Wide-Field Dynamic Magnetic Microscopy Using Double-Double Quantum Driving of a Diamond Defect Ensemble

Wide-field magnetometry can be realized by imaging the optically-detected magnetic resonance of diamond nitrogen vacancy (NV) center ensembles. However, NV ensemble inhomogeneities significantly limit magnetic-field sensitivity these measurements. We demonstrate a double-double quantum (DDQ) driving technique to facilitate wide-field dynamic fields at micron scale. DDQ employs four-tone radio frequency pulses suppress inhomogeneity-induced variations resonant response. As proof-of-principle, we use image dc field produced individual magnetic-nanoparticles tethered single DNA molecules sensor surface. This demonstrates efficacy system in high-frame-rate microscopy, as well single-molecule biophysics applications.