Journal
PHYSICS LETTERS A
Volume 383, Issue 24, Pages 3030-3035Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2019.06.028
Keywords
Metamaterial absorber; Dual-band; Graphene; Refractive index sensing
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Funding
- National Natural Science Foundation of China (NNSFC) [51606158, 11604311, 61705204, 21506257, 11847132]
- Natural Science Foundation of Hunan Province [2018JJ2019]
- Research Foundation of Education Bureau of Hunan Province [16B048]
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In this paper, we report a numerical investigation of tunable dual-band metamaterial perfect absorber (MMPA) consisting of two-intersecting graphene nanorings arrays. The optical absorption performance of absorber is dominated by the inner/outer radius of nanorings and center distance between the two nanorings. For the resonance modes lambda(1) and lambda(2), the sensitivity of probing the surrounding refractive index can reach 7.97 mu m/RIU and 13.27 mu m/RIU respectively. The absorption performance of the under-study graphene nanorings can be flexibly adjusted by modulating the Fermi level of graphene with voltage. Due to excellent wavelength selectivity and high refractive-index sensitivity, the presented tunable dual-band MMPA has great application prospects as sensors in biopharmaceutical, environmental monitoring. (C) 2019 Elsevier B.V. All rights reserved.
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