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Diffuse Surface Scattering in the Plasmonic Resonances of Ultralow Electron Density Nanospheres

R. C. Monreal ; T. J. Antosiewicz ; S. Peter Apell (Institutionen för teknisk fysik)
Journal of Physical Chemistry Letters (1948-7185). Vol. 6 (2015), 10, p. 1847-1853.
[Artikel, refereegranskad vetenskaplig]

Localized surface plasmon resonances (LSPRs) have recently been identified in extremely diluted electron systems obtained by doping semiconductor quantum dots. Here, we investigate the role that different surface effects, namely, electronic spill-out and diffuse surface scattering, play in the optical properties of these ultralow electron density nanosystems. Diffuse scattering originates from imperfections or roughness at a microscopic scale on the surface. Using an electromagnetic theory that describes this mechanism in conjunction with a dielectric function including the quantum size effect, we find that the LSPRs show an oscillatory behavior in both position and width for large particles and a strong blue shift in energy and an increased width for smaller radii, consistent with recent experimental results for photodoped ZnO nanocrystals. We thus show that the commonly ignored process of diffuse surface scattering is a more important mechanism affecting the plasmonic properties of ultralow electron density nanoparticles than the spill-out effect.



Denna post skapades 2015-06-29.
CPL Pubid: 219035

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik (1900-2015)

Ämnesområden

Fysik

Chalmers infrastruktur