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- W4323543990 abstract "A bifunctional absorber with hybrid graphene–vanadium dioxide (VO 2 ) is proposed and numerically investigated in the paper. Simulation results indicate that the absorber behaves as a broadband absorber with absorptance of more than 90% from 3.15 THz to 8.45 THz, when VO 2 is in the metallic state. When VO 2 is in the insulating state, the design exhibits a 10-band absorber, whose peak absorptances are above 90%. Broadband absorption is investigated by the impedance matching theory, and detailed physical studies indicate that it arises from electromagnetic resonance based on VO 2 patches. Ten-band absorption originates from graphene plasmon (GP) resonance and Fabry–Perot cavity resonance. By adjusting the conductivity of VO 2 and the Fermi level of graphene, the designed absorber not only can be independently tuned, but also has 91.9% modulation depth under broadband absorptance. Furthermore, the effect of incident angle on absorptance is investigated, and the absorber is polarization insensitive due to the symmetry of the structure. Benefiting from the above excellent performance, the bifunctional absorber offers great potential in terahertz applications, such as modulating, switching, and electromagnetic energy harvesting." @default.
- W4323543990 created "2023-03-09" @default.
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- W4323543990 date "2023-04-04" @default.
- W4323543990 modified "2023-09-28" @default.
- W4323543990 title "Design of a switchable bifunctional terahertz metamaterial absorber from ultra-broadband to 10-band" @default.
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- W4323543990 doi "https://doi.org/10.1364/josab.480755" @default.
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