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

Abstract

The nature of light-matter interaction is governed by the spatial-temporal structures of a light field and material wavefunctions. The emergence of the light beam with transverse phase vortex, or equivalently orbital angular momentum (OAM) has been providing intriguing possibilities to induce unconventional optical transitions beyond the framework of the electric dipole interaction. The uniqueness stems from the OAM transfer from light to material, as demonstrated using the bound electron of a single trapped ion. However, many aspects of the vortex light-matter interaction are still unexplored especially in solids with extended electronic states. Here, we unambiguously visualized dipole-forbidden multipolar excitations in a solid-state electron system; spoof localized surface plasmon, selectively induced by the terahertz vortex beam. The results obey the selection rules governed by the conservation of the total angular momentum, which is numerically confirmed by the electromagnetic field analysis. Our results show light's OAM can be efficiently transferred to an elementary excitation in solids.

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• Imprinting spiral Higgs waves onto superconductors with vortex beams
• Designing rotational motion of charges on plasmonic nanostructures excited by circularly polarized light
• Extreme-ultraviolet structured beams via high harmonic generation
• On the transfer of optical orbital angular momentum to matter
• Conservation law for angular momentum based on optical field derivatives: Analysis of optical spin-orbit conversion
• Optical-vortex-pulse induced nonequilibrium spin textures in spin-orbit coupled electrons