Mechanism of electromagnetically induced transparency like phenomena with metamaterials in terahertz region

We experimentally and numerically investigate spectral response that resembles electromagnetically induced transparency (EIT) phenomenon by using two planar metamaterials. The one of them consists of a cut wire (CW) with low quality factor and two SRRs with high quality factor, the other consists of a split ring resonator (SRR) with high quality factor located within a closed ring resonator (CRR) with low quality factor. By using FDTD simulation, we investigate the detailed mechanism of EIT-like phenomenon that occurs in the coupled system between two bright resonant modes.