Open AccessHybridized plasmon modes and near-field enhancement of metallic nanoparticle-dimer on a mirror
Author(s) -
Yu Huang,
Li Ma,
Mengjing Hou,
Jianghao Li,
Zheng Xie,
Zhengjun Zhang
Publication year - 2016
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep30011
Subject(s) - plasmon , dipole , dimer , surface plasmon resonance , wavelength , discrete dipole approximation , nanoparticle , materials science , molecular physics , field (mathematics) , metal , chemical physics , surface plasmon , electric field , optics , optoelectronics , physics , nanotechnology , nuclear magnetic resonance , mathematics , quantum mechanics , pure mathematics , metallurgy
For the attractive plasmonic structure consisting of metal nanoparticles (NPs) on a mirror, the coexistence of near-field NP-NP and NP-mirror couplings is numerically studied at normal incidence. By mapping their 3D surface charge distributions directly, we have demonstrated two different kinds of mirror-induced bonding dipole plasmon modes and confirmed the bonding hybridizations of the mirror and the NP-dimer which may offer a much stronger near-field enhancement than that of the isolated NP dimers over a broad wavelength range. Further, it is revealed that the huge near-field enhancement of these two modes exhibit different dependence on the NP-NP and NP-mirror hot spots, while both of their near-field resonance wavelengths can be tuned to the blue exponentially by increasing the NP-NP gaps or the NP-mirror separation. Our results here benifit significantly the fundamental understanding and practical applications of metallic NPs on a mirror in plasmonics.