Modulating dual-band electromagnetically induced transparency effect via near field coupling in planar terahertz metamaterials

In this article, we numerically and analytically investigate a metamaterial (MM) geometry comprising of a Cut-wire (CW) and a pair of asymmetric double C shaped resonators (DCRs) capable of exhibiting dual-band electromagnetically induced transparency effect. The dual-band EIT effect in the proposed MM results from the strong near field coupling between the bright mode resulting from the CW and pair of dark modes resulting from the two DCRs. The configuration allows us to modulate the transparency windows by displacing one DCR w.r.t the CW and keeping the other fixed. The study could be significant in the development of multi-band slow light devices, buffers and modulators.