Abstract
It is difficult for nano-scale optical devices to resonate with terahertz waves. By using a nano-discretized metamaterial (NDMM), we converted a gap-localized electromagnetic response into terahertz spectroscopy. A switch of an electromagnetically induced transparency (EIT) analog is acquired by a displacement current in NDMMs and is strongly dependent on the discretization of the nanogap. By controlling the distance of the nanogap, the switch of the EIT can be determined, which, in turn, is linked to the polarization of the electric field. If the electric field is perpendicular to the nanogap, the switch of the EIT can be tuned. While the electric field is parallel to the nanogap, the EIT would exist on all occasions, no matter how the nanogap changes. The proposed NDMMs may ultra-sensitively detect the vibrations of the nano-world using the spectroscopic information of terahertz (THz) response.
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