▎ 摘　　要

NOVELTY - The modulator has a graphene thin film layer (130) arranged on a substrate (110). A black phosphorus thin film layer (140) is formed on the graphene thin film layer. The graphene thin film layers and the black phosphorus thin film layers form a van der Hua heterojunction. The graphene thin film layer is provided with doped ions for adjusting conductivity of the graphene thin film layer, where the substrate is made of a silicon substrate, a silicon carbide substrate and a gallium nitride substrate. USE - Surface plasmon optical modulator for use in a photoelectric device (claimed) for high-speed and long-distance optical communication applications. ADVANTAGE - The virtual portion of the conductivity of the graphene thin film layer is adjusted to positive number, so as to excite surface plasmon phenomenon on the interface between the graphene thin film layer and the black phosphorus thin film layers to change incident light polarization direction of the black phosphorus thin film layers, and change dispersion relation of a heterogeneous structure formed by the graphene thin film layers and the black phosphorus thin film layers to realize adjustment of light intensity, thus realizing adjustable polarization angle and working wavelength. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a photoelectric device. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a surface plasmon optical modulator for use in a photoelectric device. Substrate (110) Insulating layer (120) Graphene thin film layer (130) Black phosphorus thin film layer (140)