Structural order in plasmonic superlattices

Florian Schulz (), Ondřej Pavelka, Felix Lehmkühler, Fabian Westermeier, Yu Okamura, Niclas S. Mueller, Stephanie Reich and Holger Lange
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Florian Schulz: University of Hamburg
Ondřej Pavelka: Charles University
Felix Lehmkühler: The Hamburg Centre for Ultrafast Imaging (CUI)
Fabian Westermeier: Deutsches Elektronen-Synchrotron DESY
Yu Okamura: Freie Universität Berlin
Niclas S. Mueller: Freie Universität Berlin
Stephanie Reich: Freie Universität Berlin
Holger Lange: University of Hamburg

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract The assembly of plasmonic nanoparticles into ordered 2D- and 3D-superlattices could pave the way towards new tailored materials for plasmonic sensing, photocatalysis and manipulation of light on the nanoscale. The properties of such materials strongly depend on their geometry, and accordingly straightforward protocols to obtain precise plasmonic superlattices are highly desirable. Here, we synthesize large areas of crystalline mono-, bi- and multilayers of gold nanoparticles >20 nm with a small number of defects. The superlattices can be described as hexagonal crystals with standard deviations of the lattice parameter below 1%. The periodic arrangement within the superlattices leads to new well-defined collective plasmon-polariton modes. The general level of achieved superlattice quality will be of benefit for a broad range of applications, ranging from fundamental studies of light–matter interaction to optical metamaterials and substrates for surface-enhanced spectroscopies.

Date: 2020
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DOI: 10.1038/s41467-020-17632-4

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