Coupling of Whispering-Gallery Modes in the Graphene Nanodisk Plasmonic Dimers |
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Authors: | Weibin Qiu Yixin Huang Houbo Chen Pingping Qiu Yixin Tang Jia-Xian Wang Qiang Kan Jiao-Qing Pan |
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Affiliation: | 1.Huaqiao University,Xiamen,China;2.Institute of Semiconductors, Chinese Academy of Science,Beijing,China |
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Abstract: | In this paper, we proposed plasmonic dimers consisted of two evanescent field coupled graphene monolayer nanodisks. The electromagnetic properties including the split modes with non-degenerate wavelengths, enhancement of the quality factors (Q factors) and mode areas, and the coupling between the fundamental and the first-order whispering-gallery modes are numerically predicted and analyzed systematically. Compared with the single graphene nanodisk, the Q factor of TM4,1 reaches 356 in a dimer with a radius of 5 nm of each nanodisk and an inter-disk gap of 0.4 nm, where the corresponding mode area is as small as 6.88?×?10‐?5(λ 0)2. In addition, the enhanced performances of size-mismatched coupled graphene plasmonic dimers are investigated. This graphene monolayer plasmonic dimer could be one of the fundamental components in the future ultra-high density plasmonic circuit technique, on-chip plasmonic interconnect, and transformation plasmonics. It also could be used as the test-beds for added explorations of cavity quantum electrodynamic experiments. |
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