▎ 摘　　要

NOVELTY - The graphene optical device comprises a semiconductor upper layer (110a) and a semiconductor lower layer (110b). A graphene capacitor (120) is arranged between the semiconductor upper layer and the semiconductor lower layer. The graphene capacitor is arranged between first graphene (210) and second graphene (220). The first graphene and the second graphene are arranged to partially overlap when viewed from the upper semiconductor layer to the lower semiconductor layer. The first graphene and the second graphene overlap in a central portion having high optical density, and do not overlap in an outer portion disposed on a side surface of the central portion. USE - Graphene optical device used for transmission, reception, and modulation. ADVANTAGE - The material having optical modulation performance, is coupled to an optical waveguide, and the device size and driving voltage are reduced. The graphene optical device has low cost, wide wavelength range, and high-speed operation. Although there is no significant change in the modulation depth, the capacitance affecting the modulation rate is greatly reduced and increases energy efficiency by reducing capacitance. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a graphene optical device. Semiconductor upper layer (110a) Semiconductor lower layer (110b) Graphene capacitor (120) First electrode (131) Second electrode (132) First graphene (210) Second graphene (220)