4.6 Article

Influence of surface roughness on the optical properties of plasmonic nanoparticles

期刊

PHYSICAL REVIEW B
卷 83, 期 8, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.081412

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  1. Austrian Science Fund FWF [P21235-N20]
  2. Austrian Science Fund (FWF) [P21235] Funding Source: Austrian Science Fund (FWF)

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For 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 that encountered in the context of metamaterials, is thus expected to not constitute a major roadblock.

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