Non-Trivial Non-Radiating Excitation as a Mechanism of Resonant Transparency in Toroidal Metamaterials

TL;DR

This paper introduces a novel mechanism for resonant transparency in toroidal metamaterials, utilizing non-radiating charge-current excitations based on toroidal dipoles to achieve narrow, symmetric transmission lines.

Contribution

It presents the first theoretical and experimental demonstration of non-radiating toroidal dipole excitations causing resonant transparency in metamaterials.

Findings

Achieved extremely narrow Lorentzian transmission lines.

Confirmed the existence of non-radiating toroidal dipole excitations.

Demonstrated the mechanism's potential for controlling electromagnetic transparency.

Abstract

We demonstrate theoretically and confirm experimentally a new mechanism of resonant electromagnetic transparency, which yields extremely narrow isolated symmetric Lorentzian lines of full transmission in metamaterials. It exploits the long sought non-trivial non-radiating charge-current excitation based on toroidal dipole moment, predicted to generate waves of gauge-irreducible vector potential in the complete absence of scattered electromagnetic fields.