Frontiers and prospects for metamaterial transparent absorbers
Absorbing materials play a crucial role in electromagnetic invisible technology.Compared with non-transparent materials,transparent absorber faces more complex and unique challenges in the field of electromagnetic absorption.Classic transparent absorbers exhibit irreconcilable contradictions in several key performance indicators such as optical transparency,thickness,electromagnetic absorption bandwidth,oblique and polarization stability.With the introduction of metasurfaces into transparent absorbers,these key performances have been significantly improved,thereby further promoting their practical application in the field of electromagnetic invisibility.This paper reviews the research on metamaterial-based transparent absorbers.Initially,the paper discusses the optical transparency and electromagnetic absorption mechanisms of transparent absorbers and analyzes and summarizes the working principles and limitations of classic transparent absorbers.Then,it summarizes the research progress and design methods of metamaterial in improving the classic performance of transparent absorbers in wideband electromagnetic absorption,oblique and polarization stability.To foresee future development directions,the paper details the technological principles and research frontiers of recent advances in transparent absorbers in hybrid mechanism design,multispectral design,and dynamic tunable performance,and looks forward to the emerging directions bringing multifunctionality,multi-mechanism,and intelligence to transparent absorbers.
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