An microwave-cavity antenna was designed to manipulate the spin state in diamond. It consists of an Ω antenna and a microwave cavity with the thickness of 0.35mm and Q-value of 65. The microwave intensity increased 12 times than that of the Ω antenna. The size of homogeneity area is 25πmm2 and the heterogeneity is less than 2.3%. Hence, more spin structures in large-sized diamonds with high concentration can be homogeneous excited. As applied in the spin-based magnetometer, the sensitivity increased 13 times, and noise reduced to 0.5nT/Hz1/2. It proves a way to develop the high sensitive spin-based sensors.

中文翻译：

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集成微波腔和天线以提高基于金刚石 NV 中心自旋传感器的灵敏度

设计了一种微波腔天线来操纵金刚石的自旋状态。它由一个Ω天线和一个厚度为0.35mm、Q值为65的微波腔组成。微波强度比Ω天线提高了12倍。均质区大小为25πmm2，非均质性小于2.3%。因此，可以均匀激发大尺寸高浓度金刚石中的更多自旋结构。应用于自旋磁力计，灵敏度提高了13倍，噪声降低到0.5nT/Hz1/2。它证明了一种开发高灵敏度自旋传感器的方法。