Broadband microwave antenna for uniform manipulation of millimeter-scale volumes of diamond quantum sensors
Broadband microwave antenna for uniform manipulation of millimeter-scale volumes of diamond quantum sensors
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DOI：
10.1063/5.0128406
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发表时间：
2022-12
影响因子：
3.2
通讯作者：
Y. Takemura;K. Hayashi;Y. Yoshii;M. Saito;S. Onoda;H. Abe;T. Ohshima;T. Taniguchi;M. Fujiwara;H. Morishita;I. Ohki;N. Mizuochi
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文献类型：
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作者：
Y. Takemura;K. Hayashi;Y. Yoshii;M. Saito;S. Onoda;H. Abe;T. Ohshima;T. Taniguchi;M. Fujiwara;H. Morishita;I. Ohki;N. Mizuochi
基于金刚石中氮空位（NV）中心的量子传感器有望展示出广泛的应用。对于具有NV中心系综的高灵敏度量子传感器，需要大体积的NV中心的电子自旋的均匀操纵。此外，在有限静磁场下的矢量磁强计和测量中，需要一个宽的微波频率带宽来操纵NV中心的电子自旋。在这里，我们展示了一种宽带微波天线，用于均匀操纵毫米级体积的金刚石量子传感器。仿真结果表明，由于集肤效应，电流分布在单个铜板环形线圈的两端。环形线圈的作用类似于亥姆霍兹线圈，其实现微波磁场（B1）在z方向上的均匀性。由于其大体积，板结构具有比亥姆霍兹线圈更高的机械稳定性、耐久性和更大的热容量。该天线实现了比以前报道的天线更高的性能，最大B1为4.5 G，宽带宽为287 ± 6 MHz，在3.1 mm3圆柱体体积上的峰峰值变化为[公式：见正文]。这些性能表明，所提出的天线适用于操纵高灵敏度量子传感器的固态自旋系综。
Quantum sensors based on nitrogen-vacancy (NV) centers in diamond are expected to demonstrate a wide variety of applications. For high-sensitivity quantum sensors with NV center ensembles, uniform manipulation of the electron spins of the NV centers in large volumes is required. In addition, a broad microwave frequency bandwidth for manipulating the NV centers' electron spin is necessary for vector magnetometry and measurement under a finite static magnetic field. Here, we demonstrate a broadband microwave antenna for uniform manipulation of millimeter-scale volumes of diamond quantum sensors. The simulation shows that the current is distributed at both edges of the loop coil of a single copper plate due to the skin effect. The loop coil acts like a Helmholtz coil, which realizes uniformity in the z-direction of the microwave magnetic field ( B1). The plate structure has a higher mechanical stability, durability, and a larger heat capacity than the Helmholtz coil, due to its large volume. The antenna achieves a higher performance than previously reported antennae, with a maximal B1 of 4.5 G, a broad bandwidth of 287 ± 6 MHz, and a peak-to-peak variation of [Formula: see text] over a 3.1 mm3 cylinder volume. These performances show that the presented antenna is suitable for manipulating solid-state spin ensembles for high-sensitivity quantum sensors.