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Terahertz reflective polarization converter based on z-type metasurface

A metasurface, reflective technology, used in antennas, electrical components, etc., can solve problems such as large thickness and complex structure, and achieve the effect of small size, high integration and simple structure

Active Publication Date: 2019-02-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many traditional polarization conversion principles, such as Faraday effect and birefringence principle, but the polarization conversion devices realized by these principles all show certain shortcomings: very large thickness and complex structure
At present, the research on metamaterials at home and abroad is still in its infancy, and there are still many problems to be solved, such as the problem of working bandwidth and efficiency

Method used

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  • Terahertz reflective polarization converter based on z-type metasurface
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Embodiment

[0032] A reflective terahertz polarization converter based on a Z-type metasurface, such as Figure 1-3 As shown, it includes a Z-shaped metal structure on the top layer, a dielectric substrate in the middle and a metal layer on the bottom; the periodic resonant structure has N×N units arranged without spacing, and N≥20. The chiral metasurface is composed of a central line and two side arms located at both ends of the central line and perpendicular to the central line. The inclination angle α of the Z-shaped metal surface relative to the x-axis is 30 degrees.

[0033] The substrate material is a single crystal quartz crystal with a crystal orientation of 001, a dielectric constant of about 4.41, a magnetic permeability of 1, a loss tangent of about 0.0004, and a thickness of t; the line material of the metal resonant structure The conductivity is 3.8×10 7 S / m, aluminum metal with thickness h.

[0034] The structural parameters are: p=550 μm, t=180 μm, w=410 μm, d=30 μm, g=9...

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Abstract

A terahertz reflective polarization converter based on a Z-type metasurface belongs to the technical field of electromagnetic wave full vector transmission control devices. The present invention includes a substrate dielectric substrate and a top metal chiral structure layer and a bottom metal layer respectively arranged on the upper and lower surfaces of the substrate dielectric substrate. It is characterized in that the metal chiral structure layer is provided with periodic orthogonal Arranged rectangular resonant units, each resonant unit is provided with a Z-shaped metal resonant structure, the Z-shaped metal resonant structure is composed of a central line and two side arms respectively arranged at both ends of the central line and perpendicular to the central line, The two side arms are respectively arranged on both sides of the central line and are electrically connected to the central line, and the included angle between the central line and one side of the rectangular resonant unit is 30°. The invention can realize the polarization deflection of the reflected wave in an ultra-wide frequency band, not only can realize the 90-degree polarization deflection of the linearly polarized wave, but also can realize the polarization deflection from the linearly polarized wave to the circularly polarized wave.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave full-vector transmission control devices, and relates to a reflective terahertz linear polarization / left-handed and right-handed circular polarizer. Background technique [0002] Polarization converter is a very important device in the application of electromagnetic wave propagation. There are many traditional polarization conversion principles, such as Faraday effect and birefringence principle, but the polarization conversion devices realized by using these principles all show certain shortcomings: very large thickness and complex structure. [0003] Metamaterial refers to an artificial material whose characteristic scale is much smaller than the working wavelength, which can realize many functions that cannot be realized by natural materials, such as negative refraction, stealth materials and super-resolution imaging. To realize the macro-control of electromagnetic waves, the curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/24
CPCH01Q15/242H01Q15/244H01Q15/248
Inventor 兰峰杨梓强史宗君李孟
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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