Abstract
We present a detailed theoretical analysis of the optical response of threaded plasmonic nanoparticle strings, chains of metallic nanoparticles connected by cylindrical metallic bridges (threads), based on full-electrodynamic calculations. The extinction spectra of these complex metallic nanostructures are dominated by large resonances in the near infrared, which are associated with charge transfer along the entire string. By analysing contour plots of the electric field amplitude and phase we show that such strings can be interpreted as an intermediate situation between metallic nanoparticle chains and metallic nanorods, exhibiting characteristics of both. Modifying the dielectric environment, the number of nanoparticles within the strings, and the dimensions of the threads, allows for tuning the optical response of the strings within a very broad region in the visible and near infrared.
Highlights
The field of plasmonics has experienced tremendous growth during the past decade thanks to significant advances in nanotechnology and nanofabrication
We present a detailed theoretical analysis of the optical response of threaded plasmonic nanoparticle strings, chains of metallic nanoparticles connected by cylindrical metallic bridges, based on full-electrodynamic calculations
The extinction spectra of these complex metallic nanostructures are dominated by large resonances in the near infrared, which are associated with charge transfer along the entire string
Summary
The field of plasmonics has experienced tremendous growth during the past decade thanks to significant advances in nanotechnology and nanofabrication. CTP modes can be excited in a dimer in a simpler manner, by bringing the two nanoparticles into contact [30, 33, 34] Another strategy to increase complexity and obtain a richer optical response from plasmonic nanoparticles is by designing larger aggregates of such particles. We follow a different approach, by creating gold threads, that is, cylindrical bridges of well-defined dimensions to connect the spheres in a nanoparticle string Such strings were recently fabricated by ultrafast-laser irradiation [44] of cucurbituril-assisted self-assemblies characterised by robust chain plasmon modes [41, 45]. With use of these criteria, convergence of all the results was achieved
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