▎ 摘　　要

NOVELTY - A terahertz grating device based on meta-material graphene, belonging to the technical field. The utility model comprises a substrate layer, an insulating medium layer, the graphene material layer, a source electrode, a drain electrode, an ion gel gate dielectric layer and gate electrode of the top gate. the substrate is horizontally arranged in the lowest layer, the insulating medium layer is horizontally arranged on the upper surface of the substrate, the graphene material layer are set on the middle position of the upper surface of the insulating medium layer, the source electrode, the drain electrode is set at two side of the graphene material layer and covering the graphene super-material edge, the ion gel gate dielectric layer is spin coating above the graphene layer and source and drain electrodes, the top gate gate electrode set on the ion gel gate dielectric layer above the edge position. The utility model compared with the existing grating element, can change the Fermi level of graphene by grid voltage to realize terahertz modulation of waves of different frequencies can be applied in terahertz modulator and terahertz imaging system. and, for the terahertz wave of the same frequency, which can realize the switch of the grating device by adjusting the gate voltage.