Broadband adjustable terahertz wave absorber based on graphene

A terahertz and graphene technology, applied in the terahertz field, can solve the problems of limiting the practical application of the terahertz field and the narrow bandwidth of incident electromagnetic waves, and achieve the effect of simple structure and easy implementation.

Pending Publication Date: 2020-01-07
ANYANG NORMAL UNIV
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Problems solved by technology

However, most current graphene-based absorbers use periodic independent disks, cross-shaped, strip-shaped or other graphene arrays, resulting in a narrow bandwidth for perfect absorption of incident electromagnetic w

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  • Broadband adjustable terahertz wave absorber based on graphene
  • Broadband adjustable terahertz wave absorber based on graphene
  • Broadband adjustable terahertz wave absorber based on graphene

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[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] see figure 1 , figure 1 It is a schematic diagram of the unit structure of the absorber. As shown in the figure, a graphene-based broadband tunable terahertz absorber uses metal 1 as the reflective substrate, and the structure is followed by an insulating dielectric layer 2 and a graphene layer 3. , the graphene layer is composed of a periodic single-layer graphene square sheet structure. Gold with high conductivity is used as the structural substrate to realize a completely reflective structure. The thickness of gold is greater than 100 nanometers (greater than the skin depth), and the reflection loss of the gold film in the terahertz band is very small. It can be regarded as a perfect electrical conductor (PEC) in the simulation. . figure 2 A top view of the top graphene layer. The graphene layer on the top layer is a pe...

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Abstract

The invention discloses a broadband adjustable terahertz wave absorber based on grapheme. Metal is used as a reflecting substrate, an insulating dielectric layer and a graphene layer are sequentiallyarranged upwards in structure, and the graphene layer is composed of a regular single-layer graphene square sheet structure. Because the graphene shows strong metallicity in infrared and terahertz bands, the graphene structure is directly used as a resonance structure unit, and local surface plasma resonance is combined with surface plasma resonance of the graphene structure to realize the broadband wave absorber with a single-layer structure, so that the processing technology of the structure is greatly simplified. Due to the unique electrical characteristics of the graphene, the chemical potential and the surface conductivity of the graphene can be changed through change of the external bias voltage, so that the broadband strong absorption of incident terahertz waves is adjusted in a wide range. The terahertz wave absorber is simple in structure and high in absorption efficiency, and has important application prospects in the fields of terahertz imaging, spectra, invisibility and thelike.

Description

technical field [0001] The invention relates to the technical field of terahertz, in particular to a graphene-based broadband adjustable terahertz wave absorber. The absorber structure can realize the characteristics of broadband absorption, wide-range adjustment of absorption rate of broadband terahertz wave, wide-angle broadband absorption and polarization unknown. It can be used for terahertz detection in terahertz band, terahertz imaging, and Hertz stealth and so on. Background technique [0002] Terahertz (Terahertz) waves generally refer to electromagnetic waves with a frequency in the range of 0.1 to 10 THz, between the infrared band and the microwave band, and in the cross-field of electronics and photonics research. Terahertz waves have unique properties such as broadband, low energy, and coherence, making them have great application prospects in medical imaging, sensor detection, security inspection, radar, and communications. At present, terahertz wave generatio...

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Application Information

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IPC IPC(8): G02B5/00
CPCG02B5/003
Inventor 胡丹张进峰刘丹
Owner ANYANG NORMAL UNIV
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