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Two-dimensional combined type photonic crystal and application thereof

A photonic crystal and combined technology, applied in the direction of light guide, optics, optical components, etc., can solve the problem of single light guide angle deflection

Inactive Publication Date: 2014-12-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, most of the current research on the propagation direction of self-collimating beams only focuses on one type of photonic crystal. After introducing a rectangular air defect inside the self-collimating photonic crystal, the propagation direction of the outgoing beam can only be 60° relative to the incident beam. ° or 90° change, the deflection of the light guide angle is relatively simple

Method used

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  • Two-dimensional combined type photonic crystal and application thereof
  • Two-dimensional combined type photonic crystal and application thereof
  • Two-dimensional combined type photonic crystal and application thereof

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Embodiment 1

[0062] A two-dimensional combined photonic crystal, comprising an upper half photonic crystal and a lower half photonic crystal, the upper half photonic crystal is connected to the lower half photonic crystal, and the upper half photonic crystal is a triangular lattice photonic crystal crystal, the triangular lattice photonic crystal includes a flat base and primitive cell units arranged on the flat base in a triangular lattice periodic arrangement, the lower half of the photonic crystal is a square lattice photonic crystal, The square-lattice photonic crystal includes a flat base and primitive cell units arranged on the flat base periodically according to a square lattice, the material of the flat base is a silicon medium, and the silicon medium is The refractive index n is 3.4, and the primitive cell unit is a cylindrical dielectric column, and the cylindrical dielectric column is an air column, and the lattice constant a of the triangular lattice photonic crystal is 1, and t...

Embodiment 2

[0076] According to the two-dimensional composite photonic crystal described in Embodiment 1, the difference is that, in the triangular lattice photonic crystal, the self-collimation propagation direction ΓM of the light beam is along the vertical direction, along the vector The direction introduces a rectangular air defect, and the beam self-collimation propagation direction ΓM is perpendicular to the shape of the equifrequency lines in the triangular lattice photonic crystal. Such as Figure 8 shown.

Embodiment 3

[0078] According to the two-dimensional composite photonic crystal described in Embodiment 1, the difference is that, in the triangular lattice photonic crystal, the self-collimation propagation direction ΓM of the light beam is along the vertical direction, along the vector The direction introduces a rectangular air defect, and the beam self-collimation propagation direction ΓM is perpendicular to the shape of the equifrequency lines in the triangular lattice photonic crystal. Such as Figure 10 shown.

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Abstract

The invention relates to a two-dimensional combined type photonic crystal. The lattice constant a of a triangular-lattice photonic crystal is 1, and the radius of cross section of an air column is 0.25a. The lattice constant a of a square-lattice photonic crystal is 0.6, and the radius of the cross section of an air column is 0.21 a. One rectangular air defect is introduced into the square-lattice photonic crystal, and the other rectangular air defect for realizing that light beams deflect by 30 degrees, 60 degrees, 150 degrees and 210 degrees is introduced into the triangular-lattice photonic crystal. The relationship between the lattice constant of the triangular-lattice photonic crystal and the lattice constant of the square-lattice photonic crystal is adjusted, so that the novel two-dimensional combined type photonic crystal is formed, and the auto-collimating transmission of the light beams in the triangular-lattice photonic crystal and the square-lattice photonic crystal is simultaneously realized. The two-dimensional combined type photonic crystal realizes that the beams deflect by 30 degrees, 60 degrees, 150 degrees and 210 degrees in the auto-collimation direction, a new way is provided for research on the light guide direction of the photonic crystal, and light transmission is better controlled.

Description

technical field [0001] The invention relates to a two-dimensional combined photonic crystal and its application, and belongs to the technical field of information optical photonic crystals. Background technique [0002] In 1987, Yablonovitch and others proposed the concept of photonic crystals. Photonic crystals refer to periodic dielectric structures with photonic band gaps. Light whose frequency falls within the photonic band gap cannot be transmitted. In recent years, in addition to the photonic bandgap properties, anomalous dispersion properties have gradually attracted people's attention, including self-collimation properties. [0003] In 1999, Kosaka et al. discovered the self-collimation effect in photonic crystals, which is different from real optical waveguides, that is, for a certain crystal lattice, a self-collimated beam of a specific frequency It can propagate in a specific direction inside the photonic crystal without diffraction. The propagation direction of...

Claims

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Application Information

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IPC IPC(8): G02B6/122G02B6/125
Inventor 杨修伦范冉冉黄哲王林辉
Owner SHANDONG UNIV