Graphene-vanadium dioxide metamaterial absorber and tunable terahertz device

A vanadium dioxide resonator, vanadium dioxide technology, applied in the field of electromagnetic metamaterials, can solve the problems of poor tunability, single function, insufficient performance indicators, etc.

Active Publication Date: 2021-07-06
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the problems in the prior art, the present invention provides a graphen

Method used

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  • Graphene-vanadium dioxide metamaterial absorber and tunable terahertz device
  • Graphene-vanadium dioxide metamaterial absorber and tunable terahertz device
  • Graphene-vanadium dioxide metamaterial absorber and tunable terahertz device

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Experimental program
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Embodiment 1

[0051] Such as Figure 1-3 As shown, a graphene-vanadium dioxide metamaterial absorber provided in this embodiment has a multilayer structure, and according to the structural order from top to bottom, the metamaterial absorber includes: vanadium dioxide resonator array 1, continuous graphite Alkene layer 2, Topas dielectric layer 3, and metal layer 4.

[0052] Wherein, the vanadium dioxide resonator array 1 includes a plurality of resonator units 11 arranged in an array along the horizontal plane, and the resonator units 11 are made of vanadium dioxide material; the resonator unit 11 is an integrated I-shaped, including The first horizontal plate, the second horizontal plate and the middle strip; the length of the first horizontal plate and the second horizontal plate are equal and parallel to each other, and the two ends of the middle strip are respectively fixedly connected with the midpoints of the first horizontal plate and the second horizontal plate The heights of the f...

Embodiment 2

[0061] The difference between the graphene-vanadium dioxide metamaterial absorber provided in this embodiment and the embodiment 1 is that the optimal parameter setting of the metamaterial absorber is given in this embodiment. In this embodiment, the angle between the extension direction of the middle strip of each resonator unit 11 in the vanadium dioxide resonator array 1 and the X-axis direction of the horizontal plane is 45°, and the structural unit period of the resonator unit 11 is P = 30 μm; in the resonator unit 11: T 1 = 2 μm, L 1 = 23 μm, L 2 = 13 μm, W = 1 μm; in continuous graphene layer 2: T 2 =1nm; in Topas dielectric layer 3, ε 1 =2.35, T 3 =14.5μm; in metal layer 4: T 4 = 0.3 μm.

[0062] In the metamaterial absorber, the structural and geometric parameters have a very significant impact on the performance of the product, and under the parameters of this example, the metamaterial absorber exhibits the best performance. Under this structure, when the Ferm...

Embodiment 3

[0066] This embodiment provides a tunable terahertz device, which includes: a metamaterial absorber, a temperature control module, and a circuit module.

[0067] Wherein, the metamaterial absorber adopts the graphene-vanadium dioxide metamaterial absorber in Embodiment 1, and the metamaterial absorber is used for electromagnetic wave absorption. Among them, the tunable terahertz device realizes the dynamic tuning of the operating frequency band of the metamaterial absorber by adjusting the Fermi level and surface conductivity of graphene in the continuous graphene layer 2; The conductivity of the vanadium dioxide material in the resonator array 1 realizes the dynamic tuning of the absorption rate of the metamaterial absorber for electromagnetic waves in the same frequency band.

[0068] In this embodiment, the temperature control module is used to adjust the ambient temperature of the metamaterial absorber, so that the vanadium dioxide material of the resonator unit 11 in the ...

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Abstract

The invention relates to the field of electromagnetic metamaterials, in particular to a graphene-vanadium dioxide metamaterial absorber and a tunable terahertz device. The metamaterial absorber is of a multi-layer structure, and according to the structural sequence from top to bottom, the metamaterial absorber comprises a vanadium dioxide resonator array, a continuous graphene layer, a Topas dielectric layer and a metal layer. The vanadium dioxide resonator array comprises a plurality of resonator units which are arranged in an array along the horizontal plane and are made of vanadium dioxide materials, each resonator unit is in an integrated I shape, and an included angle smaller than 90 degrees is formed between each resonator unit and the X-axis direction of the horizontal plane. The continuous graphene layer is formed by arranging single-layer carbon atoms; the vanadium dioxide resonator array is attached to the upper surface of the continuous graphite layer. The Topas dielectric layer is positioned below the continuous graphene layer. The metal layer is located below the Topas dielectric layer. The device overcomes the defects that a traditional metamaterial absorber is poor in tunability, single in function and insufficient in performance index.

Description

technical field [0001] The invention relates to the field of electromagnetic metamaterials, in particular to a graphene-vanadium dioxide metamaterial absorber and a tunable terahertz device. Background technique [0002] Metamaterials (MMs) are artificial composite materials composed of periodically arranged subwavelength units, which have extraordinary electromagnetic properties that natural materials do not possess, such as negative refractive index, electromagnetically induced transparency (EIT), inverse Doppler Le effect, etc. In recent years, due to these special electromagnetic properties, metamaterials have gradually become a research hotspot, and have broad application prospects in the fields of biological imaging, electromagnetic stealth, perfect lens and wireless communication. In 2008, Landy et al. proposed an absorber based on electromagnetic metamaterials, which achieved perfect absorption of specific electromagnetic waves for the first time. Since then, resea...

Claims

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Application Information

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IPC IPC(8): H01Q15/00H01Q17/00
CPCH01Q15/0086H01Q17/007
Inventor 王鑫王俊林刘苏雅拉图
Owner INNER MONGOLIA UNIVERSITY
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