Functional devices based on graphene two-dimensional metamaterials

Abstract

The present invention provides a functional device based on graphene two-dimensional metamaterial, which includes a reflective layer, a dielectric layer and a graphene micro-nano structure layer sequentially arranged on a substrate, wherein the graphene micro-nano structure layer includes A plurality of graphene combination units are arranged, each graphene combination unit includes a plurality of arranged graphene scattering units, and the structures of the plurality of graphene scattering units are identical to each other. The invention can realize functional devices with different functions by changing the arrangement mode of the graphene scattering units. In these functional devices, the resonant frequency of the graphene scattering unit can be adjusted by uniformly modulating the Fermi level of the graphene scattering unit by using a single electrode, combined with the high mobility characteristics of graphene, the dynamic regulation of the incident light transmission can be realized. . In addition, higher conversion efficiency can be obtained due to the larger intensity of reflected light that produces the PB phase shift in the graphene 2D metamaterial.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, and in particular relates to a functional device based on graphene two-dimensional metamaterial. Background technique [0002] Two-dimensional metamaterials, also known as metasurfaces, are functional devices formed by the arrangement of discrete scatterers with different scattering phases according to certain rules. The design concept of this novel functional device was first proposed by Yu Nanfang et al. on page 333, volume 334 of Science. [0003] By setting the spatial distribution rules of the phase mutation of the scatterers in the layer, the metasurface can not only realize the traditional functions such as anomalous reflection / transmission interface, converging / diverging lens, holographic imaging and optical rotation, but also produce anomalous photon spin Hall effect, etc. Novel optical phenomena, which cannot be realized by traditional optical devices. However, most two-dimens...

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Problems solved by technology

[0005] However, the graphene metamaterials reported in the previous literature can only realize one-dimensional electromagnetic property control, and each graphene strip needs an independent bias voltage to modulate its scattering phase, and the design of its driving circuit is difficult to realize.

In addition, the conversion efficiency of these graphene metamaterials is very low due to the high-order diffraction effect caused by the different scattering field strengths of the graphene strips and the ohmic loss, which greatly limits the application space of graphene metamaterials.

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