Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (8): 2374.doi: 10.7503/cjcu20210289

• Inorganic Chemistry • Previous Articles     Next Articles

Fabrication and Optical Mechanism of Plasmonic Nanodimer with Uniform Orientation

WANG Zhaoyi1,2, MU Shilin2, ZHANG Xuemin3(), ZHANG Junhu2()   

  1. 1.China?Japan Union Hospital of Jilin University,Changchun 130031,China
    2.State Key Laboratory of Supramolecular Structure and Materials,College of Chemistry,Jilin University,Changchun 130012,China
    3.College of Sciences,Northeastern University,Shenyang 110819,China
  • Received:2021-04-26 Online:2021-08-10 Published:2021-08-05
  • Contact: ZHANG Junhu E-mail:zhangxuemin@mail.neu.edu.cn;zjh@jlu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21975098);the China Postdoctoral Science Foundation(2020T130042ZX)

Abstract:

Vertically stacked plasmonic dimers were succussfully fabricated by step-by-step evaporation of Au, SiO2 and Au(or Ag) with monolayer colloidal spheres mask followed by annealing treatment. The novel method offers sufficient degree of freedom to construct both homo- and hetero- plasmonic dimers with the same orientation over a macroscopic scale. Hybridization between the plasmon modes of the top and bottom nanoparticle was clearly observed. As the hybridization between nanoparticles was orientationally dependent, the vertically stacked nanoparticle dimers exhibited a unique angular dependent extinction property. Moreover, the difference of optical property between Au/SiO2/Au homo-dimers and Au/SiO2/Ag hetero-dimers was discussed. In contrast with Au/SiO2/Au homo-dimers, Fano profiles are present in Au/SiO2/Ag hetero-dimers due to the coupling between Ag dipole plasmon mode and Au interband absorption. This work offer a versatile strategy to tune the location, strength, as well as line shape of optical resonances of noble metallic nanoparticles. We believe that the plasmonic dimers obtained have both experimental and theoretical potentials in the nanophotonics realm.

Key words: Plasmonic resonance, Metallic nanoparticle dimer, Colloidal lithography

CLC Number: 

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