Printable and low-cost perfect terahertz absorber realized by a laser-induced graphene metasurface

Terahertz (THz) absorbers are highly desired with the rapid development of THz technology. Although metasurface-based absorbers can realize perfect absorption, their fab-rication often requires complicated micro-nano-processing with a high cost. In this paper, fast printable and low-cost metasurface absorbers based on a laser-induced graphene (LIG) technique are proposed. Experimental results demon-strate that these two metasurfaces can achieve maximum absorptions of 99.3% and 99.9% at their resonant frequen-cies in an incident angle range of +/- 55 degrees. Fabrication of a metasurface with a size of 1 x 1 cm costs only 11 s. The absorbers may be applied in THz dichroism and commu-nications. (c) 2023 Optica Publishing Group