期刊
PHYSICS LETTERS A
卷 383, 期 22, 页码 2589-2593出版社
ELSEVIER
DOI: 10.1016/j.physleta.2019.05.020
关键词
Diffraction and gratings; Metamaterials; Graphene; Spectrum selective absorption
资金
- National Natural Science Foundation of China [61405217]
The tunable multi-band selective absorption effect with graphene nano-ribbon metamaterial is investigated. It is achieved by depositing a set of graphene nano-ribbons on a dielectric spacer backed with a metallic mirror. A dual-band and tri-band absorbers are designed to illustrate such multi-band selective absorption behavior. The designed graphene absorbers exhibit near-unity absorption at multiple resonance frequencies, which is attributed to the plasmonic resonance of graphene nano-ribbons with different widths. Moreover, the multiple resonance wavelengths can be tuned in a wide frequency range by changing the Fermi energy and the absorbers possess large angle insensitivity. Last, a Fabry-Perot model is employed to give a physical understanding of such multi-band selective absorption effect. It is believed that the conclusions may be useful for designing of next-generation graphene-based optoelectronic devices. (C) 2019 Elsevier B.V. All rights reserved.
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