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A Tunable Terahertz Metamaterial Absorber

A technology of metamaterials and absorbers, applied in the field of terahertz, can solve the problems of complex tuning structure design, terahertz metamaterial absorber can only be adjusted passively, and difficult production, so as to achieve structural parameter optimization, increase flexibility and low cost Effect

Active Publication Date: 2021-07-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a tunable terahertz metamaterial absorber. By designing the structure of the metamaterial layer on the surface of the absorber, the absorber can realize tunable functions. The tuning method The switch between the two absorption peaks is achieved by changing the absorption mode of the surface metamaterial layer, which solves the problem that the existing terahertz metamaterial absorber can only be adjusted passively, and at the same time solves the problem of complex design and difficult fabrication of traditional tuning structures

Method used

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  • A Tunable Terahertz Metamaterial Absorber
  • A Tunable Terahertz Metamaterial Absorber
  • A Tunable Terahertz Metamaterial Absorber

Examples

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Embodiment 1

[0030] Such as figure 1 As shown, the tunable terahertz metamaterial absorber of the present invention is composed of several cuboid structural units 5 arranged periodically. Such as figure 2 As shown, the structural unit 5 includes a stacked three-layer structure: a surface metamaterial layer, an intermediate dielectric layer 3 and a metal bottom layer 4 . The surface metamaterial layer includes a metal pattern 1 symmetrically etched on the intermediate dielectric layer 3. The metal pattern 1 has a symmetrical structure both horizontally and vertically. The metal pattern 1 includes a long metal strip, and the long metal strip is connected to the unopened end of the split ring structure. , in this embodiment, it is preferably a square split ring structure; an adjustable material strip 2 is inlaid between the other ends of the split ring structure. Metal patterns 1 are sequentially connected to metal patterns 1 on adjacent structural units 5 through long metal strips, so tha...

Embodiment 2

[0049] Compared with Embodiment 1, the present embodiment has made the following changes:

[0050] The adjustable material strip 2 adopts a variable conductivity material, specifically a metal phase vanadium dioxide or a graphene material whose conductivity varies with voltage, and is preferably a graphene material in the present embodiment; specific embodiments are as follows Figure 5 As shown, a bias voltage is added to both sides of the adjustable material strip 2, and the chemical potential of graphene is adjusted by changing the voltage, so that its Fermi energy level changes, and then the conductivity of graphene is changed, that is, the controllable The adjustment of the equivalent conductivity of the material strip 2 further changes the absorption characteristics of the metamaterial absorber to achieve a tuning effect.

Embodiment 3

[0052] Compared with Embodiment 2, the present embodiment has made the following changes:

[0053] The adjustable material strip 2 adopts a material with variable conductivity, specifically a doped silicon, gallium arsenide or cadmium sulfide photosensitive material whose conductivity changes with light intensity, preferably a doped gallium arsenide material in this embodiment; An external bias voltage is required, and the equivalent conductivity can be adjusted only by changing the external light intensity of the absorber, and the absorption characteristics of the metamaterial absorber can be changed to achieve a tuning effect, which is simple and convenient.

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Abstract

The invention provides a tunable terahertz metamaterial absorber, which belongs to the field of terahertz technology. The absorber is composed of several structural units arranged periodically, and the structural units include surface metamaterial layers stacked together from top to bottom, The intermediate dielectric layer and the metal bottom layer; the surface metamaterial layer is composed of metal patterns and adjustable material strips. The adjustable material strips are designed as semiconductor materials or materials with variable conductivity. The adjustable material strips can be changed by voltage regulation or external light intensity. The electrical conductivity of the absorber realizes the change of the absorption mode of the absorber, and then realizes the switching of the two absorption peaks, solves the problem that the existing terahertz metamaterial absorber can only be tuned passively, and realizes active tuning; at the same time, due to the principle of the two absorption modes The present invention has the outstanding advantage of being simple and easy to optimize the structural parameters.

Description

technical field [0001] The invention belongs to the technical field of terahertz, and in particular relates to a tunable terahertz metamaterial absorber. Background technique [0002] The wave band of terahertz wave is between the millimeter wave band and the far-infrared wave band, specifically refers to electromagnetic waves with a frequency of 0.1-10THz and a wavelength of 3-0.03mm. The "terahertz gap" of the spectrum, which cannot be addressed using either optical theory or microwave theory alone. Therefore, before the 1980s, there were few studies on terahertz waves, and the processing of electromagnetic waves in this band was not perfect in the prior art, and it was difficult to deal with terahertz waves effectively. [0003] In recent years, due to its high penetrability, low photon energy, and high bandwidth, terahertz waves have gradually shown great application value in national defense security, astronomical observation, and wireless communication. It is worth n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00H01Q15/00
CPCH01Q15/0086H01Q17/007
Inventor 杨磊王淏任旭东刘珅驿高鹤
Owner JIANGSU UNIV
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