Broadband microwave antenna for uniform manipulation of millimeter-scale volumes of diamond quantum sensors

At a Glance

Metadata	Details
Publication Date	2022-12-08
Journal	Journal of Applied Physics
Authors	Yukitoshi Takemura, Kazushi Hayashi, Y. Yoshii, M. Saito, Shinobu Onoda
Institutions	National Institute for Materials Science, National Institutes for Quantum Science and Technology
Citations	3

Abstract

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 9.2% 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.

Tech Support

Original Source

DOI: https://doi.org/10.1063/5.0128406

References

2013 - Solid-state electronic spin coherence time approaching one second [Crossref]