论文标题
纤维耦合的钻石磁力测定法，带有30 pt/$ \ sqrt {\ textrm {hz}} $敏感性
Fiber-coupled Diamond Magnetometry with an Unshielded 30 pT/$\sqrt{\textrm{Hz}}$ Sensitivity
论文作者
论文摘要
钻石中氮空位中心（NVC）的集合可用于敏感磁力测定法。在这项工作中，我们提出了一个纤维耦合的NVC磁力计，其灵敏度为（30 $ \ pm $ 10）pt/$ \ sqrt {\ textrm {hz}} $在A（10-500）-Hz频率范围内。通过相对较高的绿色到红色光子转换效率，[100]偏置场对齐，微波炉和锁定放大器（LIA）参数优化以及平衡的超细激发方案的使用，可以实现这种灵敏度。此外，使用低压$^{12} \ textrm {C} $ Diamonds，将碳化硅（SIC）散布器用于微波炉递送，其中一种放置在第二磁性不稳定的荧光收集传感器头中，以进行共同模式噪声。磁力计能够检测到来自2 m外的真空泵等源的信号，具有一些方向依赖性，但没有完整的死区，表明其在遥感应用中的使用潜力。
Ensembles of nitrogen vacancy centres (NVCs) in diamond can be employed for sensitive magnetometry. In this work we present a fiber-coupled NVC magnetometer with an unshielded sensitivity of (30 $\pm$ 10) pT/$\sqrt{\textrm{Hz}}$ in a (10 - 500)-Hz frequency range. This sensitivity is enabled by a relatively high green-to-red photon conversion efficiency, the use of a [100] bias field alignment, microwave and lock-in amplifier (LIA) parameter optimisation, as well as a balanced hyperfine excitation scheme. Furthermore, a silicon carbide (SiC) heat spreader is used for microwave delivery, alongside low-strain $^{12}\textrm{C}$ diamonds, one of which is placed in a second magnetically insensitive fluorescence collecting sensor head for common-mode noise cancellation. The magnetometer is capable of detecting signals from sources such as a vacuum pump up to 2 m away, with some orientation dependence but no complete dead zones, demonstrating its potential for use in remote sensing applications.
