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The nature of light-matter interaction is governed by the spatial-temporalstructures of a light field and material wavefunctions. The emergence of thelight beam with transverse phase vortex, or equivalently orbital angularmomentum (OAM) has been providing intriguing possibilities to induceunconventional optical transitions beyond the framework of the electric dipoleinteraction. The uniqueness stems from the OAM transfer from light to material,as demonstrated using the bound electron of a single trapped ion. However, manyaspects of the vortex light-matter interaction are still unexplored especiallyin solids with extended electronic states. Here, we unambiguously visualizeddipole-forbidden multipolar excitations in a solid-state electron system; spooflocalized surface plasmon, selectively induced by the terahertz vortex beam.The results obey the selection rules governed by the conservation of the totalangular momentum, which is numerically confirmed by the electromagnetic fieldanalysis. Our results show light's OAM can be efficiently transferred to anelementary excitation in solids.

Selective excitation of multipolar spoof plasmons using orbital angular momentum of light