Tunable broadband terahertz absorber based on graphene with bilayer hexagonal
Source abstract
Abstract
An ultra-wideband absorber with an absorption rate of near unit is studied and numerically simulated in the terahertz frequency band. The proposed absorber is a stacked compact structure consisting of a double-layer patterned graphene embedded between two separated dielectric. Under normal incidence, the absorption rate exceeds 99% at 2.31–3.92 THz. The absorption bandwidth can reach 2.54 THz for absorptions greater than 90% (1.91–4.45 THz), and the relative bandwidth achieves 80%. Furthermore, the absorber is tunable, with absorption ranging from 14% to almost 99.9% by altering the Fermi energy of graphene from 0 to 1 eV. The phenomenon of ultra-wideband absorption is analyzed in relation to impedance matching and field distribution. Moreover, the absorber has high polarization-independence and can operate across a broad range of incidence angles. This tunable ultra-wideband absorber has promising functions in modulation, stealth, switching, and imaging technologies.
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Research context
OpenAlex topics: Metamaterials and Metasurfaces Applications · Advanced Antenna and Metasurface Technologies · Graphene research and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of Grain Information Processing and Control, Ministry of Education (Henan University of Technology) 1 , Zhengzhou 450001, China
Henan Key Laboratory of Grain Photoelectric Detection and Control (Henan University of Technology) 2 , Zhengzhou 450001, China
College of Information Science and Engineering, Henan University of Technology 3 , Zhengzhou 450001, China
Funding
National Natural Science Foundation of China · Research Foundation for University Key Teacher of Henan Province · Research Foundation for Key Teacher of Henan University of Technology · Innovation Funds Plan of Henan University of Technology
References (30)
Show source-provided references
1. Wireless sub-THz communication system with high data rate10.1038/nphoton.2013.275 ↗
2. Spatiotemporal light control with active metasurfaces10.1126/science.aat3100 ↗
3. Terahertz polarization-insensitive and all-optical tunable filter using Kerr effect in graphene disks arrays10.1016/j.ijleo.2018.11.103 ↗
4. Terahertz absorber with dynamically switchable dual-broadband based on a hybrid metamaterial with vanadium dioxide and graphene10.1364/oe.428790 ↗
5. All-optical switchable vanadium dioxide integrated coding metasurfaces for wavefront and polarization manipulation of terahertz beams10.1002/adts.201900183 ↗
6. Terahertz phase imaging and biomedical applications10.1016/j.optlastec.2019.105859 ↗
7. Perfect metamaterial absorber10.1103/physrevlett.100.207402 ↗
8. A three-dimensional all-metal terahertz metamaterial perfect absorber10.1063/1.4996897 ↗
9. A new Ba0.6Sr0.4TiO3-silicon hybrid metamgefial device in terahertz regime10.1002/smll.201600276 ↗
10. Electrically tunable criticall coupled terahertz metamaterial absorber based on nematic liquid crystals10.1103/PhysRevApplied.3.064007 ↗
11. Gate-tunable conducting oxide metasurfaces10.1021/acs.nanolett.6b00555 ↗
12. Tunable wideband-narrowband switchable absorber based on vanadium dioxide and graphene10.1364/oe.476296 ↗
13. Terahertz stepped wideband absorber based on graphene metamaterials10.1063/5.0029886 ↗
14. A roadmap for graphene10.1038/nature11458 ↗
15. Design of a broadband tunable terahertz metamaterial absorber based on complementary structural graphene10.3390/ma11040540 ↗
16. A broadband tunable terahertz metamaterial absorber based on single-layer complementary gammadion-shaped graphene10.3390/ma13040860 ↗
17. Polarization insensitive broadband concentric- annular-strip octagonal terahertz graphene metamaterial absorber10.1109/jphot.2021.3123608 ↗
18. Plasmonic absorption characteristics based on dumbbell-shaped graphene metamaterial arrays10.1016/j.physe.2018.05.033 ↗
19. Synthesis of highly confined surface plasmon modes with doped graphene sheets in the midinfrared and terahertz frequencies10.1103/physrevb.85.125431 ↗
20. Quasi-transverse electromagnetic modes supported by a graphene parallel-plate waveguide10.1063/1.3005881 ↗
21. A broadband metamaterial absorber based on multi-layer graphene in the terahertz region10.1016/j.optcom.2018.02.034 ↗
22. Tunable ultra-broadband terahertz perfect absorber based on vanadium oxide metamaterial10.1364/oe.444761 ↗
23. Gated tunability and hybridization of localized plasmons in nanostructured graphene10.1021/nn3055835 ↗
24. Plasmonic absorption enhancement in periodic cross-shaped graphene arrays10.1364/oe.23.008888 ↗
25. Independently tunable perfect absorber based on the plasmonic properties in double-layer graphene10.1016/j.carbon.2019.09.024 ↗
26. Tunable polarization-independent and angle-insensitive broadband terahertz absorber with graphene metamaterials10.1364/oe.418865 ↗
27. Graphene-based dual-band independently tunable infrared absorber10.1039/c8nr02525h ↗
28. Switchable broadband terahertz absorber/reflector enabled by hybrid graphene-gold metasurface10.1364/oe.25.007161 ↗
29. Broadband absorber with periodically sinusoidally-patterned graphene layer in terahertz range10.1364/oe.25.011223 ↗
30. Electrically tunable broadband terahertz absorption with hybrid-patterned graphene metasurfaces10.3390/nano8080562 ↗