Abstract
It is nearly impossible to fabricate perfectly smooth nanoparticles, therefore it is important to discuss the influence of surface roughness on the optical properties of MNPs [1, 34]. Especially if e-beam lithography (see Sect. 2.10.2) is used to produce the particles, the resulting metal structures are polycrystalline and the surfaces are quite rough [2, 3]. Contrary to what one might anticipate, initial indications are that a moderate amount of surface roughness has no significant impact on the optical properties of MNP, at least in the far-field region. In [4] we show that this behavior can be interpreted as some kind of plasmonic averaging over the random height fluctuations of the rough metal surface (motional narrowing).
God made the bulk; surfaces were invented by the devil. Wolfgang Pauli
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Notes
- 1.
Typically the particle is tempered for a couple of minutes at temperatures around 200℃ on a hot plate.
- 2.
So-called finite size effects have been phenomenologically accounted for by increasing the damping rate of the conduction electrons contribution to the permittivity , see [6].
- 3.
Their implementation is based on the self-consistently solved hydrodynamic Drude model.
- 4.
This behavior is known from electron-hole pairs in semiconductor quantum wells [8], where the propagating excitons “average” over the random potential of local monolayer fluctuations, which results in a narrowing of the exciton lineshape.
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Trügler, A. (2016). Influence of Surface Roughness. In: Optical Properties of Metallic Nanoparticles. Springer Series in Materials Science, vol 232. Springer, Cham. https://doi.org/10.1007/978-3-319-25074-8_6
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