Fano resonances in magnetic metamaterials

TL;DR

This paper investigates Fano resonances in magnetic metamaterials, specifically in split-ring resonator arrays, demonstrating how defect types and configurations influence resonance behavior and tunability.

Contribution

It provides a detailed analysis of Fano resonances in magnetic metamaterials, highlighting the effects of defect types and coupling on resonance occurrence and control.

Findings

Fano resonances occur with specific defect configurations.

Embedded capacitive defects require second-neighbor coupling for Fano resonances.

External inductive defects exhibit tunable Fano resonances based on orientation and distance.

Abstract

We study the scattering of magnetoinductive plane waves by internal (external) capacitive (inductive) defects coupled to a one-dimensional split-ring resonator array. We examine a number of simple defect configurations where Fano resonances occur and study the behavior of the transmission coefficient as a function of the controllable external parameters. We find that for embedded capacitive defects, the addition of a small amount of coupling to second neighbors is necessary for the occurrence of Fano resonance. For external inductive defects, Fano resonances are commonplace, and they can be tuned by changing the relative orientation or distance between the defect and the SSR array.