Giant Inverse Faraday Effect in Plasmonic Crystal Ring

TL;DR

This paper demonstrates that nanoscale plasmonic rings with periodic width modulation can generate a giant inverse Faraday effect by resonant excitation of plasmon energy bands, leading to amplified magnetic fields.

Contribution

It introduces a novel plasmonic ring design supporting energy bands that produce a resonant giant inverse Faraday effect, enhancing magnetic field generation.

Findings

Large plasmonic rings support energy bands enabling resonant DC currents.

Resonant excitation leads to a giant inverse Faraday effect.

Metamaterials amplify the generated magnetic field significantly.

Abstract

Circularly polarized electromagnetic wave impinging on a conducting ring 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 a 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 metamaterials 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.