Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 6, Pages 739-746Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201301837
Keywords
nanoparticle arrays; hybrid materials; metamaterials; photonic crystals; gold; titanium dioxide; plasmonics
Categories
Funding
- National Science Foundation [1159552, 0853798, 0953121]
- National Institutes of Health (NIH/NCI) [5R01CA138509]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0853798, 0953121] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1159552] Funding Source: National Science Foundation
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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 morphology-dependent 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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