Trigger threshold adjustable optical logic device based on graphene

Abstract

The invention provides a trigger threshold adjustable optical logic device based on graphene, and belongs to the technical field of all-optical communication. The optical logic device comprises a plurality of first dielectric layers A, a plurality of second dielectric layers B and four graphene single layers G and is represented as ABABBBABABB1GB2BB3GB4BB4GB3BB2GB1BABABBBABA, and B1GB2, B2GB1, B3GB4 and B4GB3 all represent sandwich structures formed by embedding the graphene single layers into the second dielectric layers; the first dielectric layer and the second dielectric layer are two uniform dielectric sheets with different refractive indexes, the optical logic device has four optical sub-forms, electric fields corresponding to the optical sub-forms have a local effect, the four graphene single layers are respectively embedded in the strongest position of the local electric field corresponding to one sub-form, and the third-order nonlinear effect of the graphene single layer is enhanced, so that the low-threshold optical bistable state is realized; the thickness of the first dielectric layers and the thickness of the second dielectric layers are 1 / 4 of the optical wavelength of the first dielectric layers and the second dielectric layers respectively. The device has the advantages of low optical bistable threshold and the like.

Description

technical field [0001] The invention belongs to the technical field of all-optical communication, and relates to a graphene-based trigger threshold-adjustable optical logic device. Background technique [0002] In all-optical communication, it is necessary to store, relay, timing, judge, amplify and shape signals in the optical domain, which requires the use of optical logic devices, and optical logic devices based on optical bistable states are important. of a class. [0003] Optical bistability is a nonlinear optical effect based on the optical Kerr effect of materials. When the incident light intensity is large enough, one input light intensity value can correspond to two different output light intensity values, that is, one incident light intensity value can induce two stable resonant output states. When the optical bistable effect is applied to an optical logic device, the upper and lower thresholds of the bistable state correspond to the trigger thresholds of logic 1...

AI Technical Summary

Problems solved by technology

In quasi-photonic crystals or non-periodic photonic crystals, there are natural defects, and the number of defect modes increases geometrically with the increase of the sequence number, which is the optical fractal effect

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