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Chiral super-surface terahertz reflective 90-degree polarizer

A metasurface, terahertz technology, applied in electrical components, antennas, etc., can solve the problems of high processing difficulty in the terahertz frequency band, less than ideal out-of-band suppression, significant asymmetric reflection characteristics, etc., and achieve high polarization conversion efficiency. , Weak asymmetric transmission characteristics, improve the effect of electromagnetic cross-coupling effect

Active Publication Date: 2017-02-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The polarizer can achieve high-efficiency polarization conversion for linear polarization and left / right circularly polarized waves, but the cross polarization conversion efficiency (cross polarization conversion) needs to be improved, and the asymmetric reflection characteristics are significant, with The degree of external suppression is not ideal, the electrical length of the substrate thickness is 1 / 25 wavelength, and it is extremely difficult to process in the terahertz frequency band

Method used

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  • Chiral super-surface terahertz reflective 90-degree polarizer
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  • Chiral super-surface terahertz reflective 90-degree polarizer

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Embodiment

[0033] An asymmetric ELC terahertz reflective polarizer based on a chiral metasurface, such as figure 1 , 2 As shown, the metal chiral structure including the substrate dielectric substrate and the metal chiral structure periodically arranged on the surface of the substrate dielectric substrate; the chiral metasurface structure includes a dielectric material layer and two layers of metal chiral structure surface layers; the two layers The metal chiral structure surface layer is located on both sides of the dielectric material layer. Each layer of the metal chiral structure surface layer is composed of resonant units arranged in a periodic square. The periodic resonant structure has M×N asymmetric L+ cells arranged without spacing. T-shaped metal structure unit, and M=N=50, the resonant unit arrangement structure of the two-layer metal chiral structure surface layer is the same, and the shape structure is a conjugate structure; the resonant unit belonging to the chiral structu...

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Abstract

The invention discloses a chiral super-surface terahertz reflective 90-degree polarizer, belonging to the technical field of electromagnetic wave full-vector transmission control devices. The chiral super-surface terahertz reflective 90-degree polarizer comprises M*N polarization units periodically arranged on a plane, wherein each polarization unit comprises an underlayer dielectric substrate, a front resonance structure arranged on the front of the underlayer dielectric substrate and a back resonance structure arranged on the back of the underlayer dielectric substrate; the front resonance structure is a centrosymmetric structure; the back resonance structure and the front resonance structure are in 90-degree conjugation; and M and N are both an integer greater than 20. In the invention, by use of a micro-nano production technology and in comparison with the technology of realizing a terahertz reflective polarizer by use of structures such as ion etching and electro-optical crystal, the chiral super-surface terahertz reflective 90-degree polarizer disclosed by the invention has the advantages of simple structure, small volume, low processing cost and high controllable precision.

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] Terahertz is a unique electromagnetic wave band between microwave and infrared light. It has abundant spectrum resources (frequency ranges from 0.1THz to 10THz) and moderate beamwidth. It has wide application in future high-speed wireless communication and high-resolution imaging radar. The application prospect is an international research hotspot in related fields. [0003] Metamaterials have extraordinary electromagnetic properties that natural electromagnetic materials do not have, such as negative refraction, anomalous Cerenkov radiation, anomalous Doppler effect, super-resolution imaging, stealth, and super-strong electromagnetic polarization rotation capabilities etc., and have broad application prospe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/24
Inventor 兰峰杨梓强史宗君
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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