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Optical spin angular momenta in a confined electromagnetic field exhibitremarkable difference with their free space counterparts, in particular, theoptical transverse spin that is locked with the energy propagating directionlays the foundation for many intriguing physical effects such as unidirectionaltransportation, quantum spin Hall effect, photonic Skyrmion, etc. In order toinvestigate the underlying physics behind the spin-orbit interactions as wellas to develop the optical spin-based applications, it is crucial to uncover thespin texture in a confined field, yet it faces challenge due to their chiraland near-field vectorial features. Here, we propose a scanning imagingtechnique which can map the near-field distributions of the optical spinangular momenta with an achiral dielectric nanosphere. The spin angularmomentum component normal to the interface can be uncovered experimentally byemploying the proposed scanning imaging technique and the three-dimensionalspin vector can be reconstructed theoretically with the experimental results.The experiment is demonstrated on the example of surface plasmon polaritonsexcited by various vector vortex beams under a tight-focusing configuration,where the spin-orbit interaction emerges clearly. The proposed method, whichcan be utilized to reconstruct the photonic Skyrmion and other photonictopological structures, is straightforward and of high precision, and hence itis expected to be valuable for the study of near-field spin optics andtopological photonics.

Mapping the near-field spin angular momenta in the structured surface plasmon polaritons field