Plasmonic Nanolenses: Electrostatic Self-Assembly of Hierarchical Nanoparticle Trimers and Their Response to Optical and Electron Beam Stimuli

Asymmetric nanoparticle trimers composed of particles with increasing diameter act as “plasmonic lenses” and have been predicted to exhibit ultrahigh confinement of electromagnetic energy in the space between the two smallest particles. Here we present an electrostatic self-assembly approach for cre...

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Bibliographic Details
Published in:ACS nano 2017-02, Vol.11 (2), p.1604-1612
Main Authors: Lloyd, Julian A, Ng, Soon Hock, Liu, Amelia C. Y, Zhu, Ye, Chao, Wei, Coenen, Toon, Etheridge, Joanne, Gómez, Daniel E, Bach, Udo
Format: Article
Language:English
Subjects:
Assembly
Electron energy loss spectroscopy
Electrostatics
Gold
Nanostructure
Particle physics
Self assembly
Trimers
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Summary:Asymmetric nanoparticle trimers composed of particles with increasing diameter act as “plasmonic lenses” and have been predicted to exhibit ultrahigh confinement of electromagnetic energy in the space between the two smallest particles. Here we present an electrostatic self-assembly approach for creating gold nanoparticle trimers with an assembly yield of over 60%. We demonstrate that the trimer assembly leads to characteristic red-shifts and show the localization of the relevant plasmon modes by means of cathodoluminescence and electron energy loss spectroscopy. The results are analyzed in terms of surface plasmon hybridization.
ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.6b07336