Ultra-broadband metamaterial absorbers from long to very long infrared regime.

ABSTRACT: Broadband metamaterials absorbers with high absorption, ultrathin thickness and easy configurations are in great demand for many potential applications. In this paper, we first analyse the coupling resonances in a Ti/Ge/Ti three-layer absorber, which can realise broadband absorption from 8 to 12 μm. Then we experimentally demonstrate two types of absorbers based on the Ti/Ge/Si₃N₄/Ti configuration. By taking advantage of coupling surface plasmon resonances and intrinsic absorption of lossy material Si₃N₄, the average absorptions of two types of absorbers achieve almost 95% from 8 to 14 μm (experiment result: 78% from 6.5 to 13.5 μm). In order to expand the absorption bandwidth, we further propose two Ti/Si/SiO₂/Ti absorbers which can a

SUBMITTER: Zhou Y 

PROVIDER: S-EPMC8257711 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature