Magnetic dipole moments in single and coupled split-ring resonators

TL;DR

This paper investigates how magnetic dipoles influence the scattering properties of single and coupled split-ring resonators, highlighting their directional effects and significance in the resonators' linear response.

Contribution

It provides a numerical analysis of magnetic dipoles' roles in scattering and reveals their directional influence and importance in coupled resonator responses.

Findings

Magnetic dipoles significantly affect scattering cross sections.

Magnetic dipoles aligned with the incident magnetic field are particularly influential.

High-order multipoles also play a role in the linear response.

Abstract

We examine the role of magnetic dipoles in single and coupled pairs of metallic split-ring resonators by numerically computing their magnitude and examining their relative contributions to the scattering cross section. We demonstrate that magnetic dipoles can strongly influence the scattering cross section along particular directions. It is also found that the magnetic dipole parallel to the incident magnetic field and/or high-order multipoles may play a significant role in the linear response of coupled split-ring resonators.