Abstract
Nanooptics Orbital angular momentum (OAM) of light can be confined to metal surfaces in the form of plasmonic vortices, where nanoscale twisted light oscillates together with the free electrons in metal. Spektor et al. introduced the reflection from structural boundaries as a new degree of freedom to generate and control this surface-confined angular momentum. They designed vortex cavities with chiral boundaries, in which subsequent reflections increased the vortex OAM by multiples of the chiral cavity order. They then tracked the spatiotemporal dynamics of the plasmon pulse trains within the vortex cavities using time-resolved photoemission electron microscopy with sub-femtosecond resolution. These results may have applications in quantum initialization schemes and potentially achieve vortex lattice cavities with dynamically evolving topology. Sci.Adv. 10.1126/sciadv.abg5571 (2021).
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