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Compact microwave topology beam splitter

A beam splitter and compact technology, applied in the field of compact microwave topology beam splitters, can solve the problems of insufficient compact structure, crosstalk, unfavorable integration, etc., and achieve the effect of high-efficiency transmission and anti-crosstalk transmission

Active Publication Date: 2022-05-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The topological beam splitter based on chiral magneto-optic crystals needs at least four magneto-optic crystals to realize four channels because the one-way waveguide transmits in opposite directions along two parallel boundaries, and the structure is also not compact enough (Tunable one-way cross- waveguide splitter based on gyromagnetic photonic crystal); in addition, the beam splitter composed of chiral honeycomb magneto-optic crystal, because its unidirectional boundary state can exist simultaneously with zigzag boundary and armchair boundary, so it will cause inevitable crosstalk
[0004] All in all, for the current existing structure to achieve multi-channel, a larger structure is required, which is not conducive to integration

Method used

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Experimental program
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Effect test

Embodiment 1

[0071] Figure 4 Figure a is a structural diagram of an embodiment of the compact microwave topological beam splitter of the present invention, and its structural principle is the same as figure 1 structure is consistent. Each rectangular honeycomb antichiral magneto-optic photonic crystal is 25a long and 8 honeycomb lattices 3 wide. The distance between the first antichiral magneto-optic crystal 1 and the second antichiral magneto-optic crystal 2 and the splicing line is 0.3a. The lattice constant a of the honeycomb lattice 3 is 10mm, and the radius of the dielectric column 12 is 0.15a. The excitation frequency range of the first point light source 11 and the second point light source 12 is 9.1-9.4 GHz. Figure 4 Figures b, c, d and e of the Figure 4 Figure a corresponds to the experimental transmission spectra of the first channel 6, the second channel 7, the third channel 8 and the fourth channel 9. Due to the inevitable operational error caused by the experimental mea...

Embodiment 2

[0074] Figure 6 It is an embodiment of a compact microwave topological beam splitter of the present invention with controllable splitting ratio. Except that the source conditions are different, all the other features are the same as in Example 1. Figure 6 The electric field intensities of the first channel 6 and the second channel 7 are calculated and displayed, so that the light splitting ratio of the first channel 6 and the second channel 7 can be clearly obtained. Figure 6 In the figure a, the electromagnetic wave is incident on the lower zigzag boundary 41 from the -x direction at an angle of 30°, and the waveguide with the splitting ratio of the first channel 6 and the second channel 7 at the lower zigzag boundary 41 is 1:5 through linear scanning calculation , Figure 6 In Figure b, when the electromagnetic wave is incident on the lower zigzag boundary 41 from the -x direction at an angle of 60°, a waveguide with a splitting ratio of the first channel 6 and the seco...

Embodiment 3

[0076] Figure 7 A schematic structural diagram of an embodiment of a compact microwave topological beam splitter of the present invention that realizes two-way four-channel and controllable splitting ratio of each channel, which is the source of changing the upper zigzag boundary 42 on the basis of embodiment 2 The excitation conditions control the light splitting ratio of the third channel 8 and the fourth channel 9, and the rest of the features are the same as those in Embodiment 2. On the upper zigzag boundary 42 electromagnetic waves are incident from the +x direction at an angle of 30°, and the light splitting ratio of the third channel 8 and the fourth channel 9 on the upper zigzag boundary 42 is 5:3; while at the lower zigzag boundary 41 electromagnetic waves are incident at 30° The angle is incident from the -x direction, and the lower zigzag boundary 41 is obtained, and the light splitting ratio of the first channel 6 and the second channel 7 is 3:5. Through this em...

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Abstract

The invention discloses a compact type microwave topology beam splitter. The beam splitter comprises a first anti-chiral magneto-optical photonic crystal and a second anti-chiral magneto-optical photonic crystal which have rectangular two-dimensional cross sections and are opposite in magnetization; each of the first anti-chiral magneto-optical photonic crystal and the second anti-chiral magneto-optical photonic crystal comprises a plurality of rows of honeycomb-shaped lattices formed by periodically arranging circular dielectric cylinders, and the adjacent honeycomb-shaped lattices in the same row share the two dielectric cylinders in the middle; all the dielectric cylinders are arranged in an air background; a first anti-chiral magneto-optical photonic crystal and a second anti-chiral magneto-optical photonic crystal which are equal in size and opposite in transmission direction are spliced together, and a first point light source and a second point light source are placed at the two ends of a splicing line respectively. The invention designs a multi-channel, anti-crosstalk, compact, deployable and topologically protected beam splitter which cannot be realized by the existing beam splitter at the same time, and has great significance for optical path integration and efficient transmission of optical communication.

Description

technical field [0001] The invention belongs to the fields of microwave optics, topological photonics and magneto-optical photonic crystals, and in particular relates to a compact microwave topological beam splitter. Background technique [0002] Beam splitter is the key device of ultra-dense integrated optical circuit, which has the advantage of improving transmission efficiency in optical communication. In recent years, optical beam splitters based on photonic crystal waveguides have been favored by a wide range of researchers. A photonic crystal waveguide beam splitter is a device that utilizes the property of line defects to guide light to realize optical beam splitting. However, beam splitters composed of ordinary photonic crystal waveguides have no topological protection and suffer from huge backscattering losses in essence (Gao Zhen et al. proposed in the article Guiding,bending,andsplitting of coupleddefect surface modes in asurface-wave photonic crystal Building c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00
CPCG02B1/005Y02D30/70
Inventor 李志远覃秋蒙陈剑锋
Owner SOUTH CHINA UNIV OF TECH
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