高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (8): 2374.doi: 10.7503/cjcu20210289

• 无机化学 • 上一篇    下一篇

均一取向等离子体二聚体的制备及光学机理

王昭一1,2, 穆世林2, 张学民3(), 张俊虎2()   

  1. 1.吉林大学中日联谊医院, 长春 130031
    2.吉林大学化学学院超分子结构与材料国家重点实验室, 长春 130012
    3.东北大学理学院, 沈阳 110819
  • 收稿日期:2021-04-26 出版日期:2021-08-10 发布日期:2021-08-05
  • 通讯作者: 张俊虎 E-mail:zhangxuemin@mail.neu.edu.cn;zjh@jlu.edu.cn
  • 作者简介:张学民, 男, 博士, 副教授, 主要从事金属微结构及光电功能材料研究. E-mail: zhangxuemin@mail.neu.edu.cn
  • 基金资助:
    国家自然科学基金(21975098);中国博士后科学专项基金(2020T130042ZX)

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)

摘要:

以单层SiO2胶体微球为模板, 利用Au/SiO2/Au交替沉积结合后退火处理的方法, 制备了一种垂直堆叠且均一取向的等离子体二聚体结构. 该方法具有很大的自由度, 可以通过调节实验流程来制备大面积取向相同的同质或异质纳米粒子二聚体. 所制备的纳米粒子的等离子体杂化效应明显, 在消光光谱中可以观察到成键及反键共振峰. 由于所得纳米粒子二聚体具有垂直堆叠的特殊规整取向, 还可以观察到所得样品等离子体吸收峰的角度依赖特性. 此外, 还探讨了Au/SiO2/Au同质二聚体和Au/SiO2/Ag异质二聚体的光学特性差异, 发现与Au/SiO2/Au同质二聚体相比, Au/SiO2/Ag异质二聚体由于Ag偶极等离子体模式与Au带间吸收的耦合而呈现Fano共振峰. 所得结果提供了一个调节贵金属等离子体光学共振峰位、 强度和波形的策略, 在纳米光子学领域有着广阔的应用前景, 对今后的实验和理论研究具有重要参考价值.

关键词: 等离子体共振, 金属纳米粒子二聚体, 胶体刻蚀

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

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