Graphene nanosheet pair array

A graphene nanosheet pair array comprises an upper layer of graphene nanosheets, a lower layer of graphene nanosheets and a quartz substrate. The quartz substrate is arranged between the upper layer of graphene nanosheets and the lower layer of graphene nanosheets, the upper layer of graphene nanosheets and the lower layer of graphene nanosheets comprise multiple graphene nanosheets uniformly distributed at the top and the bottom of the quartz substrate, and the quartz substrate is used for fixing and separating the upper layer of graphene nanosheets and the lower layer of graphene nanosheets. A multifunctional optical device based on the graphene nanosheet pair array structure is realized and can serve as an active plasma band elimination filter with the resonant wavelength tilt of transmissivity lower than 0.2% or a high-sensitivity refractive index sensor with the sensitivity reaching up to 4879 nm/RIU or a two-channel optical circuit switch with the modulation depths of the resonant wavelength tilt being