Abstract
A metasurface absorber based on the slow-wave effect has the advantages of long interaction time and high absorption. A slow-wave metasurface absorber is constructed using the periodic arrangement of the Jerusalem cross, which achieves a reflectivity of −15.0 dB at 5.0 GHz. Furthermore, dual-frequency absorption is realized by the coupling of two unit cells with different sizes. The calculated delay time of metasurfaces further confirms the underlying absorption. The design of metasurfaces through the slow-wave effect provides new ideas to the field of absorbing metasurfaces and creates broad application prospects.
Highlights
Metamaterials can achieve properties not found in natural materials, such as negative electromagnetic parameters,1,2 negative refractive index,3 etc
Metasurfaces are planar metamaterials which can control the phase of light7 and manipulate electromagnetic waves,8 such as all-dielectric metasurfaces,9 tunable metasurfaces,10 and parity-time metasurfaces
The research of slow wave mainly focuses on the optical frequency band, that is, slow light
Summary
Metamaterials can achieve properties not found in natural materials, such as negative electromagnetic parameters,1,2 negative refractive index,3 etc. Slow-wave metasurfaces can prolong the interaction time between electromagnetic waves and matter, and it is an effective way to absorb waves through resonance loss.
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