Method for realizing tunable electromagnetic induction transparency based on graphene-medium composite metasurface

An electromagnetic induction transparent, graphene technology, applied in electrical components, antennas, instruments, etc., can solve the problem of low transmittance and quality factors of EIT windows, and achieve the effect of excellent electromagnetic performance and high transmittance

Active Publication Date: 2021-08-13
ZHEJIANG UNIV OF TECH
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Problems solved by technology

However, since this method uses metal plasma materials to construct metamaterials, and the non-radiative loss caused by metal ohmic damping is unavoidable, the transmittance and quality factor of the EIT window obtained in this way are not high.

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  • Method for realizing tunable electromagnetic induction transparency based on graphene-medium composite metasurface
  • Method for realizing tunable electromagnetic induction transparency based on graphene-medium composite metasurface
  • Method for realizing tunable electromagnetic induction transparency based on graphene-medium composite metasurface

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Embodiment approach 1

[0033] Embodiment 1: In this embodiment, a feasible and excellent embodiment obtained after design and optimization by the electromagnetic simulation software CST is: p=1500nm, d=530nm, r0=190nm, r1=130nm, h=190nm. The substrate material is quartz, with a dielectric constant of 2.19. The material of the cylindrical nanocolumn and the hollow cylindrical nanocolumn is silicon, and the dielectric constant is 14. The graphene layer selects single-layer graphene. When the above conditions are fixed, the best results can be obtained when the Fermi level is adjusted to 0.6 eV. Figure 5 As shown in (Embodiment 1), when the wavelength of the incident wave changes, an obvious electromagnetic induction transparent window can be observed, and the maximum transmittance reaches 98%.

Embodiment approach 2

[0034]Embodiment 2: In the case of changing the materials of the dielectric substrate and / or the cylindrical and hollow cylindrical structures, the obvious EIT electromagnetic induction transparent window can still be observed in this embodiment. For example, on the basis of Embodiment 1, the material of the dielectric substrate is changed to sapphire with a dielectric constant of 3.1, the material of the cylindrical and hollow cylindrical structures is changed to gallium arsenide with a dielectric constant of 12.9, and in a certain Adjust the size parameters within the range, adjust the Fermi level to 0.6ev, and the transmittance curve spectrum from 1370 nm to 1470 nm can be observed as Figure 5 As shown in (Embodiment 2), the electromagnetic induction transparent window still exists, and the maximum transmittance reaches 97%, which also has the characteristics of high transmittance and high quality factor. This feature will reduce the processing difficulty of related device...

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Abstract

The invention discloses a method for realizing tunable electromagnetic induction transparency based on a graphene-medium composite metasurface. The composite dielectric metasurface is designed by utilizing the electromagnetic field coupling effect and the special photoelectric property of graphene so as to realize a tunable electromagnetic induction transparency phenomenon. The structure is divided into a top layer, a middle layer and a bottom layer, wherein the bottom layer is a medium substrate, the middle layer is medium nano-columns and hollow medium nano-columns which are periodically arranged, and the uppermost layer is single-layer graphene which covers the upper surface of the nano-structure. Through the design of the substrate and the middle layer nanorod material, the structure size and the like, the tunable electromagnetic induction transparency effect can be flexibly regulated and controlled in the near-infrared band. By changing the size parameters of the structure, the electromagnetic induction transparent window can realize red shift or blue shift under the condition of keeping the transmittance unchanged. In addition, the strength of the electromagnetic induction transparent window can be modulated by applying a voltage to adjust the Fermi level of the graphene, and the modulation depth can reach 54%.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave regulation and focuses on efficient, high-performance and flexible regulation of electromagnetic waves in the near-infrared band, and in particular relates to a method for realizing tunable electromagnetic induction transparency based on a graphene-dielectric composite metasurface. Background technique [0002] Electromagnetic induction transparency (EIT) refers to the phenomenon that the originally opaque medium can produce a narrow-band transparent window under the coupling effect of electromagnetic field. This phenomenon arises due to quantum destructive interference in a three-level system. The EIT effect allows light to pass through opaque media, and during the generation of the EIT phenomenon, the micro-nano structure interacts strongly with electromagnetic waves, often resulting in some unique characteristics, most notably strong dispersion. These characteristics make it of great potent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00G02B5/00
CPCH01Q15/00G02B5/00
Inventor 高凡鄢波高少军袁培程邓娟蔡萍根陈乃波吕斌李芸
Owner ZHEJIANG UNIV OF TECH
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