Dissemin is shutting down on January 1st, 2025

Published in

Nature Research, Scientific Reports, 1(9), 2019

DOI: 10.1038/s41598-019-54414-5

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Independently tunable electromagnetically induced transparency effect and dispersion in a multi-band terahertz metamaterial

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractIn this article, we experimentally and numerically investigate a planar terahertz metamaterial (MM) geometry capable of exhibiting independently tunable multi-band electromagnetically induced transparency effect (EIT). The MM structure exhibits multi-band EIT effect due to the strong near field coupling between the bright mode of the cut-wire (CW) and dark modes of pair of asymmetric double C resonators (DCRs). The configuration allows us to independently tune the transparency windows which is challenging task in multiband EIT effect. The independent modulation is achieved by displacing one DCR with respect to the CW, while keeping the other asymmetric DCR fixed. We further examine steep dispersive behavior of the transmission spectra within the transparency windows and analyze slow light properties. A coupled harmonic oscillator based theoretical model is employed to elucidate as well as understand the experimental and numerical observations. The study can be highly significant in the development of multi-band slow light devices, buffers and modulators.