▎ 摘　　要

We propose to achieve dual plasmon-induced transparency effects through the couplings between a bright mode and two dark modes in a metamaterial system with two graphene sheets separated by periodic graphene gratings. We find that both the number and the positions of the transparent windows can be modulated by tuning the Fermi energy and coupling distance between graphene resonators, which allows us to design a high-efficiency switch with an on/off state modulation amplitude of 71.1%. A three-particle model-based theoretical model is applied to explain the simulated results and excellent agreement between them is found.