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Photonic crystal structure with complex unit cells and optical waveguide

A technology of photonic crystals and optical waveguides, applied in the directions of light guides, optics, optical components, etc., can solve the problems of small photonic band gaps and single implementation methods, and achieve the effects of enhanced optical locality, strong immunity, and rich regulation methods.

Pending Publication Date: 2022-06-24
JIANGSU UNIV
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Problems solved by technology

This implementation method is too simple, there are not many ways to control the photonic bandgap, and the opened photonic bandgap is not large

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  • Photonic crystal structure with complex unit cells and optical waveguide
  • Photonic crystal structure with complex unit cells and optical waveguide
  • Photonic crystal structure with complex unit cells and optical waveguide

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Embodiment Construction

[0038] The design of the present invention will be further described in detail below with reference to the description of the drawings and specific embodiments.

[0039] figure 1 (a) shows the complex unit cell structure designed by the present invention. The complex unit cell is composed of 6 sub-cells arranged according to the C6 structure, and the cross-section is a regular hexagonal structure; The photonic crystal structure is formed by adjoining sides and arranged in an array manner, and the distance between the centers of two adjacent complex unit cells is the lattice constant a.

[0040] The subcell is a section with a diameter of 2r 1 The first dielectric column with two cross-sectional diameters of 2r 2 The axes of the second medium column are respectively located on the three vertices of an equilateral triangle and are arranged in parallel, and the side length of the equilateral triangle is L=0.14a.

[0041] In the complex unit cell, the distance from the center o...

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Abstract

The invention provides a photonic crystal structure with a complex unit cell and an optical waveguide. The complex unit cell is formed by arranging six subcells according to a C6 structure, and the section of the complex unit cell is of a regular hexagon structure. The multiple complex unit cells are adjacent in edge-to-edge mode and are arranged in an array mode to form the photonic crystal structure. According to the invention, energy band inversion and topological phase change are realized through three different modes, i.e., compression and stretching of unit cells, change of section diameters of dielectric cylinders and rotation of sub-cells, so that a topological trivialness to topological non-trivialness crystal structure is constructed. An optical waveguide constructed by the crystal structure is larger in photonic band gap and high in photon localization performance, electromagnetic waves in the working bandwidth can be transmitted in a one-way mode along topological common and non-common interfaces, the optical localization is enhanced, backscattering is restrained, and the crystal structure has high immunity to sharp turns and defects.

Description

technical field [0001] The invention relates to the field of topological photonic crystals, in particular to a photonic crystal structure and an optical waveguide with complex unit cells. Background technique [0002] Due to the discovery of the optical integer quantum Hall effect and the quantum spin Hall effect in condensed matter physics, a new research direction, optical topological insulators, has been opened. Furthermore, a scheme to realize topological state is proposed. In optical systems, topological photonic crystal research has strong application prospects, especially the properties of unidirectional transmission and defect immunity of topological states, which can be used in topological photonic devices such as differentiators, hubs, and optical isolators. [0003] The optical quantum spin Hall effect is based on pairwise topological boundary states protected by time-reversal symmetry, and the key is to achieve Kramers degeneracy. However, photons do not have s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/122
CPCG02B6/1225
Inventor 许孝芳黄靖宇张浩翟楠刘雅琪
Owner JIANGSU UNIV
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