Integration of a near-field coupling device with scanning probes for Nitrogen-Vacancy magnetometry

We present the design and the implementation of a new type of scanning Nitrogen-Vacancy (NV) magnetic imaging probe with an integrated microwave (MW) near-field coupling device for optimized spin manipulation. The microwave coupling loop is directly integrated onto the attachment structure of the scanning probe eliminating the need for external MW delivery solutions. The diamond probe is in close proximity to the coupling loop and its rigid attachment results in a constant MW coupling to the NV center during scanning operation. The device is created through a subtractive manufacturing process followed by the evaporation of a conductive material on its top side to form the MW stripline and loop. This original approach is simple, highly reproducible, and more importantly enables large-scale production as it does not rely on lithography. The characterization and the proof-of-principle scanning NV magnetometry experiment demonstrate that this new devices match the performance of state-of-the-art MW delivery solutions, making it a compelling alternative. This holds particularly true for low-temperature experiments but is also anticipated to generally reduce the technical barriers for the broader adoption of NV magnetometry across a larger research community.