论文标题
抛物线钻石扫描探针用于单个自旋磁场成像
Parabolic diamond scanning probes for single spin magnetic field imaging
论文作者
论文摘要
从钻石中增强固态量子传感器（例如氮呈（NV）中心）的测量信号是传感和成像冷凝物质系统的重要问题。在这里，我们使用截短的抛物线材料来设计钻石扫描探针，该探针可优化单个嵌入式NV中心的光子信号，从而形成了用于纳米级磁场成像的高灵敏度探针。我们开发了一种基于干燥蚀刻的可扩展制造程序，并用可流动的氧化面罩可靠地产生受控的尖端曲率。由此产生的抛物线尖端产生的中位饱和计数率为2.1 $ \ pm $ 0.2 MHz，这是迄今为止扫描探针中单个NVS的最高报告。此外，这些结构跨越完整的NV光致发光光谱，发射到0.46的数值孔中，截断尖端的末端 - 位于抛物线焦点附近，可以进行小的NV-Sample间距和纳米级成像。我们通过成像具有比50 nm的空间分辨率的铁磁条纹成像，我们证明了这些钻石扫描探针的出色特性。我们的结果标志着基于扫描探针的NV传感器的最新技术的测量信号提高了5倍。
Enhancing the measurement signal from solid state quantum sensors such as the nitrogen-vacancy (NV) center in diamond is an important problem for sensing and imaging of condensed matter systems. Here we engineer diamond scanning probes with a truncated parabolic profile that optimizes the photonic signal from single embedded NV centers, forming a high-sensitivity probe for nanoscale magnetic field imaging. We develop a scalable fabrication procedure based on dry etching with a flowable oxide mask to reliably produce a controlled tip curvature. The resulting parabolic tip shape yields a median saturation count rate of 2.1 $\pm$ 0.2 MHz, the highest reported for single NVs in scanning probes to date. Furthermore, the structures operate across the full NV photoluminescence spectrum, emitting into a numerical aperture of 0.46 and the end-facet of the truncated tip, located near the focus of the parabola, allows for small NV-sample spacings and nanoscale imaging. We demonstrate the excellent properties of these diamond scanning probes by imaging ferromagnetic stripes with a spatial resolution better than 50 nm. Our results mark a 5-fold improvement in measurement signal over the state-of-the art in scanning-probe based NV sensors.
