All-optical switch and optical storage based on optical bistability of graphene

Abstract

The invention discloses an all-optical switch and an optical storage based on the optical bistability of graphene. The manufacturing method of the all-optical switch and the optical storage comprisesthe following steps: firstly using the loss and the gain of materials together to finely modulate the real and imaginary parts of the refractive index of doped dielectric material with MgF2 and ZnS asa matrix, so that refractive indexes thereof satisfy the parity-time symmetry to form a resonant cavity with a parity-time symmetric structure; then, embedding the graphene in the center of the structure, and achieving the low-threshold optical bistability by using the third-order nonlinear effect of the graphene, wherein the threshold of the bistable state is as low as GW / cm2 order; and finally,using the bistable effect of the graphene to manufacture the all-optical switch and the optical storage in all-optical communication systems. The all-optical switch and the optical storage based on the optical bistability of the graphene provide a new option for existing optical storage of the all-optical switch. The threshold of the switch can be flexibly adjusted by the chemical potential of the graphene.

Description

technical field [0001] The invention belongs to the technical field of all-optical communication, and relates to an all-optical switch and an optical memory used in an all-optical communication system, in particular to an all-optical switch and an optical memory based on a graphene optical bistable state. Background technique [0002] With the development of all-optical network and information detection technology, there is an urgent need to develop all-optical switches and optical memories. By applying the optical bistability effect of nonlinear materials, all-optical switches and optical memories can be realized. [0003] In the past, the localization of the electric field was generally enhanced by the surface plasmon polaritons or the Fabry-Perot cavity structure of the material to achieve low-threshold optical bistability, and the loss of the material should be minimized. [0004] Surface plasmons require transverse magnetic waves, which are generated in metal materials...

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Problems solved by technology

Moreover, surface plasmons can only be excited in special metamaterials and Kretschmann structures

[0005] If a Bragg grating is used to form a Fabry-Perot cavity, the larger the period number of the grating, the better the monochromaticity of the defect mode and the stronger the localization of the electric field, but due to the loss in the material, the transmitted light intensity will decrease accordingly. reduce

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