Three-dimensional mapping of the magnetic field using near-field scanning microscopy.

Near-field scanning optical microscopy (NSOM) is a fairly mature research area which has allowed the discovery of very exciting phenomena [1]. Interestingly, the light intensity detected while raster scanning the sample surface is mainly the total electric field of the interactions at the close proximity. Although some approaches have been developed the three-dimensional mapping of the electric field at the near-field [2], there is still missing a reliable way to map the components of the magnetic field. In this sense, we present a novel approach for the detection of each component of the three-dimensional magnetic field. We demonstrate that our instrument is able to reproduce well-known theoretical results and opens the possibility to a new way of mapping the full electromagnetic field.



[1] Merlo J. M., et al. Sci Rep 6, 31710 (2016).

[2] Sakurai A., et al. Sci Rep 12, 10348 (2022).