Surface plasmon lifetime in metal nanoshells

Details Surface plasmon lifetime in metal nanoshells Surface plasmon lifetime in metal nanoshells

2009-08-05

arxiv.org/abs/0908.0647v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

17 pages, 3 Figures

Scientific paper

The lifetime of localized surface plasmon plays an important role in many aspects of plasmonics and its applications. In small metal nanostructures, the dominant mechanism restricting plasmon lifetime is size-dependent Landau damping. We performed quantum-mechanical calculations of Landau damping of a surface plasmon in a metal nanoshell. In contrast to the conventional picture based on the electron surface scattering, we found that the damping rate vanishes in the limit of thin nanoshell. The physical origin of this behavior is the reduced magnitude of bright surface plasmon electric field inside the metal shell. We also found that, due to electron scattering on two metal surfaces, the damping rate exhibits pronounced quantum beats with changing shell thickness.

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