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Optical logic device based on PD photonic crystal and graphene composite structure

A kind of graphene composite, photonic crystal technology

Inactive Publication Date: 2022-01-11
HUBEI UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

The optical Kerr effect is proportional to the strength of the local electric field, therefore, a strong local electric field can increase the third-order nonlinear effect of the material, thereby reducing the threshold of bistability

Method used

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  • Optical logic device based on PD photonic crystal and graphene composite structure
  • Optical logic device based on PD photonic crystal and graphene composite structure
  • Optical logic device based on PD photonic crystal and graphene composite structure

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Embodiment Construction

[0024] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0025] Mathematically, the iteration rule of the PD (Period-Doubling: period doubling) sequence is: S 0 = H, S 1 =HL,S 2 =HLHH,...,S N = S N-1 S N-2 S N-2 ,..., where N (N=0, 1, 2, 3,...) represents the serial number of the sequence, S N Represents the Nth item of the sequence. In the corresponding PD photonic crystal, the letters H and L represent two homogeneous dielectric sheets with high and low refractive indices, respectively.

[0026] figure 1 Shown is a schematic diagram of a composite structure of a centrosymmetric PD photonic crystal and graphene with the sequence number N=2. The centrosymmetric PD photonic crystal with serial number N=2 can be expressed as: HLHHHHLH, where the letters H and L respective...

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Abstract

The invention provides an optical logic device based on a PD photonic crystal and graphene composite structure, and belongs to the technical field of all-optical communication. The composite structure is represented as HLGHHGHHGLH, H and L respectively represent a uniform dielectric sheet I and a uniform dielectric sheet II with different refractive indexes, G is a graphene single layer, and the thickness of the uniform dielectric sheet I and the thickness of the uniform dielectric sheet II are respectively 1 / 4 of the respective optical wavelength. The device has the advantages that the threshold value of the optical bistable state can be reduced, and the like.

Description

technical field [0001] The invention belongs to the technical field of all-optical communication, and relates to an optical logic device based on a composite structure of PD photonic crystals and graphene. Background technique [0002] In all-optical communication, information needs to be stored, transmitted, relayed, judged, timed, amplified, and shaped in the optical domain, which requires vigorous development of all-optical devices that control light. Logic is one of the important categories. Optical bistability is a nonlinear optical effect based on the optical Kerr effect of materials. When the incident light is strong 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. [0003] When the optical bistable state is applied to the optical logic device, the upper and lower thresholds of the bistable state correspond to the decision t...

Claims

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Application Information

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IPC IPC(8): G02F3/02G02F3/00
CPCG02F3/024G02F3/00
Inventor 章普
Owner HUBEI UNIV OF SCI & TECH
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