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Zhang, Jianguo; Tian, Jinping; Li, Lu
IEEE photonics journal, 04/2018, Letnik: 10, Številka: 2Journal Article
A three-dimensional dual-band perfect absorber in the THz range (3-10 THz) is theoretically investigated. The absorber is composed of periodically placed cross-and disk-shaped graphene arrays on the top of a gold layer separated by a thick SiO 2 dielectric spacer. The simulated results show two absorption peaks with near-unity absorbance (99.923% and 99.601%) at wavelengths 43.747 μm and 69.94 μm, respectively. Also, the absorber is insensitive to the polarization of the incident light and has a good tolerance to the incident angle whether it is TE or TM waves. Moreover, the peak wavelengths of the absorber can be flexibly modulated by varying the Fermi level μ C of graphene while no need to refabricate the structure. This paper provides a new perspective for the design of graphene-based tunable multiband perfect THz absorbers, but not limited to THz absorbers, and may also be used in other THz graphene-based photonic devices.
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