Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 33: Nanostructures at Surfaces: Metals, Oxides and Semiconductors I

O 33.3: Vortrag

Dienstag, 21. März 2017, 11:00–11:15, REC/PHY C213

Multi-photon luminescence of single gold nanoparticles: Exploring the dynamics of plasmons and electron hole pairs — •Frank Wackenhut, Xiao Wang, and Alfred J. Meixner — Eberhard Karls University, Institute of Physical and Theoretical Chemistry, Tübingen, Germany

We utilize non linear excitation to investigate the optical properties of single gold nanoparticles and report on efficient two and three photon luminescence emission based on the excitation of electron hole pairs. Furthermore, we show that the emission of the same gold nanoparticle strongly depends on the excitation conditions and can be controlled by changing the excitation pulse duration from 500 fs to 100 fs. Additionally we are using single gold nanorods with different aspect ratios to investigate the interplay between the particle plasmon and electron hole pairs, which enables us to develop a quantitative model to fully describe the two and three photon luminescence emission of single gold nanoparticles. These findings greatly increase the understanding of the physical processes underlying the luminescence of gold and hence help to increase the usefulness of gold nanoparticles in various application fields, e.g. in material science, bio imaging, microscopy and spectroscopy.