Giant inverse Faraday effect in a plasmonic crystal ring

Circularly polarized electromagnetic wave impinging on a conducting ring with a two-dimensional electron channel generates a circulating DC plasmonic current resulting in an inverse Faraday effect in nanorings. We show that a large ring with periodically modulated width on a nanoscale, smaller or comparable with the plasmonic mean free path, supports plasmon energy bands. When circularly polarized radiation impinges on such a plasmonic ring, it produces resonant DC plasmonic current on a macro scale resulting in a giant inverse Faraday effect. The systems comprised of the concentric variable-width rings (plasmonic disks) and stacked plasmonic disks (plasmonic solenoids) amplify the generated constant magnetic field by orders of magnitude. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

Circularly polarized electromagnetic waves generate a circulating DC plasmonic current on a conducting ring, leading to an inverse Faraday effect in nanorings. By modulating the width of the ring, a large-scale inverse Faraday effect can be achieved.