3D Lightweight Broadband Terahertz Absorber Based on Reduction Graphene Oxide

With the development of terahertz (THz) communication and detection technology, great attentions have been paid to terahertz absorbing and shielding materials. In this work, and lightweight and high-performance terahertz wave absorber with a three-dimension structure is designed and fabricated. Due to the excellent impedance matching on the macroscopic interface and the multiple reflection/absorbing inside the micropores structure, the obtained 3D reduction graphene oxide (3D-rGO) pyramidal absorber, shows a best average absorption intensity (AAI) of -30 dB. The bandwidth for strong absorption with the reflection loss (RL⩽-20 dB) covers 93% of the entire test band from 0.3~1.2 THz. This strategy of combining pyramidal absorbing unit with porous conductive materials pay the way to realize high-performance THz absorbers for practical applications.