Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 41: Nanoparticles and Composite Materials
CPP 41.6: Vortrag
Donnerstag, 3. April 2014, 10:45–11:00, ZEU 222
Temperature Dependent Luminescence and Dephasing of Gold Nanorods — •Alexander Konrad1, Frank Wackenhut1, Martin Hussels1, Alfred J. Meixner1, and Marc Brecht1,2 — 1Universität Tübingen, IPTC, 72076 Tübingen, Germany — 2Zürcher Hochschule für Angewandte Wissenschaften, IAMP, 8401 Winterthur, Switzerland
The one-photon luminescence of noble metal nanoparticles is a well known phenomenon, but its underlying physics is not yet completely understood. The reason for the common use of nanoparticles in optics is lying in their ability to exhibit plasmons, which are responsible for a large scattering cross section of nanoparticles and probably also partly for their photoluminescence. Quantifying plasmons is possible spectroscopically by their resonance frequency and dephasing time, depending on intrinsic and extrinsic properties. We present measurements of the one-photon luminescence emitted by single gold nanorods (GNR) to propose its causally underlying processes. Therefore, we determined the resonance frequency and dephasing times of single GNRs as a function of temperature from ambient down to cryogenic temperatures (295K-1.6K) and assumed the plasmon as a Lorentzian oscillator. The determined increase of the dephasing times with decreasing temperature follows a simple Debye-model for electrons and phonons in bulk materials confirming the plasmonic origin of the one-photon luminescence. The temperature independent contributions for dephasing are assigned mainly to the processes: electron-electron-scattering, electron-surface-scattering and radiative damping.