Novel topological photonic crystal structure and optical waveguide

A technology of photonic crystals and optical waveguides, applied in the field of optical waveguides, can solve problems such as single means of implementation and small photonic band gap, and achieve high transmission efficiency, large working bandwidth, and robustness

Active Publication Date: 2021-04-02
江阴多高自动化科技有限公司
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  • Abstract
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Problems solved by technology

Although topologically non-trivial photonic crystals can also be constructed in this way, the implementation method is too simple, and the photonic band gap opened is not large

Method used

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  • Novel topological photonic crystal structure and optical waveguide
  • Novel topological photonic crystal structure and optical waveguide
  • Novel topological photonic crystal structure and optical waveguide

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Embodiment Construction

[0028] In order to make the features, technical solutions and advantages of the present invention clearer, the present invention will be further elaborated below in conjunction with specific embodiments and drawings.

[0029] Such as figure 1 As shown in (a), the novel topological photonic crystal structure of the present invention comprises six dielectric pillars arranged in parallel in the air, and the six dielectric pillars are the same dielectric pillars, and the dielectric pillars can be made of silicon material Cylindrical media column. The cross-section of the unit cell is a regular hexagon. On the cross-section of the unit cell, the axes of the three dielectric columns are respectively located on the three vertices of the first equilateral triangle, and the axes of the other three dielectric columns are respectively located on the second On the vertices of the equilateral triangles, the center of the first equilateral triangle and the center of the second equilateral ...

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Abstract

The invention discloses a novel topological photonic crystal structure and an optical waveguide, and a unit cell of the novel topological photonic crystal structure is formed by arranging six identical dielectric cylinders into two independent regular triangle units and has C3 rotational symmetry. A plurality of structural states of the crystal structure all have a dual Dirac cone cell, and energyband inversion and topological phase transition are achieved by stretching and compressing at least one of the two triangular units on the basis of each cell state having a dual Dirac cone, and a large topological non-mediocre photonic band gap is opened. An optical waveguide is also constructed based on the crystal structure, the topological non-mediocre photonic crystal (PC3) and the topological mediocre photonic crystal (PC1) are combined to support optical unidirectional transmission at the interface to inhibit backscattering, the transmission efficiency is extremely high, the immunity tostructural defects is strong, and three different structural defects can be perfectly passed.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a novel optical waveguide of topological photonic crystals. Background technique [0002] The promotion of topological photonic crystals as topological insulators in the field of optics can be used to control and guide the transmission of light, which is a hot topic in current research. The helical boundary states at the interfaces of photonic crystals with different topologies support unidirectional transmission of light and are immune to structural defects, which have great application prospects in the field of modern optical communications. [0003] Existing research is mainly using the C 6 Rotationally symmetric unit cells construct topological photonic crystals. A double Dirac cone will appear in the energy band diagram of the honeycomb unit cell, and the photonic band gap will be opened by stretching and compressing the honeycomb unit cell to realize topological phase tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/122G02B1/00G02B27/00
CPCG02B6/1225G02B1/005G02B27/0012
Inventor 高永锋金梦成周强宋荷孙佳平贺奕涵沈博闻林昊哲
Owner 江阴多高自动化科技有限公司
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