Slow light by hybridized concentric-twisted double split ring resonators and THz application

Here, we demonstrate that hybridizing two double split ring resonator (DSRR) leads to two distinct characteristics dependent upon the rotational direction of the small SRRs. The large SRRs are stationary while the small SRRs rotate equally. Counter-directional rotation of small SRRs results in a red shift of the first resonance and blue shift of the second one, while co-directional twisting of small SRRs brings about splitting of the first resonance into two distinct modes. Therefore, a terahertz plasmon induced transparency (PIT) window with a slow light characteristic is observed in between two split modes.