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Graphene-based dual-band terahertz (THz) microwave absorber

A graphene, dual-band technology, applied in the field of terahertz wave absorbers, can solve the problems of large imaginary part of metal dielectric constant, difficult to achieve tunability, limited surface plasmon application, etc., to achieve simple and compact structure, convenient The effect of large-scale integration and efficient absorption

Inactive Publication Date: 2018-01-05
CHINA JILIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The position of the absorption peak and the absorption efficiency are adjusted by adjusting the size of the unit structure, so it is difficult to achieve tunability once it is fixed in the experiment
In the terahertz band, the imaginary part of the dielectric constant of metals, which are commonly used surface plasmon materials, is very large, so they cannot directly support surface plasmons, which also limits the application of surface plasmons in terahertz wave absorption.

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  • Graphene-based dual-band terahertz (THz) microwave absorber

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Embodiment Construction

[0021] figure 1 A graphene-based dual-band terahertz absorber. Its composition is based on gold with a period of P and a thickness of t as a reflective substrate, a layer of silicon dioxide dielectric with a thickness of d is superimposed on the gold, and its dielectric constant is set to 4, and a layer of silicon dioxide with a thickness of h is superimposed on the silicon dioxide. Polymethyl methacrylate, its dielectric constant is set to 2.3, a layer of graphene strips with a width of w is superimposed on the polymethyl methacrylate as an absorbing layer, and its thickness is g, and a layer of graphene is superimposed on the graphene An aluminum oxide strip of thickness b with a dielectric constant of 3.5 and a top layer of metallic material gold of thickness m. The thickness of gold here is much greater than the skin depth of gold in the terahertz band, so the gold material here can be regarded as PEC.

[0022] One of the most important properties of graphene is electric...

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Abstract

The invention discloses a graphene-based dual-band terahertz (THz) microwave absorber, which belongs to microwave absorbers in the technical field of terahertz and utilizes the surface plasmon characteristics of graphene. The wave absorber is a two-dimensional periodic structure and has the following structural components: a metal strip (1) made of gold, an aluminum dioxide dielectric layer (2), agraphene absorber layer (3), a polymethylmethacrylate (PMMA) dielectric layer (4), a silicon dioxide substrate layer (5), and a bottom metal reflective layer (6). The absorption spectrum of the terahertz wave is simulated and calculated by a finite element method. The structure of the wave absorber is optimized and the ideal absorption effect is obtained. The wave absorber has the advantages of simple structure and easy processing; and because of the special optical property of graphene, the absorption peak position can be adjusted by doping.

Description

technical field [0001] The invention relates to a graphene-based dual-band terahertz wave absorber, which belongs to the application field of graphene materials in the terahertz wave band. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency between 0.1THz and 10THz, between millimeter waves and infrared rays, and have some characteristics of these two bands at the same time. With the application of terahertz technology in communication, imaging, sensing, etc., people have paid great attention to terahertz technology. At present, there are few materials in nature that can be applied to this wave band, mainly due to the lack of effective terahertz sources and detectors. In recent years, in order to improve the detection efficiency and sensitivity of terahertz detectors, researchers have begun to absorb terahertz waves The study of materials is placed in a crucial position, among which the research of terahertz absorbing materials base...

Claims

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Application Information

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IPC IPC(8): G02B5/00H01Q17/00
Inventor 肖丙刚古明月
Owner CHINA JILIANG UNIV
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