Yan Zhendong, Zhu Qi, Lu Xue, Du Wei, Pu Xingting, Hu Taoping, Yu Lili, Huang Zhong, Cai Pinggen, Tang Chaojun
College of Science, Nanjing Forestry University, Nanjing 210037, China.
College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China.
Nanomaterials (Basel). 2021 Jan 13;11(1):185. doi: 10.3390/nano11010185.
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 ( = 1 and = 3) of graphene-Al nanoribbon structure is enhanced while the absorption at the plasmonic even modes ( = 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 ()-factor of 27 of the plasmonic third-order mode ( = 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.
我们通过数值方法研究了由单层石墨烯调谐的铝纳米天线在从紫外（UV）到可见光波段的多极等离子体共振。结果表明，与纯铝纳米带结构相比，石墨烯 - 铝纳米带结构的等离子体奇模（(m = 1)和(m = 3)）的吸光度增强，而等离子体偶模（(m = 2)）的吸收受到抑制。由于单层石墨烯的存在，多极等离子体模式的共振强度发生变化，这是由单层石墨烯与铝谐振器的多极等离子体共振电场的近场相互作用引起的。特别是，在石墨烯 - 铝纳米带结构中实现了具有27的高品质（(Q)）因子的等离子体三阶模式（(m = 3)）的清晰吸收峰。所提出的石墨烯 - 铝纳米带结构的等离子体三阶模式的灵敏度和品质因数分别可达25 nm/RIU和3，在光学折射率传感方面具有潜在应用。
