Web Release Date: November 10,
Exciton-Plasmon Interaction in a Composite Metal-Insulator-Semiconductor Nanowire System
and
Contribution from Fachbereich Physik, Universität Dortmund, Otto-Hahn-Str. 4, 44227, Dortmund, Germany, and Institute for Physico-Chemical Problems of Belarussian State University, Leningradskaya Str., 14, Minsk 220080, Belarus
Received June 27, 2007
Abstract:
We report about the synthesis and optical properties of a composite metal-insulator-semiconductor nanowire system which consists of a wet-chemically grown silver wire core surrounded by
a SiO2 shell of controlled thickness, followed by an outer shell of highly luminescent CdSe nanocrystals.
With microphotoluminescence (
-PL) experiments, we studied the exciton-plasmon interaction in individual
nanowires and analyzed the spatially resolved nanocrystal emission for different nanowire length, SiO2-shell thickness, nanocrystal shape, pump power, and emission polarization. For an SiO2 spacer thickness
of ~15 nm, we observed an efficient excitation of surface plasmons by excitonic emission of CdSe
nanocrystals. For nanowire lengths up to ~10 m, the composite metal-insulator-semiconductor nanowires
((Ag)SiO2)CdSe act as a waveguide for 1D-surface plasmons at optical frequencies with efficient photon
outcoupling at the nanowire tips, which is promising for efficient exciton-plasmon-photon conversion and
surface plasmon guiding on a submicron scale in the visible spectral range.
Download the full text: PDF | HTML
