Multifunctional device based on VO2 and graphene mixed metamaterial

A multifunctional, metamaterial technology, applied in the direction of instruments, optical components, polarizing components, etc., can solve problems such as structural application limitations

Active Publication Date: 2019-11-12
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These proposed structures can only be tuned by changing the geometric parameters of the structures, making the applications of the structures limited and requiring active control of the spectral response

Method used

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  • Multifunctional device based on VO2 and graphene mixed metamaterial
  • Multifunctional device based on VO2 and graphene mixed metamaterial
  • Multifunctional device based on VO2 and graphene mixed metamaterial

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0030] It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second" and ...

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Abstract

The invention discloses a multifunctional device based on a VO2 and graphene mixed metamaterial, and relates to the technical field of photoelectricity. The device comprises a plurality of unit structures, wherein each unit structure comprises a vanadium dioxide layer, a graphene layer, a dielectric layer and a metal reflection layer, wherein the dielectric layer is arranged at the upper end of the metal reflection layer; the graphene layer is arranged at the upper end of the dielectric layer; a groove is arranged in the graphene layer; the groove extends into the dielectric layer; the vanadium dioxide layer is arranged at the upper end of the bottom of the groove; a dielectric layer region is reserved between the vanadium dioxide layer and the graphene layer; electromagnetic wave polarization conversion is carried out by adjusting the Fermi level of the graphene layer in order to realize functional shift of the multifunctional device between a perfect absorber and a polarization converter; the multifunctional device can work in a high-temperature environment, the absorption effect of the absorber on the electromagnetic wave cannot be weakened along with the increase of the temperature, and instead the absorption effect can be enhanced; and the polarization converter has the advantages of being ultra-thin, wide in frequency band, high in efficiency and the like.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a VO-based 2 and graphene hybrid metamaterials for multifunctional devices. Background technique [0002] Mid-infrared devices have attracted increasing attention due to their unique properties in the mid-infrared region, which has similarities to the terahertz range. At present, perfect absorbers and polarization converters have become research hotspots in the mid-infrared band. As two important branches of optical devices, broadband absorbers and polarization converters have important applications in imaging devices, thermal emitters, sensors, modulators, and camouflage devices. [0003] However, conventional broadband perfect absorbers and polarization converters are realized by stacks of ultraplanar films consisting of alternating layers of metal / dielectric films with a total thickness much larger than the operating wavelength. These bulky designs obviously go agai...

Claims

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Application Information

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IPC IPC(8): G02B5/00G02B5/30G02B1/00
CPCG02B1/002G02B5/003G02B5/30
Inventor 韦中超毛敏
Owner SOUTH CHINA NORMAL UNIVERSITY
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