Near infrared absorber based on graphene/metal nanometer belt structure

Abstract

The invention relates to a near infrared absorber based on a graphene/metal nanometer belt structure and belongs to a perfect electromagnetic wave absorber. When incoming wave irradiates a metal nanometer belt array, the magnetic resonance effect is excited by the incoming wave at the metal nanometer belt, energy of the incoming wave is substantially enhanced at a gap of the metal nanometer belt, after upper and lower portions of the metal nanometer belt are respectively added with a graphene layer, electromagnetic wave energy is enhanced, the upper and lower graphene layer effect is enhanced, absorption is further carried out, and the resonance wavelength electromagnetic wave energy is integrally absorbed in a perfect mode. The near infrared absorber is advantaged in that five structure layers are comprised, sequentially comprising a substrate (1), an insulation layer (2), the first graphene layer (3), the metal nanometer belt (4) and the second graphene layer (5), and the specific wavelength can be absorbed to a nearly perfect degree through adjusting structural geometric parameters.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, and in particular relates to a structure design of a near-infrared absorber based on a graphene / metal nanobelt structure, which realizes near-perfect absorption of electromagnetic waves in the near-infrared band. Background technique [0002] In many fields such as photoelectric detection, solar energy, thermal sensing, and stealth technology, there are high requirements for the absorption performance of photoelectric materials, and a high absorption rate for electromagnetic wave energy is required. Optoelectronic devices such as photoelectric detection and photovoltaic devices rely on photoelectric materials to convert absorbed light into electrical energy or electrical signals to achieve their functions. Under a certain conversion efficiency, the more light absorbed, the stronger the electrical signal generated. The larger it is, the higher the efficiency of the optoelectronic device as...

AI Technical Summary

Problems solved by technology

[0005] Under the guidance of this design concept, in 2014, Zhao et al. introduced graphene into the periodic silver nano-grating structure, and used the high-aspect-ratio silver grating to excite magneton resonance (MP) and the resistance effect of graphene to Improve the absorption rate of graphene to achieve perfect absorption, but because this kind of deep grating is difficult to process, it is not conducive to practical application

In 2015, the team of Xiamen University also introduced graphene into the absorber structure, combined with gold nanoribbons to stimulate the local surface plasmon effect, and realized the absorption of visible light band, but the absorption rate is not ideal

The results show that at a specific wavelength, graphene's absorption of electromagnetic waves increases by 16 times, but the absorption rate of the overall structure is only 60%, which still cannot achieve perfect absorption of specific wavelengths.

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