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 limited by the optical diffraction limit (>200 nm) due to the optical real-space localization and readout of NV centers. Here, we report the wide-field Fourier magnetic imaging technique to improve spatial resolution beyond the optical diffraction limit while maintaining the large field of view. Our method relies on wide-field pulsed magnetic field gradient encoding of NV spins and Fourier transform under pixel-dependent spatial filters. We have improved spatial resolution by a factor of 20 compared to the optical resolution and demonstrated the wide-field super-resolution magnetic imaging of a gradient magnetic field. This technique paves a way for efficient magnetic imaging of large-scale fine structures at the nanoscale.

基于金刚石氮空位（NV）中心的宽场磁成像已被证明在材料和生物科学中的适用性。然而，由于光学实空间定位和 NV 中心的读出，空间分辨率受到光学衍射极限 (>200 nm) 的限制。在这里，我们报告了宽视场傅立叶磁成像技术，可将空间分辨率提高到光学衍射极限之外，同时保持大视场。我们的方法依赖于像素相关空间滤波器下的 NV 自旋和傅里叶变换的宽场脉冲磁场梯度编码。与光学分辨率相比，我们将空间分辨率提高了 20 倍，并演示了梯度磁场的宽场超分辨率磁成像。该技术为纳米级大规模精细结构的高效磁成像铺平了道路。