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Graphene-based broadband-adjustable terahertz wave absorber

A terahertz, graphene technology, applied in electrical components, antennas and other directions to achieve the effect of widening the working bandwidth, simple structure and good flexibility

Pending Publication Date: 2021-07-27
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the technical problems existing in the prior art, the present invention provides a graphene-based broadband adjustable terahertz absorber to solve the problem that the existing metamaterial absorber has a narrow bandwidth and is fixed, which cannot satisfy Flexible microwave absorption requirements in multiple scenarios

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Embodiment

[0040] as attached Figure 1-4 As mentioned above, this embodiment provides a graphene-based broadband tunable terahertz absorber, including a top layer 1, a first dielectric layer 2, an intermediate layer 3, a second dielectric layer 4, and a bottom substrate 5; the top layer 1, The first dielectric layer 2 , the middle layer 3 , the second dielectric layer 4 and the bottom substrate 5 are aligned in sequence from top to bottom; wherein, the top layer 1 and the middle layer 3 are graphene layers.

[0041] A first conductive contact is provided between the top layer 1 and the bottom substrate 5, and a second conductive contact is provided between the middle layer 3 and the bottom substrate 5; the first conductive contact and the second conductive contact are respectively used to apply the grid Voltage; the chemical potential of the top layer 1 passes the bias voltage V between the top layer 1 and the bottom substrate 5 g control, the chemical potential of the intermediate lay...

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Abstract

The invention discloses a broadband adjustable terahertz wave absorber based on graphene. The broadband adjustable terahertz wave absorber comprises a top layer, a first dielectric layer, a middle layer, a second dielectric layer and a bottom layer substrate which are sequentially arranged from top to bottom. The top layer and the middle layer are both graphene layers, wherein the absorption peaks of incident waves are crossed and overlapped when the top layer and the middle layer reach resonance; the chemical potential of the top layer is regulated and controlled through a bias voltage Vg between the top layer and the bottom layer substrate, and the chemical potential of the middle layer is regulated and controlled through a bias voltage Vs between the middle layer and the bottom layer substrate. According to the invention, the top layer and the middle layer are arranged and are both graphene layers, so that good impedance matching is realized; absorption peaks of incident waves are crossed and overlapped when the top layer and the middle layer achieve resonance, so that the working bandwidth is effectively widened; the chemical potential of the graphene layer is dynamically regulated and controlled through bias voltage, and the dynamic regulation effect of the wave absorbing amplitude of the wave absorber is achieved; the broadband adjustable terahertz wave absorber is simple in structure, small in size, perfect in absorption effect and good in flexibility.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave absorbing equipment, in particular to a graphene-based broadband adjustable terahertz absorber. Background technique [0002] With the wide application of absorbers in the fields of stealth technology, wireless security and terahertz communication, higher requirements are put forward for the bandwidth, size and flexibility of absorbers; and metamaterial absorbers are a sub-wavelength The absorbing structure has many advantages such as high absorption rate, thin thickness and designable electromagnetic properties. The metamaterial absorber improves the sensitivity of terahertz functional devices. However, due to the resonance mechanism of the metamaterial absorber itself, most absorbers have a narrow structural bandwidth, and once processed, their performance is also fixed, which cannot meet the needs of flexible absorbing in multiple scenarios. Contents of the invention [0003] Ai...

Claims

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Application Information

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IPC IPC(8): H01Q17/00H01Q15/14
CPCH01Q17/00H01Q15/14
Inventor 陈娟靳书珍
Owner XI AN JIAOTONG UNIV
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