钻石中使用连续波光学检测的氮气空位中心的磁共振

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Nitrogen-vacancy (NV) center in diamond is a promising candidate for a highly-sensitive magnetometer with high spatial resolution at room temperature. Conventional magnctometry typically uses scanning confocal microscopic techniques that require long measurement times to achieve a wide observation area and/or high sensitivity. Wide-field imaging techniques using CCD/CMOS camera has the advantage of enabling a wide field of view and rapid acquisition time by simultaneously detecting signals from NV centers in a large number of pixels of the camera. Continuous-wave optically detected magnetic resonance (CW-ODMR) is suitable for wide-field imaging of magnetic field using cameras with slow response time. However, only DC or low-frequency (up to kHz) AC magnetic field can be detected using CW-ODMR techniques. Recently, our group has developed a new measurement protocol using CW-ODMR to detect high-frequency (MHz range) AC magnetic fields using the zero-field splitting of the spin triplet states of NV centers. This technique is compatible with CCD-based imaging techniques. In this study, we implement our CW-ODMR protocol and measure the spatial-distribution of high-frequency AC magnetic fields with a wide-field imaging setup. Using our home-built wide-field imaging setup, a bulk diamond sample was mounted on a microwave antenna and a target AC magnetic field was applied by a copper wire placed on the sample surface. By comparing the CW-ODMR spectra with and without applied field, it is demonstrated that the AC magnetic field can be detected and estimated according to the protocol. Detection was performed both in wide-field view and windows of few pixels while averaging the signal over many pixels enabled rapid measurements.
机译：金刚石中的氮空位（NV）中心是高度敏感磁力计的有希望的候选者，室温下具有高空间分辨率。常规的自切换法通常使用需要长测量时间的扫描共聚焦微观技术来实现广泛的观察区域和/或高灵敏度。使用CCD / CMOS相机的宽场成像技术具有通过在相机的大量像素中检测来自NV中心的信号的宽视野和快速采集时间的优点。连续波光学检测的磁共振（CW-ODMR）适用于使用具有慢响应时间的摄像机的磁场的宽场成像。然而，只有使用CW-ODMR技术可以检测到DC或低频（最高kHz）交流磁场。最近，我们的小组使用CW-ODMR开发了一种新的测量协议，可以使用NV中心的旋转三重态态的零场分裂来检测高频（MHz范围）交流磁场。该技术与基于CCD的成像技术兼容。在本研究中，我们实施了我们的CW-ODMR协议，并测量具有宽场成像设置的高频交流磁场的空间分布。使用本土宽野成像设置，将散装金刚石样品安装在微波天线上，并通过放置在样品表面上的铜线施加目标交流磁场。通过将CW-ODMR光谱与施加和无施加的场比进行比较，证明可以根据协议检测和估计AC磁场。在宽场视图和几个像素的窗口中进行检测，同时平均信号在许多像素上实现了快速测量。

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