Applied Physics Express

Large-area, tridimensional uniform microwave antenna for quantum sensing based on nitrogen-vacancy centers in diamond

Yulei Chen, Hao Guo, Wangwang Li, Wu Da-Jin, Qiang Zhu, Binbin Zhao, Lei Wang, Yang Zhang, Rui Zhao, Wenyao Liu, Fang‐Fang Du, Jun Tang, Jun Liu

Published Oct 30, 2018• 26 citations

Publisher

Abstract

For quantum sensing based on nitrogen-vacancy (NV) centers in diamond, microwave irradiation with uniform power density and large detection volume is necessary to achieve ultrahigh sensitivity. We demonstrate the fabrication of a double magnetic ring stereoscopic antenna used for the tridimensional uniform control of NV spin ensembles with a 4π mm 2 × 2 mm large volume. Compared with those of traditional microwave antennas (copper wire and single-loop antenna), the sensitivity of the sensor can be improved 4.93 and 9.98 times, and the linearity of the lock-in signal can be increased by 2.04 and 1.11%, respectively. Moreover, the proposed antenna can suppress the thermal noise generated by itself and is amenable to three-dimensional (3D) integration.

DOI: 10.7567/apex.11.123001

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