Influence of surface roughness on the optical properties of plasmonic nanoparticles
2011; American Physical Society; Volume: 83; Issue: 8 Linguagem: Inglês
10.1103/physrevb.83.081412
ISSN1550-235X
AutoresAndreas Trügler, Jean‐Claude Tinguely, Joachim R. Krenn, Andreas Hohenau, Ulrich Hohenester,
Tópico(s)Metamaterials and Metasurfaces Applications
ResumoFor plasmonic nanoparticles, we investigate the influence of surface roughness inherent to top-down fabrication on the optical properties, and find that it has a surprisingly small influence on the position and width of the plasmon peaks. Our experimental observation is supported by simulations based on the boundary element method approach. Using a perturbation approach, suitable for metallic nanoparticles with a moderate degree of surface roughness, we demonstrate that the reason for this lies in motional narrowing where the plasmon averages over the random height fluctuations. Surface roughness in large arrays of identical nanoparticles, such as encountered in the context of metamaterials, is thus expected to not constitute a major roadblock.
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