Anti-PT symmetric PD photonic crystal structure capable of realizing directional suppression and enhancement of reflected light

A photonic crystal and reflected light technology, applied in the field of all-optical communication, can solve the problems of unfavorable lateral displacement of the reflected beam and large lateral displacement effect of the beam, etc.

Inactive Publication Date: 2022-01-14
HUBEI UNIV OF SCI & TECH
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Problems solved by technology

And near the resonance state, the lateral displacement effect of the beam is the largest, while the resonant mode reflectivity of the PT symmetrical system is generally zero, which is very unfavorable for detecting the lateral displacement of the reflected beam

Method used

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  • Anti-PT symmetric PD photonic crystal structure capable of realizing directional suppression and enhancement of reflected light
  • Anti-PT symmetric PD photonic crystal structure capable of realizing directional suppression and enhancement of reflected light
  • Anti-PT symmetric PD photonic crystal structure capable of realizing directional suppression and enhancement of reflected light

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Embodiment Construction

[0018] 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.

[0019] Mathematically, the iteration rule of the PD (Period-Doubling: period doubling) sequence is: S o = 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.

[0020] figure 1 Shown is a schematic diagram of the Anti-PT symmetric PD photonic crystal structure with the sequence number N=3. The PD photonic crystal with serial number N=3 can be expressed as: HLHHHLHL, wherein the letters H and L respectively represent two kinds of uniform diel...

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Abstract

The invention provides an Anti-PT symmetric PD photonic crystal structure capable of realizing directional suppression and enhancement of reflected light, and belongs to the technical field of all-optical communication. The structure comprises two PD photonic crystals which are formed by sequentially stacking two dielectric sheets with different refractive indexes according to a PD sequence rule, and a symmetrical distribution structure about a central origin is formed; by modulating the refractive index imaginary part of each dielectric sheet, the photonic crystal structure meets Anti-PT symmetric distribution: n(z)=-n *(-z); the entire structure may be represented as HLHHHLHLL'H' L'H'H'H' H'L'H'; the dielectric flakes H and L' represent first dielectric layers of high refractive index and the dielectric flakes H'and L represent second dielectric layers of low refractive index. The structure has the advantages of being capable of achieving directional suppression or enhancement of light wave reflection and the like.

Description

technical field [0001] The invention belongs to the technical field of all-optical communication, and relates to an Anti-PT symmetrical PD photonic crystal structure capable of realizing directional suppression and enhancement of reflected light. Background technique [0002] When there is an imaginary part of the refractive index of the dielectric, that is, when there is gain or loss in the material, the reflection spectra of left and right incident light do not overlap. In particular, when the refractive index of the system satisfies PT (Parity-time: parity-time) symmetry in space, the positions of the reflectivity zeros in the left and right reflection spectra are different. In this way, when light waves of the same wavelength are respectively incident from the left and right directions, there will be a situation where the reflectance of one side is zero and the reflectance of the other side is a finite value. This effect can be applied to optical directional stealth. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35G02F1/355
CPCG02F1/3503G02F1/3523G02F1/353G02F1/3551
Inventor 杨荣
Owner HUBEI UNIV OF SCI & TECH
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