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A graphene-based terahertz dual-band tunable absorber

A graphene and wave absorber technology, which is applied in the field of terahertz metamaterial wave absorption, can solve problems such as hindering practical application and combination difficulties, and achieve the effects of easy large-scale integration, simple and compact structure, and simple structure.

Active Publication Date: 2021-04-23
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

Although multi-band or broadband and tunable absorption behavior are highly desirable, combining these two properties is a very difficult task, which greatly hinders their practical application

Method used

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  • A graphene-based terahertz dual-band tunable absorber
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  • A graphene-based terahertz dual-band tunable absorber

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specific Embodiment approach

[0025] The present invention designs a graphene-based terahertz dual-band adjustable absorber, and the specific implementation method includes:

[0026] figure 1 Schematic diagram of a graphene-based dual-band absorber. The metal layer 1 with a period of p and a thickness of t1 is used as the reflective substrate, the intermediate dielectric layer 2 is made of silicon dioxide, the top layer of graphene layer 3 is a single-layer structure, the horizontal period and the vertical period are both p, and the radius of the circular graphene is R, monolayer graphene thickness is 1 nm. The metal layer can be a good conductor such as gold or silver, where the thickness of the metal should be much greater than its skin depth in the terahertz band, and 0.2 μm is selected as its thickness.

[0027] The present invention designs a reflective wave absorber at 2-10 THz, so the selected period p is 3 μm.

[0028] figure 2 It is the top graphene graph, the radius of the circular graphene ...

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Abstract

The invention discloses a graphene-based terahertz dual-band adjustable wave absorber, which belongs to the field of terahertz metamaterial wave absorption, and realizes perfect absorption in the terahertz dual-band. In addition, changing the chemical potential of graphene can change its absorbing frequency band. The wave absorber unit designed by the present invention includes a layer of all-metal film (1) from bottom to top, a layer of dielectric film (2), the top layer is a patterned single-layer graphene (3), and the three-layer structure is attached to each other. combine. Wherein the metal thin film layer uses conductors such as gold or silver, and the intermediate dielectric layer uses silicon dioxide. Through the finite element method simulation calculation, the reflection spectrum of the structure is observed, and the perfect absorption in the terahertz dual-band is realized. The metasurface absorber has the advantages of strong absorption, polarization insensitivity, simple structure, and easy processing. Due to the adjustable Fermi level of graphene, the performance of dynamically adjustable resonant frequency of the absorber can be realized, which can meet Requirements for applications in terahertz absorption.

Description

[0001] (1) Technical field [0002] The invention designs a graphene-based terahertz dual-band adjustable wave absorber, which belongs to the field of terahertz metamaterial wave absorption. The structure of the absorber can realize dual-band absorbing, adjustable absorbing frequency band, polarization insensitivity and other characteristics, and can be used in terahertz band light source, sensor design and other aspects. [0003] (2) Background technology [0004] Metamaterial perfect absorbers (MPAs) with subwavelength scales have attracted widespread interest. Currently MPAs have been widely studied and applied in bolometers, chemical and biomedical sensing, photodetectors, photothermal conversion, etc., and many types of MPAs have been proposed. One of the hottest research directions in this field is to realize tunable MPAs because of their great flexibility in practical applications. Currently, most designs focus on absorbing intensity modulation rather than resonant fre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00
CPCH01Q17/00
Inventor 陈明陈晨刘厚权王崇云赵德平高文文张文波苑立波
Owner GUILIN UNIV OF ELECTRONIC TECH
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