Surface plasmons and effects of losses in propagating modes in a chain of silver nanoparticles


Autoria(s): Inchausti Ezeiza, Xabier
Contribuinte(s)

Urrestilla Urizabal, Jon

Knoester, Jasper

Van Der Wal, Caspar

F. CIENCIA Y TECNOLOGIA

ZIENTZIA ETA TEKNOLOGIA F.

Grado en Física

Fisikako Gradua

Data(s)

28/04/2016

28/04/2016

28/04/2016

15/07/2015

Resumo

In this work a chain of 4000 silver nanoparticles embedded in a glass medium is considered, and its leftmost particle is excited by an electric field pulse of Gaussian shape. Considering Drude’s model, losses of the system are taken into account by γ factor, which stands for the Ohmic losses, and different quantities, such as frequencies of excited modes and group velocities are calculated. Besides, these results are compared to those obtained from the dispersion relation of an infinite chain. The increase of losses affects the lifetime and propagation length of the plasmon; besides, although the response dispersion relation for an infinite chain seems to remain invariable, this is not the case for a finite chain. The mismatches are bigger for higher losses. Furthermore, plasmon propagation velocities are analysed, and an explanation for the mismatch of longitudinal modes close to the intersection point with the dispersion of light is suggested. Finally, some concepts to treat this problem from the energy transport point of view are introduced.

Identificador

http://hdl.handle.net/10810/18103

62811-655088-09

18232-655088

Idioma(s)

eng

es

Direitos

Este trabajo está bajo Licencia Creative Commons Reconocimiento – NoComercial – CompartirIgual (by-nc-sa)

info:eu-repo/semantics/openAccess

Palavras-Chave #silver nanoparticles #Gaussian pulse propagation #surface plasmons
Tipo

info:eu-repo/semantics/bachelorThesis