We present a three-dimensional microwave antenna design, which can provide strong and spatially homogeneous GHz microwaves for efficient driving of nitrogen-vacancy (NV) ensembles in a diamond. From numerical simulation, we find the field strength to be as large as ~ 21 G at 2.87 GHz equivalent to an ~ 60 MHz Rabi frequency. In addition, the field remains uniform over an ~ mm3 volume of the diamond. We determine the antenna parameters and configurations based on quantitative analyses of the simulation results in terms of the loop radius, the number of coil, the dielectric materials and the coil configurations of the solenoid and Helmholtz coil. The antenna design studied in this research can be used in various sensing applications based on the NV ensemble, where a strong and uniform microwave drive is necessary.
Bibliographical noteFunding Information:
This work is supported by the Defense Agency for Technology and Quality (DTaQ), Korea and by the MSIT (Ministry of Science and ICT), Korea, under the ITRC (Information Technology Research Center) support program (IITP-2020-0-01606) supervised by the IITP (Institute of Information & Communications Technology Planning & Evaluation).
© 2021, The Korean Physical Society.
- Diamond NV ensemble
- Microwave antenna
- Quantum sensing
ASJC Scopus subject areas
- General Physics and Astronomy