1 research outputs found
Influence of Metal Deposition on Exciton–Surface Plasmon Polariton Coupling in GaAs/AlAs/GaAs Core–Shell Nanowires Studied with Time-Resolved Cathodoluminescence
The
coupling of excitons to surface plasmon polaritons (SPPs) in
Au- and Al-coated GaAs/AlAs/GaAs core–shell nanowires, possessing
diameters of ∼100 nm, was probed using time-resolved cathodoluminescence
(CL). Excitons were generated in the metal coated nanowires by injecting
a pulsed high-energy electron beam through the thin metal films. The
Purcell enhancement factor (<i>F</i><sub>P</sub>) was obtained
by direct measurement of changes in the temperature-dependent radiative
lifetime caused by the nanowire exciton-SPP coupling and compared
with a model that takes into account the dependence of <i>F</i><sub>P</sub> on the distance from the metal film and the thickness
of the film covering the GaAs nanowires