All-graphene perfect broadband THz absorber

By combining the 3D printing, electroplating and chemical vapor deposition processes we fabricated bubble wrap polymer nanomembrane covered with multilayered graphene. Such a metasurface composed of array of graphene hemispheres shows extremely broadband and almost perfect absorption in terahertz (THz)(2) frequency range being robust against macroscopic structural defects including holes and volcanic-like hats on hemispherical metaatoms. The developed theory perfectly explains our experimental findings including virtual independence of the metasurface transmittivity, reflectivity and absorptivity on the angle of incidence in terms of the plasmon dark mode formation. Our approach enables the THz perfect absorber that covers a frequency range spanning from few hundreds of GHz to 1.2 THz, and even more, while the proposed fabrication technique can also be employed in numerous applications that require free standing corrugated graphene/polymer nanomembranes. (C) 2021 The Author(s). Published by Elsevier Ltd.

Automated summary

A novel technique involving 3D printing, electroplating, and chemical vapor deposition was used to fabricate a polymer nanomembrane covered with multilayered graphene, showing nearly perfect absorption in the THz frequency range. The theoretical explanation provided insights into the dark mode formation of the metasurface, enabling potential applications in various fields requiring graphene/polymer nanomembranes.