Dual-band terahertz wave absorber of graphene metasurface

A wave absorber and metasurface technology, applied in the terahertz field, can solve problems such as large structure size, low absorption rate, and complex structure, and achieve good absorption effect, simple structure, and easy realization

Pending Publication Date: 2020-02-28
ANYANG NORMAL UNIV
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Problems solved by technology

However, the existing ones generally have disadvantages such as complex struct

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  • Dual-band terahertz wave absorber of graphene metasurface
  • Dual-band terahertz wave absorber of graphene metasurface
  • Dual-band terahertz wave absorber of graphene metasurface

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[0021] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0022] Such as Figure 1~3 As shown, a graphene super-surface dual-band terahertz wave absorber includes a plurality of wave absorbing units continuously arranged along a plane. The absorber unit is composed of bottom metal film (1), middle dielectric layer (2) and top graphene film (3) arranged from bottom to top, bottom metal film (1), middle dielectric layer (2) and top layer The graphene films (3) are attached to each other. The bottom metal film (1) is an all-metal film, the top graphene film (3) is a patterned single-layer graphene, the geometric center of the patterned single-layer graphene and the geometric center of the intermediate dielectric layer (2) And the geometric center of the underlying metal film (1) is on a straight line.

[0023] When multiple absorbing units are continuously arranged along the plane, the bottom metal film 1 and...

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Abstract

The invention provides a dual-band terahertz wave absorber of a graphene metasurface. The metasurface wave absorber is composed of a plurality of wave absorber units, each wave absorber unit is composed of a bottom-layer metal film (1), a middle dielectric layer (2) and a top-layer graphene film (3) which are sequentially arranged from bottom to top, and the bottom-layer metal film (1), the middledielectric layer (2) and the top-layer graphene film (3) are attached to one another; the bottom-layer metal film (1) is an all-metal film, the top-layer graphene film (3) is patterned single-layer graphene, and the geometric center of the patterned single-layer graphene, the geometric center of the middle dielectric layer (2) and the geometric center of the bottom-layer metal film (1) are on thesame straight line. The metasurface wave absorber has the advantages of high absorptivity, wide incident angle, insensitive polarization and the like.

Description

technical field [0001] The invention relates to the technical field of terahertz, in particular to a graphene metasurface dual-band terahertz absorber. Background technique [0002] Terahertz waves are electromagnetic waves in the spectral range between the microwave and infrared bands. Terahertz waves have some unique properties: 1. Terahertz waves, like microwaves, have strong penetrating power to many non-polar substances, such as cardboard boxes, plastics and cloth, so terahertz waves can detect hidden objects; 2. The wavelength of the Hertzian wave is shorter than that of the microwave, so that the terahertz wave has a higher spatial resolution in imaging; third, the photon energy of the terahertz wave is relatively low (1THz~4meV) and will not cause damage to biological tissues. Compared with terahertz waves, the photon energy of X-rays is in the keV range, which may cause genetic damage and skin cancer to biological tissues. 4. Since the vibration and rotation energ...

Claims

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Application Information

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IPC IPC(8): G02B5/00
CPCG02B5/003
Inventor 胡丹王红燕朱巧芬
Owner ANYANG NORMAL UNIV
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