Microscopic Magnetic Field Imaging with Hot Atoms

In the recent years, atomic sensors have demonstrated superior performance in magnetic field sensing compared to other technologies [1]. While atomic vapour cells have been integrated into compact systems, such as bio- imaging, the spatial resolution remains limited by the size of the sensors [2]. Here, we propose combining single- pixel imaging (SPI) technique with an atomic vapour cell to achieve microscopic-scale imaging for magnetic field sensing. The SPI technique involves projecting pattern of light onto a sample while monitoring the intensity [3]. The magnetic field is then estimated using the Faraday effect, where an incident linear polarised beam rotates in the presence of a magnetic field as the probe beam propagates through the atomic vapour cell.