Ultra-broadband THz absorbers based on 3D graphene

0576637 - FZÚ 2024 RIV US eng J - Journal Article
Kumar, Prabhat - Šilhavík, Martin - Červenka, Jiří - Kužel, Petr
Ultra-broadband THz absorbers based on 3D graphene.
Journal of Physics D-Applied Physics. Roč. 56, č. 50 (2023), č. článku 505103. ISSN 0022-3727. E-ISSN 1361-6463
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GX19-28375X
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : absorbers * terahertz * 3D graphene
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.4, year: 2022
Method of publishing: Open access

We use terahertz and multi-terahertz spectroscopy to investigate optical properties of three-dimensional (3D) graphene across a wide frequency range of 0.15–10 THz. We explore the electromagnetic shielding, stealth, and absorber capabilities of 3D graphene samples annealed at various temperatures up to 1300°C. We show that the tradeoff between the transmitted, absorbed and reflected power of the materials can be controlled by the annealing temperature through a fine broadband tuning of the refractive and absorptive indices of the material. Depending on the annealing conditions, this ultralight system is capable of acting as a stealth element, THz absorber or a shielding coating within an ultrabroadband range of 0.2–7 THz. All these properties can be combined by stacking these materials on top of each other.
Permanent Link: https://hdl.handle.net/11104/0346412