Toroidal dipole response in a multifold double-ring metamaterial

TL;DR

This paper numerically investigates toroidal dipole responses in multifold double-ring metamaterials, revealing enhanced resonance quality and potential for advanced applications due to design flexibility.

Contribution

It introduces a novel approach to achieve and analyze toroidal responses in multifold double-ring metamaterials, highlighting the impact on resonance quality and application potential.

Findings

Toroidal dipole response enhances resonance quality factor.

Broken electric near-field balance induces toroidal resonance.

Design flexibility allows tailored metamaterial properties.

Abstract

The toroidal response is numerically investigated in a multifold double-ring metamaterials at the antibonding magnetic-dipole mode (i.e., antiparallel magnetic dipoles in one double-ring fold). This intriguing toroidal resonance in metamaterials is considered as a result of the magnetoelectric effect due to the broken balance of the electric near-field environment. We demonstrate that the toroidal dipole response in metamaterials can improve the quality factor of the resonance spectrum. In viewing of the design flexibility on the double-ring geometry, such toroidal metamaterials will offer advantages in application potentials of toroidal dipolar moment.