Electromagnetically Induced Transparency and Absorption in Metamaterials: The Radiating Two-Oscillator Model and Its Experimental Confirmation

TL;DR

This paper introduces a radiating two-oscillator model for metamaterials that accurately predicts both absorption spectra and scattering properties, validated through experiments, advancing understanding of electromagnetically induced transparency and absorption analogues.

Contribution

The paper develops a comprehensive radiating two-oscillator model that includes external electromagnetic coupling, providing quantitative predictions of scattering and absorption in metamaterials, confirmed experimentally.

Findings

The model accurately predicts absorption spectra and scattering parameters.

Electromagnetically induced absorption occurs under low dissipation and weak coupling.

Experimental results confirm the model's predictions of narrow spectral absorption features.

Abstract

Several classical analogues of electromagnetically induced transparency in metamaterials have been demonstrated. A simple two-resonator model can describe their absorption spectrum qualitatively, but fails to provide information about the scattering properties-e.g., transmission and group delay. Here we develop an alternative model that rigorously includes the coupling of the radiative resonator to the external electromagnetic fields. This radiating two-oscillator model can describe both the absorption spectrum and the scattering parameters quantitatively. The model also predicts metamaterials with a narrow spectral feature in the absorption larger than the background absorption of the radiative element. This classical analogue of electromagnetically induced absorption is shown to occur when both the dissipative loss of the radiative resonator and the coupling strength are small. These predictions are subsequently demonstrated in experiments.