Quasi-dark Mode in a Metamaterial for Analogous Electromagnetically-induced Transparency

TL;DR

This paper demonstrates a metamaterial design that exhibits an electromagnetically-induced transparency-like effect by coupling a bright mode with a quasi-dark mode, enabling more flexible device implementations.

Contribution

It introduces a novel metamaterial structure with a quasi-dark mode that simplifies achieving EIT-like effects compared to traditional designs.

Findings

The SRR acts as a quasi-dark mode due to weak excitation.

Coupling between CW and SRR produces EIT-like transparency.

Design relaxes conditions for EIT device realization.

Abstract

We study a planar metamaterial supporting electromagnetically-induced transparency (EIT)-like effect by exploiting the coupling between bright and quasi-dark eigenmodes. The specific design of such a metamaterial consists of a cut-wire (CW) and a single-gap split-ring resonator (SRR). From the numerical and the analytical results we demonstrate that the response of SRR, which is weakly excited by external electric field, is mitigated to be a quasi-dark eigenmode in the presence of strongly radiative CW. This result suggests more relaxed conditions for the realization of devices utilizing the EIT-like effects in metamaterial, and thereby widens the possibilities for many different structural implementations.