Wide-field Fourier magnetic imaging with electron spins in diamond

Abstract

Abstract Wide-field magnetic imaging based on nitrogen-vacancy (NV) centers in diamond has been shown the applicability in material and biological science. However, the spatial resolution is set to optical diffraction limit (>200 nm) because of the optical real-space localization and readout of NV centers. Here, we report the wide-field Fourier magnetic imaging technique to improve the spatial resolution to beyond the optical diffraction limit while the large field of view is kept. Our method relies on the widefield pulsed magnetic field gradient encoding to the NV spins and the Fourier transform under pixel related spatial filters. We show the improvement of spatial resolution of up to 20 times compared to the optical resolution and demonstrated the wide-field super-resolution magnetic imaging of a gradient magnetic field. This technique paves a way in efficient magnetic imaging for nanoscale fine structures with large dimension.