▎ 摘　　要

NOVELTY - The device has a period-doubling (PD) photonic crystal whose symmetrical center is embedded with a graphene single layer, where thickness of a first uniform dielectric thin sheet and a second uniform dielectric thin sheet is one fourth of optical wavelength. A composite structure is provided with an optical component. A graphene is located at a position of strongest optical sub-area electric field corresponding to a central defect mode, where nonlinear effect of graphene is enhanced to realize low-threshold optical dual-steady state, and the optical bistable is applied to the optical logic device, and upper and lower thresholds of the optical bistable correspond to the decision thresholds of the optical logic 1 and logic 0. USE - PD photonic crystal and graphene composite structure-based optical logic device for use in full-optical communication. ADVANTAGE - The device ensures that the thickness of uniform dielectric sheet is quarter of the respective optical wavelength, so that the optical dual-steady state threshold value in the composite structure is low. The device has low threshold value in an optical bistable state, and is flexibly adjusted by the chemical potential and incident wavelength of graphene so as to enhance nonlinear effect of the graphene, thus realizing a low-threshold optical dual-stable state. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a PD photonic crystal and graphene composite structure-based optical logic device.