Classical Analogue of Electromagnetically Induced Transparency with a Metal-Superconductor Hybrid Metamaterial

TitleClassical Analogue of Electromagnetically Induced Transparency with a Metal-Superconductor Hybrid Metamaterial
Publication TypeJournal Article
Year of Publication2011
AuthorsKurter C, Tassin P, Zhang L, Koschny T, Zhuravel AP, Ustinov AV, Anlage SM, Soukoulis CM
Journal TitlePhysical Review Letters
Volume107
Pages043901
Date Published07
ISBN Number0031-9007
Accession NumberWOS:000292822700007
Abstract

Metamaterials are engineered materials composed of small electrical circuits producing novel interactions with electromagnetic waves. Recently, a new class of metamaterials has been created to mimic the behavior of media displaying electromagnetically induced transparency (EIT). Here we introduce a planar EIT metamaterial that creates a very large loss contrast between the dark and radiative resonators by employing a superconducting Nb film in the dark element and a normal-metal Au film in the radiative element. Below the critical temperature of Nb, the resistance contrast opens up a transparency window along with a large enhancement in group delay, enabling a significant slowdown of waves. We further demonstrate precise control of the EIT response through changes in the superfluid density. Such tunable metamaterials may be useful for telecommunication because of their large delay-bandwidth products.

DOI10.1103/PhysRevLett.107.043901