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A dynamically controlled terahertz metasurface device based on vanadium dioxide

A vanadium dioxide, dynamic control technology, applied in instruments, nonlinear optics, optics, etc., can solve the problems of poor enhancement effect, single split resonator ring and double split resonator ring structure, etc., to achieve surface magnetic field enhancement. Effect

Active Publication Date: 2020-08-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The single split resonator and the double split resonator can realize the enhancement of the surface magnetic field through the terahertz electric field, but the enhancement effect is not good, and the single split resonator and the double split resonator have a single structure. Once formed, they can only be controlled by the incident electric field. make adjustments

Method used

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  • A dynamically controlled terahertz metasurface device based on vanadium dioxide
  • A dynamically controlled terahertz metasurface device based on vanadium dioxide
  • A dynamically controlled terahertz metasurface device based on vanadium dioxide

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Embodiment

[0024] Such as figure 1 Shown is a schematic structural diagram of a vanadium dioxide-based dynamically controlled terahertz metasurface device provided by the present invention; it includes a silicon substrate, a surface magnetic field enhancement structure formed on the silicon substrate, and a surface formed on the lower surface of the silicon substrate. Metal layer; wherein, the magnetic field enhancement structure includes a plurality of unit structures arranged in an array, and the unit structures include Archimedes spiral metal and strip-shaped vanadium dioxide. By adjusting the helical coil number, width, gap, and the length and width of vanadium dioxide, the metasurface device works in the terahertz frequency band.

[0025] The present invention provides a dynamic control terahertz metasurface device based on vanadium dioxide, which combines vanadium dioxide with metal to form a surface magnetic field enhancement structure, such as figure 1 As shown, the direction of...

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Abstract

A dynamic control terahertz metasurface device based on vanadium dioxide belongs to the technical field of electromagnetic functional devices. The metasurface device includes a substrate, a surface magnetic field enhancement structure formed on the substrate, and a metal layer formed on the lower surface of the substrate; wherein, the magnetic field enhancement structure includes a plurality of unit structures arranged in an array, and the unit structure includes Al Kimedesian spirals and vanadium dioxide strips. In the metasurface device of the present invention, vanadium dioxide is combined with metal to form a surface magnetic field enhancement structure. Under laser irradiation, the surface magnetic field of the metasurface device is enhanced by 124.48 times compared with the incident magnetic field, realizing the enhancement of the surface magnetic field; and Under no laser irradiation, the surface magnetic field of the metasurface device is only 1.57 times stronger than the incident magnetic field, and the difference between the two is 79 times. The dynamic regulation of the surface magnetic field is realized, which can be regarded as a switch.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic functional devices, in particular to a dynamic control terahertz metasurface device based on vanadium dioxide. Background technique [0002] The research of dynamically controlled or tunable terahertz devices is a hot direction at present and a development trend of future device research. The research of tunable devices based on metamaterials usually changes the frequency or amplitude of the resonance point through different external conditions, such as light, electric field, magnetic field, temperature, etc. This composite terahertz dynamic device combines the characteristics of metamaterials and semiconductor materials. It can not only produce a good static frequency response to terahertz waves, but also dynamically control the terahertz waves through external excitation conditions, thereby realizing real-time dynamics of terahertz waves. . For example, tunable terahertz modulators can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/00G02F1/017
CPCG02F1/0081G02F1/017
Inventor 郝晓林张雅鑫杨梓强梁士雄施奇武
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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