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

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.

4 pages, 4 figures

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• Tunability and Losses of Mid-infrared Plasmonics in Heavily Doped Germanium Thin Films
• Storage of electromagnetic waves in a metamaterial that mimics electromagnetically induced transparency
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• Use of Transmission and Reflection Complex Time Delays to Reveal Scattering Matrix Poles and Zeros: Example of the Ring Graph
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• Superuniversal Statistics of Complex Time-Delays in Non-Hermitian Scattering Systems
• Observation of Fano resonance using a coupled resonator metamaterial composed of meta-atoms arranged by double periodicity
• Controlled opacity in a class of nonlinear dielectric media
• Storage and release of electromagnetic waves using a Fabry-Perot resonator that includes an optically tunable metamirror