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Multipolar Plasmonic Resonances of Aluminum Nanoantenna Tuned by Graphene

机译:石墨烯铝纳米纳米纳米纳米纳米末端的多极等极性谐振

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摘要

We numerically investigate the multipolar plasmonic resonances of Aluminum nanoantenna tuned by a monolayer graphene from ultraviolet (UV) to visible regime. It is shown that the absorbance of the plasmonic odd modes (l = 1 and l = 3) of graphene–Al nanoribbon structure is enhanced while the absorption at the plasmonic even modes (l = 2) is suppressed, compared to the pure Al nanoribbon structure. With the presence of the monolayer graphene, a change in the resonance strength of the multipolar plasmonic modes results from the near field interactions of the monolayer graphene with the electric fields of the multipolar plasmonic resonances of the Al resonator. In particular, a clear absorption peak with a high quality (Q)-factor of 27 of the plasmonic third-order mode (l = 3) is realized in the graphene–Al nanoribbon structure. The sensitivity and figure of merit of the plasmonic third-order mode of the proposed Graphene–Al nanoribbon structure can reach 25 nm/RIU and 3, respectively, providing potential applications in optical refractive-index sensing.
机译:我们在数值上研究了由紫外线(UV)的单层石墨烯调谐的铝纳米纳米的多极等离子体共振至可见状态。结果表明,与纯Al纳米臂相比,抑制了石墨烯-A1纳米纳米结构的质粒奇数模式(L = 1和L = 3)的差异奇数模式(L = 1和L = 3)的吸光度,同时抑制了等离子体均匀模式(L = 2)结构体。随着单层石墨烯的存在,多极性等离子体模式的谐振强度的变化是由单层石墨烯的近场相互作用与Al谐振器的多极性等离子体的电场的电场。特别地,在石墨烯-A1纳米泊结构中实现了具有高质量(Q)活体的明显吸收峰,其27的等级三阶模式(L = 3)中实现。所提出的石墨烯-Al纳米孔结构的等离子体三阶模式的敏感性和函数分别可以达到25nm / RiU和3,在光学折射率感测中提供潜在的应用。

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