Abstract
Plasmonic nanoparticle assemblies are a materials platform in which optical modes, resonant frequencies, and near-field intensities can be specified by the number and position of nanoparticles in a cluster. A current challenge is to achieve clusters with higher yields and new types of shapes. In this Letter, we show that a broad range of plasmonic nanoshell nanoclusters can be assembled onto a lithographically defined elastomeric substrate with relatively high yields using templated assembly. We assemble and measure the optical properties of three cluster types: Fano-resonant heptamers, linear chains, and rings of nanoparticles. The yield of heptamer clusters is measured to be over 30%. The assembly of plasmonic nanoclusters on an elastomer paves the way for new classes of plasmonic nanocircuits and colloidal metamaterials that can be transfer-printed onto various substrate media.
Highlights
Plasmonic nanoparticle assemblies are a materials platform in which optical modes, resonant wavelengths, and near-field intensities can be specified by the number and position of nanoparticles in a cluster
Close-packed clusters ranging from dimers and trimers to small aggregates were assembled, and the yield for any particular cluster type was small
The clusters assembled at random positions on a substrate, and the only way to identify individual clusters was to examine the substrate over a wide area using electron microscopy
Summary
Plasmonic nanoparticle assemblies are a materials platform in which optical modes, resonant wavelengths, and near-field intensities can be specified by the number and position of nanoparticles in a cluster. With the processing parameters above, clusters are assembled on substrates comprising a range of void geometries, and optical scattering measurements are performed on individual clusters using a near-normal dark-field illumination technique described in Ref.
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