Implementation of electromagnetically induced transparency in a metamaterial controlled with auxiliary waves

TL;DR

This paper demonstrates a metamaterial that achieves electromagnetically induced transparency (EIT) controlled by an auxiliary wave, with experimental validation in the microwave range and tunable transparency features.

Contribution

It introduces a metamaterial design that realizes true EIT controlled by an external wave, with analytical, numerical, and experimental validation.

Findings

EIT effect demonstrated in microwave metamaterial

Transparency width and position tunable by control wave parameters

Observation of asymmetric Fano resonance spectra

Abstract

We propose a metamaterial to realize true electromagnetically induced transparency (EIT), where the incidence of an auxiliary electromagnetic wave called the control wave induces transparency for a probe wave. The analogy to the original EIT effect in an atomic medium is shown through analytical and numerical calculations derived from a circuit model for the metamaterial. We performed experiments to demonstrate the EIT effect of the metamaterial in the microwave region. The width and position of the transparent region can be controlled by the power and frequency of the control wave. We also observed asymmetric transmission spectra unique to the Fano resonance.