Versatile Quadrature Antenna for Precise Control of Large Electron Spin Ensembles in Diamond
At a Glance
Section titled âAt a Glanceâ| Metadata | Details |
|---|---|
| Publication Date | 2024-11-29 |
| Journal | Advanced Quantum Technologies |
| Authors | RubĂ©n Pellicer-Guridi, Koen Custers, Joseba SolozabalâAldalur, A. Brodolin, Jason Francis |
| Institutions | Material Physics Center, Ikerbasque |
Abstract
Section titled âAbstractâAbstract An easily reproducible inexpensive microwave antenna that can generate a strong and homogeneous magnetic field of arbitrary polarization is presented, which enables fast and coherent control of electron spins over a large volume. Unlike preceding works, a resonant antenna with ample optical access and which maintains its resonant behavior regardless of the proximity of other experimental hardware components is presented. This robustness is crucial as it enables using microscope objectives with short working distances to perform wideâfield imaging/sensing with bulk diamonds. The antenna generates a magnetic field strength of 22.3 A for 1 W total driving power, which doubles the power efficiency compared with previously reported patch antenna designs. The magnetic field homogeneity in a volume of , and is within 3%, 8% and 14%, respectively. The antenna can be driven offâresonance without affecting the ellipticity and inhomogeneity of the field, and has a fullâwidthâatâhalfâmaximum bandwidth of 200 MHz. Its resonant frequency can be tuned over a 400 MHz range via varactors. The PCB files are provided openâsource. This work facilitates a robust and versatile piece of instrumentation, being particularly appealing for applications such as high sensitivity magnetometry and wideâfield imaging/sensing with nitrogenâvacancy centers.