Abstract
In 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.
Highlights
In 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)
Quasi dark modes can couple with the incident electric field, as compared to the bright mode it has weaker confinement
We experimentally and numerically examine a MM structure comprising a CW surrounded by a pair of asymmetric double C resonators (DCRs) that exhibits multi-band EIT effect in the terahertz frequency regime
Summary
In order to understand the evolution of the multi-band EIT effect in the MM structure, we have examined the terahertz transmission response as well as induced electric field profiles in the CW, two DCRs and combined MM structure (see Fig. 2). In order to further understand and validate numerical and experimental findings on multi-band transparency effect and independent modulation of transparency window, we employ a theoretical model based on coupled harmonic oscillator systems. As evident from the results, coupling coefficients are found to vary corresponding to their respective modulating window which has been quantitatively discussed
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