Multiple invisibility regions induced by symmetry breaking in a trimer of subwavelength graphene-coated nanowires

TL;DR

This paper investigates how breaking symmetry in clusters of graphene-coated nanowires can induce multiple invisibility regions in the terahertz range, revealing new ways to control electromagnetic scattering.

Contribution

It demonstrates that symmetry breaking in nanowire clusters can create multiple invisibility regions through dark mode excitation, using Lorenz-Mie and multiple scattering theory.

Findings

Symmetry breaking drastically alters scattering cross-sections.

Dark modes are excited only under TE polarization.

Multiple invisibility regions are induced by design modifications.

Abstract

Electromagnetic response is studied for clusters of subwavelength graphene-coated nanowires illuminated by a linearly polarized plane wave in the terahertz frequency range. The solution of the scattering problem is obtained with the Lorenz-Mie theory and the multiple cylinder scattering formalism. The results show that normalized scattering cross-sections of nanowire clusters can be drastically changed by the symmetry breaking introduced into the cluster's design. This effect is due to excitation of dark modes and is observed only for the incident wave of TE-polarization.