Reflection type circular polarization plane metalens on basis of graphene metasurfaces

A graphene and metasurface technology, applied in mirrors, optics, instruments, etc., can solve the problems of low practical value, low transmittance of metalenses, low efficiency of metal nanoantenna metasurface working mode, etc.

Active Publication Date: 2018-11-13
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, in the field of metalenses, the working mode efficiency of metal nanoantenna metasurfaces is very low due to the loss of the metal itself.
When metallic nanohole metasurfaces are used for transmissive metalens, the transmission of the metalens is very low (10 -2 order of magnitude), only has certain research value, and the practical value is not high
In addition, the structural parameters of the existing metalens are determined, and their converging focal length for fixed-frequency electromagnetic waves is fixed, that is to say, the existing metalens cannot perform continuous zooming operations for fixed-frequency incident waves

Method used

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  • Reflection type circular polarization plane metalens on basis of graphene metasurfaces
  • Reflection type circular polarization plane metalens on basis of graphene metasurfaces
  • Reflection type circular polarization plane metalens on basis of graphene metasurfaces

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Embodiment 1

[0060] Such as image 3 -(a) shows a schematic diagram of a reflective circularly polarized planar metalens embodiment based on a graphene metasurface of the present invention, including a graphene metasurface layer 1 distributed with a rectangular hole array, a dielectric layer 2 (here Specific use of SiO 2 Dielectric layer), metal base layer 3, applying a bias voltage V between the metal base layer and the graphene supersurface layer can adjust the Fermi energy of graphene. SiO 2 The thickness of the dielectric layer is 8.5um. The rectangular hole matrix of the graphene supersurface layer is set as follows, and the rotation angles of any column of rectangular holes along the y-axis direction are set to the same size. Such as image 3 -(b) shows the schematic diagram of the unit structure of the graphene metasurface of the embodiment, the width (a=2.5um) and the arrangement period (c=8um) of the rectangular graphene holes forming the array are constant, the length of the ...

Embodiment 2

[0091] The metasurface lens of Example 1 has the property that the focal length decreases as the chemical potential of graphene increases. According to the same principle, when the length distribution of graphene rectangular holes is opposite, that is, along the x-axis direction, from the center of the lens to both sides, when the length b of the graphene holes gradually increases, the focal length can be realized as the chemical potential of graphene increases. Large hyperlens. Figure 10 -(a) Give the length b and rotation angle of the graphene hole in the metasurface lens structure The distribution along the x-axis direction in the x-y plane, the corresponding simulation results of the reflected wave focusing of the metalens are as follows Figure 10 -shown in (b). Depend on Figure 10 -(b), when the graphene chemical potential increases from 0.7eV to 1.1eV, the focal length of the metasurface lens increases from F=140um to 170um, and the tuning range of the focal lengt...

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Abstract

The invention relates to a reflection type circular polarization plane metalens on the basis of graphene metasurfaces, and belongs to the field of novel artificial electromagnetic materials and optical devices. The reflection type circular polarization plane metalens comprises a lower metal substrate layer, a middle dielectric layer and controllable bias voltage devices. A graphene metasurface layer with rectangular pore arrays is arranged on the upper metal substrate layer and is used for controlling polarization directions and propagation characteristics of reflected waves, and the controllable bias voltage devices are connected with the graphene metasurfaces and metal substrates, so that Fermi energy of the graphene metasurface layer can be adjusted, the electric conductivity of graphene layers can be changed, and the focal length of the reflection type circular polarization plane metalens which is a graphene metalens can be dynamically tuned. Compared with transmission type metal metasurface lenses with excessively low transmission efficiency, the reflection type circular polarization plane metalens has the advantages that the reflection type circular polarization plane metalens is suitable to be applied to actual scenes; focusing locations are flexible and controllable, and accordingly the reflection type circular polarization plane metalens is high in practicality; the requirements of certain distribution laws can be met by rotation angles of rectangular pores in the reflection type circular polarization plane metalens and the lengths of the rectangular pores, and fixed-frequency electromagnetic wave focal lengths can be regulated and controlled.

Description

technical field [0001] The invention relates to a reflective circularly polarized plane superlens based on a graphene metasurface, which belongs to the field of novel artificial electromagnetic materials and optical devices. Background technique [0002] Metamaterials (metamaterials) is a general term for new artificial electromagnetic media with extraordinary physical properties that natural media do not possess. It is usually arranged periodically by sub-wavelength metal or dielectric units capable of electrical and magnetic responses. Its macroscopic electromagnetic properties Different from conventional materials, it has many new properties that natural materials do not have. Metasurface is an ultra-thin two-dimensional array plane constructed of metamaterial structural units, which not only retains the singular properties of three-dimensional metamaterials, but also overcomes the difficulties faced in the preparation of three-dimensional metamaterials. By adjusting the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00G02B5/08
CPCG02B1/002G02B5/08
Inventor 丁佩李艳邵立许坤付林杰曾凡光
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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