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Adjustable and controllable reflection type terahertz polarization converter based on vanadium dioxide

A polarization converter, vanadium dioxide technology, applied in polarization elements, instruments, optics, etc., to achieve the effect of easy operation, simple and convenient active control, flexibility and extensiveness

Active Publication Date: 2021-06-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, based on two-dimensional metamaterials / metasurfaces, a large number of polarization conversion functional devices that meet the needs of practical applications have been realized. However, with the advancement of technology, passive metasurfaces can no longer meet current application requirements, and polarization conversion devices are gradually becoming multifunctional. Tunable active direction, the integration of tunable and diverse functions into a single metasurface has become an emerging research field

Method used

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  • Adjustable and controllable reflection type terahertz polarization converter based on vanadium dioxide
  • Adjustable and controllable reflection type terahertz polarization converter based on vanadium dioxide
  • Adjustable and controllable reflection type terahertz polarization converter based on vanadium dioxide

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Embodiment 1

[0047] In order to achieve the above object, the technical solution adopted in the embodiment of the present invention:

[0048] 1. The unit structure size of the reflective terahertz polarization converter based on vanadium dioxide is 100 μm × 100 μm, which is an obliquely symmetrical rectangle composed of aluminum metal reflective layer, polyimide dielectric layer, aluminum and vanadium dioxide The resonant ring is composed of a periodic structure arrangement in the x and y directions, and the specific unit structure period can be determined according to the actual situation.

[0049] Among them, the thickness t of the aluminum metal layer 1 =200nm, the thickness t of the polyimide dielectric layer 2 =30μm, the specific parameters of the obliquely symmetrical rectangular resonant ring see figure 2 .

[0050] 2. The structure is designed by using an oblique symmetrical metal resonant ring. When the conductivity is low (10S / m) and high conductivity (200000S / m), the ring cu...

Embodiment 2

[0056] The scheme in embodiment 1 is further introduced below in conjunction with specific numerical values, see the following description for details:

[0057] A vanadium dioxide-based tunable reflective terahertz polarization converter consists of a three-layer structure, including: thickness t 1 = 200nm aluminum reflective layer, thickness t 2 =30μm polyimide dielectric layer, obliquely symmetrical rectangular resonant ring composed of aluminum and vanadium dioxide. The thickness of the rectangular resonant ring is t 1 = 200nm. (see image 3 As shown in (b), the period P of the unit structure is 100 μm.

[0058] see figure 2 , In the embodiment of the present invention, there is an obliquely symmetrical rectangular resonant ring, and the rectangular ring is composed of two obliquely symmetrical U-shaped rings made of aluminum metal and phase change material vanadium dioxide wire grid. Thickness is t 1 = 200nm. Among them, the structural parameters of the aluminum m...

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Abstract

The invention discloses an adjustable and controllable reflection type terahertz polarization converter based on vanadium dioxide, wherein an efficient and tunable reflection type polarization converter is realized based on a phase change process of vanadium dioxide from an insulation state to a metal state. The polarization converter has an active adjustment and control function on terahertz waves, wherein the unit structure of the polarization converter is composed of a three-layer structure, the bottom layer is an aluminum metal reflecting layer, the middle layer is a polyimide dielectric layer, the top layer is a double-skew symmetrical rectangular resonant ring composed of aluminum metal and phase-change material vanadium dioxide, and periodical arranging is performed in the x and y directions to form a metasurface microstructure. According to the invention, the polarization converter has an active regulation and control function on reflection amplitude under high polarization conversion efficiency, has very strong robustness on perturbation conditions such as structural defects of the polarization converter, external environment and the like, overcomes the defects of passive regulation and control in a traditional structural device, and can realize regulation and control on amplitude at different temperatures.

Description

technical field [0001] The invention relates to the field of metasurface functional devices in the terahertz band, in particular to an adjustable reflective terahertz polarization converter based on vanadium dioxide. Background technique [0002] Terahertz (THz for short) waves are located in the transition region between electronics and photonics, and between microwave and infrared (0.1-10 THz) in the electromagnetic spectrum. The unique spectral position makes THz waves have microwave penetration and optical imaging functions, and also exhibits many electromagnetic properties that microwave and infrared bands do not have, such as broadband, coherence, transient, and lower photon energy. [0003] Polarization is one of the essential properties of electromagnetic waves. Electromagnetic waves can load richer information through polarization. With the development of 5G and 6G communication technologies, the requirements for the ability of electromagnetic waves to carry informa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01G02B5/30G02B1/00
CPCG02F1/01G02F1/0102G02B5/30G02B1/002
Inventor 欧阳春梅赵京韩家广田震谷建强许全张伟力
Owner TIANJIN UNIV
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