Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 25: Plasmonics and nanooptics: Light-matter interaction, spectroscopy II

O 25.1: Talk

Tuesday, March 13, 2018, 10:30–10:45, MA 041

Influence of plasmon-induced hot-electrons on the lattice dynamics of graphene — •Marcel Weinhold, Sangam Chatterjee, and Peter J. Klar — Justus Liebig University Giessen, Institute of Experimental Physics I, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany

The plasmon-induced excitation of hot-electrons holds an extraordinary potential for light harvesting up to the infrared region of the electromagnetic spectrum. Besides applications in photocatalysis, hot-carrier phenomena enable one to realize various semiconductor-based optoelectronic devices. Graphene is a promising material for utilizing plasmon-induced hot-electrons formed in gold nanoparticles. Since lattice dynamics have a major impact on the transport properties it is important to investigate the influence of gold nanostructures and the injected hot-carriers on graphene`s vibrational modes.Therefore, we performed Raman-mappings across individual spherical gold nanoparticles deposited on graphene to both, generate hot-carriers in case of plasmon resonance and determine the corresponding Raman-spectra in order to obtain information on the change in lattice dynamics. We observe a systematic shift in the measured phonon-frequencies related to a coupling between the electronic and phononic system correlating with the applied laser power.