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Multiple Fano Resonances with Tunable Electromagnetic Properties in Graphene Plasmonic Metamolecules

1
Fujian Key Laboratory of Light Propagation and Transformation, College of Information, Science and Engineering, Huaqiao University, Xiamen 361021, China
2
Fujian Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, China
3
College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100086, China
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Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100086, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(2), 236; https://doi.org/10.3390/nano10020236
Received: 9 December 2019 / Revised: 25 January 2020 / Accepted: 27 January 2020 / Published: 29 January 2020
(This article belongs to the Section Nanocomposite Thin Films and 2D Materials)
Multiple Fano resonances (FRs) can be produced by destroying the symmetry of structure or adding additional nanoparticles without changing the spatial symmetry, which has been proved in noble metal structures. However, due to the disadvantages of low modulation depth, large damping rate, and broadband spectral responses, many resonance applications are limited. In this research paper, we propose a graphene plasmonic metamolecule (PMM) by adding an additional 12 nanodiscs around a graphene heptamer, where two Fano resonance modes with different wavelengths are observed in the extinction spectrum. The competition between the two FRs as well as the modulation depth of each FR is investigated by varying the materials and the geometrical parameters of the nanostructure. A simple trimer model, which emulates the radical distribution of the PMM, is employed to understand the electromagnetic field behaviors during the variation of the parameters. Our proposed graphene nanostructures might find significant applications in the fields of single molecule detection, chemical or biochemical sensing, and nanoantenna.
Keywords: Fano resonances; graphene metamolecule; chemical potential; surface plasmon; plasmonic coupling; modulation depth Fano resonances; graphene metamolecule; chemical potential; surface plasmon; plasmonic coupling; modulation depth
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MDPI and ACS Style

Zhou, H.; Su, S.; Qiu, W.; Zhao, Z.; Lin, Z.; Qiu, P.; Kan, Q. Multiple Fano Resonances with Tunable Electromagnetic Properties in Graphene Plasmonic Metamolecules. Nanomaterials 2020, 10, 236.

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