Rational Assembly of Optoplasmonic Hetero-nanoparticle Arrays with Tunable Photonic-Plasmonic Resonances

Advanced Functional Materials
Yan HongBjörn M Reinhard

Abstract

Metallic and dielectric nanoparticles (NPs) have synergistic electromagnetic properties but their positioning into morphologically defined hybrid arrays with novel optical properties still poses significant challenges. A template-guided self-assembly strategy is introduced for the positioning of metallic and dielectric NPs at pre-defined lattice sites. The chemical assembly approach facilitates the fabrication of clusters of metallic NPs with interparticle separations of only a few nanometers in a landscape of dielectric NPs positioned hundreds of nanometers apart. This approach is used to generate two-dimensional interdigitated arrays of 250 nm diameter TiO2 NPs and clusters of electromagnetically strongly coupled 60 nm Au NPs. The morphologydependent near- and far-field responses of the resulting multiscale optoplasmonic arrays are analyzed in detail. Elastic and inelastic scattering spectroscopy in combination with electromagnetic simulations reveal that optoplasmonic arrays sustain delocalized photonic-plasmonic modes that achieve a cascaded E-field enhancement in the gap junctions of the Au NP clusters and simultaneously increase the E-field intensity throughout the entire array.

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Citations

Jan 2, 2019·Materials·Andrey K SarychevGrégory Barbillon
Apr 4, 2019·Advanced Materials·Joshua D SpitzbergAmit Meller
Mar 7, 2016·Optics Express·Yu LiuJinglei Du
Aug 10, 2017·Optics Express·Andrey LagarkovAndrey K Sarychev
Jan 27, 2019·Scientific Reports·Yuanhui ZhengUdo Bach
Aug 13, 2015·The Journal of Physical Chemistry Letters·Yan HongBjörn M Reinhard
Jul 30, 2015·Journal of the American Chemical Society·Deyu LiuGalen D Stucky
Aug 20, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Suxia HouSheng Yan

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