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Novel adjustable terahertz metamaterial absorbing structure

A metamaterial and terahertz technology, applied in antennas, electrical components, etc., can solve the problems of inflexible adjustment and inconvenient preparation of metamaterials, and achieve the effect of uniform deformation

Active Publication Date: 2019-04-19
HUAZHONG UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide a new type of adjustable terahertz metamaterial absorbing structure, wherein through the overall composition of the metamaterial absorbing structure, especially for the key metamaterial The improvement of the control principle (that is, the corresponding terahertz wave attraction control principle) and its corresponding components can effectively solve the problems of inconvenient preparation and inflexible adjustment of metamaterials compared with the existing technology, and the metamaterial wave-absorbing structure can Used in conjunction with the new integrated air pressure modulation method, it is easy to integrate and has high repeatability, and the deformation of metamaterials is also very uniform, and the control effect is good

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  • Novel adjustable terahertz metamaterial absorbing structure

Examples

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Effect test

example 1

[0037] Generally speaking, the present invention presents a structure combining a new type of integrated air pressure modulation method and a metamaterial absorber. The realization scheme is to change the geometric parameters of the metamaterial structure by changing the pressure in the cavity, and then realize the absorption of the incident terahertz wave. rate modulation.

[0038] The structure can be divided into two parts. Such as figure 1 As shown, the upper part is a dielectric thin film and a metal periodic array structure. The lower part is to use the medium as the substrate, and use related processes to prepare a periodic array of square holes with the same specifications on the surface of the medium substrate, and lay a metal layer on the bottom of the square holes, and these square hole structures are consistent with the two-dimensional metal layer structure on the top of the metamaterial. Corresponding to the location, the specific structure is as follows figur...

example 2

[0043] The cell structure of Example 2 is as Image 6 shown. The metal array is above the dielectric film, the outer layer is a metal frame with gaps, the inner layer is an I-shaped structure, and the thickness of the air cavity is t AIR =2um, bottom metal thickness t AU = 0.85um. In this example, the material of the dielectric film is PDMS, and the thickness t PDMS =2um, relative permittivity is 2.75, loss tangent is 0.05; metal material is copper, thickness t CU =0.85um, the conductivity is 5.81e7S / m. The specific parameters of the structure are as Figure 7 As shown, the period length of the structure is L=66.7um, the metal array square side length L1=53.3um, the line width w=5um, the spacing d=5.4um, and the slit width g=3.4um.

[0044] During modulation, when the pressure of 20KPa and 40KPa is added to the air cavity, the final simulation results are as follows Figure 8 shown. It can be seen that when the PDMS film and the metal array are deformed upward due to t...

example 3

[0046] The unit structure of Example 3 is as Figure 9 shown. The metal array of this structure is under the dielectric film and is composed of two nested square frames with slits inside the air cavity. The cavity thickness of the air cavity is t AIR =3um, bottom metal thickness t AU = 0.85um. In this example, the material of the dielectric film is PDMS, the thickness t PDMS =2um; the material of the metal is gold, and the thickness is t AU = 0.85um. The specific parameters of the structure are as Figure 10 As shown, the period length of the structure is L=66.7um, the metal array square side length L1=53.3um, the line width w=5um, the spacing d=5.4um, and the slit width g=3.4um.

[0047] When the reverse 4KPa and 8KPa pressures are added to the air cavity, the final simulation results are as follows Figure 11 shown. The dielectric film and metal array are deformed downward due to the downward pressure. For the two absorption peaks in this structure, when the struct...

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Abstract

The invention discloses an adjustable terahertz metamaterial absorbing structure. The structure comprises a dielectric material substrate and metamaterial units distributed on the substrate, any one metamaterial unit comprises a pair of bottom metal layers correspondingly arranged and a super material array, the super material array is fixedly arranged on a flexible dielectric film, a cavity is formed between the flexible dielectric film and the bottom metal layers, the pressure of the cavity is regulated to achieve the regulation and control of the whole supper material absorbing structure for the terahertz absorbing. Through the whole formation of the supper material absorbing structure, special improvement for the key super material regulation and control principle (namely a corresponding) terahertz wave attraction control principle and the related corresponding components, the problems can be solved that the supper material is not convenient to prepare and not flexible in regulation compared to the prior art.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing structures, and more specifically relates to a novel adjustable terahertz metamaterial wave-absorbing structure. Background technique [0002] Metamaterials are a new type of periodic man-made composite materials. By designing the structural parameters of metamaterials, excellent electromagnetic properties that are not available in natural materials can be obtained. Metamaterials can generate extremely strong electrical or magnetic coupling to incident electromagnetic waves, thus exhibiting some unique properties, such as negative refractive index, subwavelength focusing, perfect absorption, etc. Metamaterials are generally composed of metal structures embedded on an insulating substrate and designed as subwavelength periodic arrays. There is also a metal layer at the bottom of the structure of the metamaterial as an absorber. At the resonant frequency, the structure produces a Strong coup...

Claims

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Application Information

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IPC IPC(8): H01Q17/00
CPCH01Q17/007
Inventor 余洪斌苏欣李琦李威冯楚桓张欣峰熊晗曾扬舰周航范甜甜邵健朱业锦石樊
Owner HUAZHONG UNIV OF SCI & TECH
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