Open AccessWideband metasurface absorber (metabsorber) using characteristic mode analysis
Author(s) -
Zi Song,
Jiaqi Zhu,
Lei Yang,
Pingping Min,
Feng Han Lin
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.443182
Subject(s) - wideband , optics , lossy compression , bandwidth (computing) , lossless compression , absorptance , physics , modal analysis , absorption (acoustics) , acoustics , reflectivity , telecommunications , computer science , data compression , artificial intelligence , vibration , computer vision
Designing an ultra-wideband metasurface absorber is challenging because of its lossy characteristic that hinders the understanding of its resonance behavior. In this study, a framework was formulated to extend the application of the theory of characteristic modes to the analysis and design of metabsorbers. The metabsorber and its lossless counterpart exhibited similar modal behaviors, hence revealing the absorption mechanism of metabsorber. By introducing absorption modes, a dual-band metabsorber was converted into an ultra-wideband metabsorber. This proposed metabsorber with a thickness of 1.99 times the Rozanov's limit could measure a bandwidth of 5.51-36.56 GHz (or 6 octaves) with 90% absorptance.