Structure of broadband wave absorber and preparation method

Abstract

The invention provides a structure of a broadband wave absorber and a preparation method. The structure comprises a substrate layer and a half-pyramid structure arranged on the substrate layer, wherein the half-pyramid structure is formed by alternately stacking and combining multiple metal-medium layers, the size of the structure is decreased progressively from bottom to top in the Z direction, the structure is a symmetrical structure, and the axis of symmetrical is a connecting line of centers of the metal-medium layers. A substrate is coated with the metal-medium layers sequentially with a coating method, and then the half-pyramid structure is etched. The structure is simple: the structure of the wave absorber is single and convenient to prepare. The spectrum is easy to measure: at the measurement stage, the band ranging from 8 mu m to 14 mu m is a middle infrared band, and the transmission and reflection spectrum of the structure can be acquired easily by the aid of existing equipment, so that the absorption spectrum is acquired.

Description

Technical field [0001] The invention relates to the field of integrated optics, in particular to the structure and preparation method of a broadband wave absorber. Background technique [0002] For electromagnetic waves of a specific frequency, the absorption bandwidth of the existing wave absorber is narrow and cannot achieve high absorption in the entire spectrum. [0003] For electromagnetic waves of a specific frequency, the absorption angle of the existing wave absorber is small, and it cannot achieve high absorption in a large angle range. [0004] For electromagnetic waves of specific frequencies, existing wave absorbers are sensitive to the polarization direction of the incident electromagnetic waves, and cannot achieve good absorption. [0005] According to the absorption bandwidth, the existing wave absorbers can be divided into three types: narrowband absorbers, multi-frequency absorbers and broadband absorbers. Its structure generally adopts a metal-dielectric-metal three...

AI Technical Summary

Problems solved by technology

The frequency of the electromagnetic waves absorbed by the general multi-frequency absorber is scattered, it cannot achieve continuous absorption, and the absorption of several frequencies will compromise with each other, and it cannot be taken into account, resulting in weakened absorption.

Broadband absorbers generally adopt a multi-layer design, and several different structures are superimposed and coupled together, but the existing problem is that the structure is complex and difficult to manufacture

Existing absorbers generally have a narrow absorption angle and are sensitive to the polarization direction of incident electromagnetic waves, which greatly limits the application of existing absorbers

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