▎ 摘　　要

A novel metallodielectric grating coupled with graphene metamaterials (MGCGM) structure is proposed to achieve the tunable plasmon induced transparency (PIT) effect. Two different mechanisms are employed to explain the PIT effect in the reflection spectrum: one is originated from the destructive interference between graphene plasmonic modes and the hybrid mode in the dielectric layer, the other is related to the absorption of the graphene surface plasmons. The simulated results indicate high tunability in the amplitude and the operating wavelength of the PIT effect can be obtained by controlling the Fermi levels of graphene ribbons. Besides, double PITs are demonstrated in this scheme by altering the occupation ratio of the graphene-based ribbon grating. Compared with previous reports, the MGCGM structure is much easier to fabricate and the tunable PIT effect has significant applications in optical modulator, switching, absorber, sensor, slow light, etc.