▎ 摘　　要

NOVELTY - The all-optical switch has two graphene single layers and a Cantor photonic crystal that is provided with a sequence number. A Kangtoir photonic crystalline structure is represented as first preset value, where letters A and B represent two uniform dielectric thin films with different refractive indexes. The Kangtos photonic crystals are provided with independent optical sub-shapes, where the electric field corresponding to the shape is provided with local effect. Two G-single layers are just embedded in the two local electric field strongest position. The composite structure is represented as second preset value, where G represents a graphene single layer. The third-order nonlinear effect of graphene is greatly enhanced to realize low threshold optical bi stable state. USE - All-optical switch with optical bi-stable effect for use in optical communication. ADVANTAGE - The third-order nonlinear effect of graphene is greatly enhanced to realize low threshold optical bi-stable state. The interval between the lower threshold and the upper threshold is reduced with the chemical potential of the graphene. The optical b-stable in the structure can be applied to the all-optical switch. The interval between lower and upper threshold can be flexibly adjusted by chemical potential and incident wavelength of graphene. The threshold value of optical bistable state in the composite structure of photonic crystal and graphene can be low to 10MW/cm2. The thickness of the dielectric thin sheet A and the thin sheet B are all 1/4 of the optical wavelength.