Background: Graphene

a two-dimensional layer of carbon atoms forming a honeycomb crystal lattice

has attracted much attention for its extraordinary car?rier transport properties. The unique electronic structure of graphene gives rise to massless charge carriers and ballistic transport on a submicron scale at room temperature. Purpose: The tunable electrical properties realized by raising or lowering the Fermi level

allow excellent tunability of electromagnetic structures made of this material. Methods: We used terahertz time-domain analysis of the composite structure. Results: Here we demonstrate a significant amplitude modulation of THz waves with gated graphene by using extraordinary transmission through the graphene layer placed right above N-silicon substrate in the blue-violet laser of continuous irradiation. However

the reflection modulation of THz waves is weak monotonic. Conclusion: We employ the carrier transport properties of the graphene and the transport properties of the Schottky junction to analyze a graphene-silicon hybrid structure’s strange transmission reasonably.Cited