期刊
MATERIALS
卷 15, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/ma15062296
关键词
graphene; dual-band; metamaterial perfect absorber; surface plasmon
类别
资金
- National Natural Science Foundation of China [62075058, U1804261]
- Outstanding Youth Foundation of Henan Normal University [20200171]
- Natural Science Foundation of Henan Province [222300420011, 222300420209]
- Project of Science and Technology of the Henan Province in China [212102310907]
- Doctoral Fund of Henan University of Engineering [D2017013]
This paper proposes a plasmonic absorber composed of non-concentric graphene nanodisk arrays, which can achieve nearly perfect absorption in the mid-infrared spectral range. The influences of dielectric layer thickness, graphene nanodisk size, and incident conditions on absorption are studied. The absorber has potential applications in optical detectors, tunable sensors, and band-pass filters.
Due to its unique electronic and optical properties, graphene has been used to design tunable optical absorbers. In this paper, we propose a plasmonic absorber consisting of non-concentric graphene nanodisk arrays, which is designed to operate in the mid-infrared spectral range and is capable of achieving nearly perfect absorption. Two perfect absorption peaks are produced due to the impedance of the structure, which matches that of the free space. The influences of the thicknesses of the dielectric layer, the size of graphene nanodisk, and the incident conditions on the absorption are studied. Moreover, the absorption intensity can be independently tuned by varying the Fermi levels of two graphene nanodisks. Furthermore, the polarization-independent absorbance of the absorber exceeds 95% under oblique incidence, and remains very high over a wide angle. This proposed absorber has potential applications in optical detectors, tunable sensors, and band-pass filters.
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