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Single-layer broadband amplitude coding metasurface for total-space holographic imaging

A technology of amplitude coding and holographic imaging, applied in the field of coding metasurfaces, can solve the problems of narrow working frequency band and large number of cascaded layers, and achieve the effect of wide working frequency band and few structural layers

Pending Publication Date: 2021-08-13
QIQIHAR UNIVERSITY
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Problems solved by technology

[0006] The present invention aims to solve the problems of many cascaded layers and narrow working frequency band in the existing coded metasurface in the aspect of full-space regulation of electromagnetic waves, and now provides a single-layer wide-band amplitude coded metasurface for full-space holographic imaging

Method used

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  • Single-layer broadband amplitude coding metasurface for total-space holographic imaging
  • Single-layer broadband amplitude coding metasurface for total-space holographic imaging
  • Single-layer broadband amplitude coding metasurface for total-space holographic imaging

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specific Embodiment approach 1

[0025] Specific Embodiment 1: Based on digital coding technology, using the degree of freedom of polarization and working mode, this embodiment proposes a broadband amplitude coding metasurface structure that can realize holographic imaging functions in both transmission and reflection spaces. refer to Figure 1 to Figure 3 This embodiment is specifically described. A single-layer broadband amplitude coding metasurface for full-space holographic imaging described in this embodiment includes a plurality of metasurface units arranged in an array, and each metasurface unit includes: Coding unit and rectangular dielectric layer 2. The dielectric constant of the dielectric layer 2 is 3.5, and the loss tangent is 0.001. The thickness of the dielectric layer 2 is 2 mm. In a specific application, the surface of the dielectric layer 2 is a square, and the side length of the square is P x =P y = 10 mm.

[0026] The coding unit includes a cross-shaped metal layer 1 on the upper surf...

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Abstract

The invention discloses a single-layer broadband amplitude coding metasurface for total-space holographic imaging, and relates to the technical field of coding metasurfaces. The invention aims to solve the problem that the existing coding metasurface has a large number of cascade layers and a narrow working band in the aspect of full-space electromagnetic wave regulation and control. A coding unit comprises a cross-shaped metal layer and a rectangular metal layer. Metal strips of the cross-shaped metal layer are provided with strip-shaped gaps in the length direction, and the middle points of the two metal strips intersect to form a cross shape. The rectangular metal layer can cover the lower surface of a dielectric layer, and the rectangular metal layer is provided with a rectangular annular hollow structure. The midpoints of two opposite sides of the hollow structure are communicated through a strip-shaped opening. The geometric centers of the cross-shaped metal layer, the rectangular metal layer and the dielectric layer are overlapped.

Description

technical field [0001] The invention belongs to the technical field of coded metasurfaces. Background technique [0002] Metamaterials are a class of artificial materials with special properties. They have some special properties, such as allowing light and electromagnetic waves to change their usual properties, and such effects cannot be achieved by natural materials and traditional materials. Therefore, due to their special properties, metamaterials The electromagnetic properties have received extensive attention. However, due to the complex structure of metamaterials and the difficulty of processing and manufacturing, they are not suitable for practical applications, and their application prospects are severely limited. [0003] Metasurfaces are the two-dimensional counterparts of metamaterials, capable of arbitrarily controlling the amplitude, phase, and polarization of electromagnetic waves. This kind of metasurface can customize arbitrary wavefronts with subwavelengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00
CPCH01Q15/0086
Inventor 朱磊董亮周文娟
Owner QIQIHAR UNIVERSITY
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