Plasmonically induced transparent magnetic resonance in a metallic metamaterial composed of asymmetric double bars

TL;DR

This paper demonstrates how asymmetry in a double-bar metallic metamaterial induces a transparent magnetic resonance mode, enabling plasmonic analogue of electromagnetically induced transparency through nonlinear plasmon coupling.

Contribution

It introduces a novel method to induce and control magnetic resonance in asymmetric double-bar structures for electromagnetic waves.

Findings

Magnetic resonance can be induced in asymmetric double bars.

The resonance becomes transparent with minimal absorption.

The phenomenon is explained by nonlinear plasmon coupling.

Abstract

We demonstrate that the trapped magnetic resonance mode can be induced in an asymmetric double-bar structure for electromagnetic waves normally incident onto the double-bar plane, which mode otherwise cannot be excited if the double bars are equal in length. By adjusting the structural geometry, the trapped magnetic resonance becomes transparent with little resonance absorption when it happens in the dipolar resonance regime, a phenomenon so-called plasmonic analogue of electromagnetically induced transparency. Accordingly, the additional magnetic resonance by introducing asymmetry is explained as a result of nonlinear plasmon coupling.