Independent engineering of individual plasmon modes in plasmonic dimers with conductive and capacitive coupling

Nanophotonics

article

Vlastimil Křápek¹  Martin Hrtoň¹  Jiří Babocký¹  Tomáš Šikola¹  Andrea Konečná³  Michal Horák¹  Filip Ligmajer¹  Michael Stöger-Pollach⁴ 

[1] Central European Institute of Technology, Brno University of Technology;Institute of Physical Engineering, Brno University of Technology;Materials Physics Center CSIC-UPV/EHU;University Service Centre for Transmission Electron Microscopy, Vienna University of Technology

关键词: plasmonics;    localised surface plasmons;    electron energy loss spectroscopy;    Babinet’s principle;    hot spot;   

DOI  :  10.1515/nanoph-2019-0326

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

We revisit plasmon modes in nanoparticle dimers with conductive or insulating junction resulting in conductive or capacitive coupling. In our study, which combines electron energy loss spectroscopy, optical spectroscopy, and numerical simulations, we show the coexistence of strongly and weakly hybridised modes. While the properties of the former ones strongly depend on the nature of the junction, the properties of the latter ones are nearly unaffected. This opens up a prospect for independent engineering of individual plasmon modes in a single plasmonic antenna. In addition, we show that Babinet’s principle allows to engineer the near field of plasmon modes independent of their energy. Finally, we demonstrate that combined electron energy loss imaging of a plasmonic antenna and its Babinet-complementary counterpart allows to reconstruct the distribution of both electric and magnetic near fields of localised plasmon resonances supported by the antenna, as well as charge and current antinodes of related charge oscillations.

【 授权许可】

CC BY