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All-optical switch based on Period-Double photonic crystal

An all-optical switch and photonic crystal technology, applied in the field of all-optical communication, can solve problems such as lowering the bistable threshold

Pending Publication Date: 2021-12-03
HUBEI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • All-optical switch based on Period-Double photonic crystal
  • All-optical switch based on Period-Double photonic crystal
  • All-optical switch based on Period-Double photonic crystal

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Embodiment Construction

[0023] 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.

[0024] Mathematically, the iteration rule of the Period-Doubling (period doubling: PD) 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.

[0025] figure 1 Shown is a schematic diagram of the composite structure of PD photonic crystal and graphene with sequence number N=3. The PD with serial number N=3 can be expressed as: HLHHHLHL, where the letters H and L respectively represent two kinds of uniform dielectric sheets w...

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Abstract

The invention provides an all-optical switch based on a Period-Double photonic crystal, and belongs to the technical field of all-optical communication. The all-optical switch comprises a plurality of first dielectric layers, a plurality of second dielectric layers and two graphene single layers, the first dielectric layers are marked as H, the second dielectric layers are marked as L, and the graphene single layers are marked as G. The layered structure of the all-optical switch is represented as HL1GL2HH1GH1HL2GL1HL, L1GL2 and L2GL1 both represent three-layer structures formed by embedding the graphene single layers into the second dielectric layers, H1GH1 represents a three-layer structure formed by embedding a graphene single layer into the middle part of the first dielectric layer, the thicknesses of the first dielectric layer and the second dielectric layer are respectively 1 / 4 of respective optical wavelengths, and the first dielectric layer and the second dielectric layer are respectively two uniform dielectric sheets with different refractive indexes. The product can be applied to an all-optical switch.

Description

technical field [0001] The invention belongs to the technical field of all-optical communication, and relates to an all-optical switch based on Period-Doubling photonic crystals. Background technique [0002] In all-optical communication, information needs to be stored, transmitted, relayed, judged, timed, amplified, and shaped in the optical domain. Optical switches are 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 an all-optical switch, the upper and lower thresholds of the bistable state correspond to the trigger thresholds of turning on and turning off the all-optical switch respectively; The input light ener...

Claims

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Application Information

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IPC IPC(8): G02F3/02G02B1/00
CPCG02F3/024G02B1/005
Inventor 方明
Owner HUBEI UNIV OF SCI & TECH
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