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Design method of photonic crystal structure with topological interface state

A photonic crystal and structure design technology, applied in optics, optical components, instruments, etc., can solve the problem of unrealized manipulation of topological interface states, and achieve the effect of adjustability

Pending Publication Date: 2022-06-24
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This scheme is based on the topological interface state and the optical Kerr effect to limit t

Method used

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  • Design method of photonic crystal structure with topological interface state
  • Design method of photonic crystal structure with topological interface state
  • Design method of photonic crystal structure with topological interface state

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Experimental program
Comparison scheme
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Embodiment 1

[0038] like figure 1 As shown, a method for designing a photonic crystal structure with topological interface states includes the following steps:

[0039] S1: Build a one-dimensional PC unit with two different dielectric layers;

[0040] It should be noted that it is preferred to use two different dielectric layers to construct a one-dimensional PC unit, such as figure 1 The shown (A represents the first dielectric layer, B represents the second dielectric layer) is a one-dimensional PC unit in TE mode, wherein the two different media have different refractive indices, when the electric field wave vector is at the included angle θ i through a section of thickness d i , the refractive index is n i When the medium is , the one-dimensional PC unit phase change transmission matrix is:

[0041]

[0042] The phase-change transfer matrix of the complex periodic structure of the one-dimensional topological interface state is obtained by multiplying the transfer matrix of eac...

Embodiment 2

[0050] In this embodiment, the first dielectric layer is silicon dioxide, and its refractive index is n a =1.46, the second dielectric layer is titanium dioxide, the refractive index n b =2.4, if there is an interface state in the energy band diagram of the arrangement of the first dielectric layer and the second dielectric layer at the set angle, the following predicted intersection formula should be satisfied:

[0051]

[0052] where m 1 respectively represent the mth required for the existence of an interface state in the energy band diagram of the PC unit composed of the first dielectric layer and the second dielectric layer at a set angle 1 energy band, m 2 Represents the mth required for the existence of an interface state in the energy band diagram of the PC unit composed of the first dielectric layer and the second dielectric layer at a set angle 2 Strip energy band, α represents the band number scale factor.

[0053] In a specific experiment, in order to obtain...

Embodiment 3

[0060] In this embodiment, on the basis of the above-mentioned embodiment, the topological interface state of the composite periodic structure is analyzed through experiments in TE and TM modes.

[0061] like Figure 4 As shown in (a) and (b), PC1 (that is, the combination of N first PC units) in the TE and TM modes is a partial enlarged view of the relationship between the energy band and the incident angle. There is a closed point in TE, while in the same case TM Open. Therefore, the TE has an "open-closed-open" state, while the TM mode at this angular frequency is always in the "closed" state.

[0062] If the band gap of TM is always open but not closed, there must be no interface state, and TE may have interface state. Whether the specific topological phase changes needs further analysis and research. like Figure 5 In the middle (a) is the schematic diagram of the energy band of PC1 in TE mode, the circled part is the partially enlarged part, Figure 5 In (c) a partia...

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Abstract

The invention discloses a method for designing a photonic crystal structure with a topological interface state. The method comprises the following steps: S1, constructing a one-dimensional PC unit by using two different dielectric layers; and S2, sequentially laminating a plurality of one-dimensional PC units to obtain a composite periodic structure in a one-dimensional topological interface state. The one-dimensional PC units with different lattice constants are combined to construct the composite periodic structure of the one-dimensional topological interface state, the obtained photonic crystal has the topological interface state related to control spinning, the topological interface state can be directly displayed through a transmission spectrum, and meanwhile adjustability of the topological interface state related to spinning is achieved.

Description

technical field [0001] The invention relates to the technical field of photonic crystal structures, and more particularly, to a method for designing a photonic crystal structure with topological interface states. Background technique [0002] In recent years, topological photonics has flourished, revolutionizing the method of controlling the behavior of light, engineering topological interface states in optical environment has received great attention in recent years, and has been widely used on a wide range of platforms, becoming the current topological A powerful driver of photonics research. Photonic crystal refers to an artificial dielectric structure formed by periodic arrangement of media with different refractive indices with photonic band gap characteristics. Photonic crystals have the function of wavelength selection, which can selectively pass light of a certain wavelength band and prevent light of other wavelengths from passing through. According to the dimensio...

Claims

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Application Information

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IPC IPC(8): G02B1/00G02B27/00
CPCG02B1/005G02B27/0012Y02E60/00
Inventor 张欣郭媛张开颜钟佳琳姚源卫吴福根俞行龙蔡婧王燕萍
Owner GUANGDONG UNIV OF TECH
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