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A composite structure photonic crystal wavelength division multiplexing device and its application method

A technology of wavelength division multiplexing devices and photonic crystals, applied in optical components, optical waveguides, instruments, etc., can solve the problems of large dispersion angle and beam dispersion, and achieve the effect of large dispersion angle, simple and compact structure, and optimized size

Inactive Publication Date: 2021-05-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main purpose is to design a composite structure device by using the special dispersion characteristics of two-dimensional photonic crystals and the good focusing characteristics of Lunburg lenses, which can not only achieve a large dispersion angle, but also solve the problem of serious dispersion of light beams in the process of photonic crystal transmission.

Method used

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  • A composite structure photonic crystal wavelength division multiplexing device and its application method
  • A composite structure photonic crystal wavelength division multiplexing device and its application method
  • A composite structure photonic crystal wavelength division multiplexing device and its application method

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Embodiment 1

[0040] A compound structure photonic crystal wavelength division multiplexing device, its specific realization structure is as follows figure 1 , figure 2 As shown, the two-dimensional photonic crystal structure including the orthorhombic lattice and the two-dimensional Lunburg lens of the square lattice.

[0041] Two-dimensional photonic crystals are composed of silicon dielectric pillars arranged in an orthorhombic lattice structure, a 1 , a 2 is the lattice constant of the orthorhombic lattice, a 1 =a 2 =510nm, the lattice angle is 75°, that is, the circular lattice in the figure, the silicon dielectric pillars are uniformly distributed, and the radius r of the uniformly distributed silicon dielectric pillars 1 =0.4*a 1 =204nm; one side of the two-dimensional photonic crystal is connected with a two-dimensional Lunburg lens, and the two-dimensional Lunburg lens is composed of silicon dielectric columns arranged in a square lattice.

[0042] The two-dimensional photon...

Embodiment 2

[0055] A method for using the composite structure photonic crystal wavelength division multiplexing device described in embodiment 1, comprising the steps as follows, during use, the wavelength range is 1500nm-1600nm, and the Gaussian beam whose beam waist is 4um is from the angle of incidence of 14 ° The side of the orthorhombic lattice is incident on the device. During this process, the focus point of the beam is on the surface of the two-dimensional Lunburg lens. The beams of different wavelengths such as figure 2 λ in 1 , lambda 2 , lambda 3 , focusing on different positions on the surface of the Lunburg lens.

[0056] Under the same incident angle and working conditions, beams of different wavelengths have different dispersion angles and transmission directions in photonic crystals, such as image 3 As shown, this characteristic can be used for wavelength selection. The transmission effects of three specific wavelengths 1590nm, 1550nm, and 1530nm in the orthorhombic ...

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Abstract

The invention relates to a composite structure photonic crystal wavelength division multiplexing device and a method for using the same, belonging to the technical field of micro-nano photonics integration. The two-dimensional photonic crystal is composed of silicon dielectric columns, which are arranged in a rhombus lattice, and the silicon dielectric columns are evenly distributed; one side of the two-dimensional photonic crystal is connected to a two-dimensional Lumbert lens, and the two-dimensional Lumbert lens is composed of a square lattice structure of photons. crystal composition. The two-dimensional photonic crystal structure of the orthorhombic lattice has strong dispersion properties, which can realize the angular separation of light beams of different wavelengths. The Gaussian beams incident in different wavelength ranges pass through the uniform rhombic lattice area for beam separation, and then a two-dimensional Lumbert lens composed of a gradient square lattice is used to focus the incident beams at different angles to reduce unnecessary broadening in the process of dispersion.

Description

technical field [0001] The invention relates to the technical fields of integrated photonic devices, photonic crystals, and Lunburg lenses, especially the combination of two-dimensional photonic crystal structures of orthorhombic lattices and two-dimensional Lunburg lenses of square lattices to realize angular dispersion and focusing of light beams, belonging to The field of micro-nano photonic integration technology. Background technique [0002] Photonic crystal structure has been a research hotspot in integrated optics in recent years, and has important application value in the integration and miniaturization of integrated photonic devices and lightwave circuits. Photonic crystals are artificial microstructures that are periodically arranged by media with different refractive indices. When light propagates in photonic crystals, it will interact with the periodic structure of photonic crystals, resulting in special optical phenomena such as band gaps. Secondly, photonic c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/12G02B6/122
CPCG02B6/12007G02B6/1225G02B2006/12102G02B2006/12164
Inventor 李炎李利娟李康
Owner SHANDONG UNIV