Metamaterial crystal structure capable of regulating electromagnetic wave absorption and preparation method of structure

Abstract

The invention provides a metamaterial crystal structure capable of regulating electromagnetic wave absorption and a preparation method. The preparation method comprises the steps that a blazed gratingsubstrate is provided, wherein serrated array structures in periodical arrangement are formed on the surface of the blazed grating substrate, and each serrated array structure comprises a first groove surface with a first dip angle and a second groove surface with a second dip angle; and an alternate multilayer film structure is formed on the blazed grating substrate, wherein the alternate multilayer film structure comprises a plurality of metamaterial structure units, each metamaterial structure unit comprises a first equivalent dielectric constant unit and a second equivalent dielectric constant unit, and an electromagnetic wave absorption interface is formed between each first equivalent dielectric constant unit and the corresponding second equivalent dielectric constant unit. According to the metamaterial crystal structure, absorption of electromagnetic waves can be regulated according to need, and characteristic absorption peaks of the electromagnetic waves can be precisely regulated by regulating interface wave vectors supported by the metamaterial crystal structure, material parameters of a multilayer film and a blazing angle of a grating; and an absorption coefficient of the electromagnetic waves can be effectively regulated by regulating the period P, namely a grating constant, of the metamaterial crystal structure, and the absorption of the electromagnetic waves in different frequency bands can be regulated without the need for redesigning the metamaterial crystal structure.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic metamaterials, in particular to a metamaterial crystal structure capable of regulating electromagnetic wave absorption and a preparation method thereof. Background technique [0002] At present, with the rapid development of micro-nano processing technology, new artificial microstructures are constantly emerging. Among them, electromagnetic metamaterials are artificial microstructures composed of subwavelength or deep subwavelength electromagnetic response unit arrays. Compared with traditional electromagnetic materials, electromagnetic metamaterials can more flexibly control the transmission of electromagnetic waves and the interaction between electromagnetic waves and matter. For example, the permittivity and permeability of specially designed metamaterials can be negative at the same time, realizing the negative refraction transmission of electromagnetic waves, which is a characteristic...

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Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a metamaterial crystal structure that can regulate electromagnetic wave absorption and its preparation method, which is used to solve the problem that artificial microstructures or metamaterials in the prior art are often only sensitive to specific frequencies. (segment) electromagnetic waves are effective, and it is impossible to flexibly control the electromagnetic wave absorption characteristics of each frequency band.

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