Atomically thin spherical shell-shaped superscatterers based on Bohr model

TL;DR

This paper proposes atomically thin spherical shell-shaped superscatterers using graphene monolayers, achieving significant scattering enhancement through TM plasmon resonance explained by the Bohr model, with limitations for TE modes.

Contribution

It introduces a novel design of superscatterers based on graphene shells and explains the resonance mechanism using the Bohr model, highlighting the difference between TM and TE modes.

Findings

TM resonance enhances scattering by five orders of magnitude.

Superscattering is explained via the Bohr model.

TE mode resonance is difficult due to poor field confinement.

Abstract

Graphene monolayers can be used for atomically thin three-dimensional shell-shaped superscatterer designs. Due to the excitation of the first-order resonance of transverse magnetic (TM) graphene plasmons, the scattering cross section of the bare subwavelength dielectric particle is enhanced significantly by five orders of magnitude. The superscattering phenomenon can be intuitively understood and interpreted with Bohr model. Besides, based on the analysis of Bohr model, it is shown that contrary to the TM case, superscattering is hard to occur by exciting the resonance of transverse electric (TE) graphene plasmons due to their poor field confinements.