Electric coupling to the magnetic resonance of split ring resonators

TL;DR

This paper investigates how electric fields can excite magnetic resonances in split ring resonators, revealing unexpected coupling effects through theoretical and experimental analysis of transmission spectra.

Contribution

It demonstrates electric coupling to magnetic resonance in SRRs under specific polarization and propagation conditions, supported by a simple analytic model.

Findings

Electric field couples to magnetic resonance when propagating perpendicular to SRR plane.

Transmission spectrum shows a dip indicating this coupling.

Theoretical and experimental results agree on the coupling phenomenon.

Abstract

We study both theoretically and experimentally the transmission properties of a lattice of split ring resonators (SRRs) for different electromagnetic (EM) field polarizations and propagation directions. We find unexpectedly that the incident electric field E couples to the magnetic resonance of the SRR when the EM waves propagate perpendicular to the SRR plane and the incident E is parallel to the gap-bearing sides of the SRR. This is manifested by a dip in the transmission spectrum. A simple analytic model is introduced to explain this interesting behavior.