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Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Plasmonics II (joint session O/CPP)

CPP 27.8: Vortrag

Dienstag, 2. April 2019, 15:45–16:00, H8

Revealing Plasmon-Exciton Coupling for SHG Enhancement by Interferometric Frequency Resolved Autocorrelation — •Jinhui Zhong1, Juemin Yi1, Dong Wang2, Anke Korte1, Abbas Chimeh1, Peter Schaaf2, and Christoph Lienau11Institute of Physics, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany — 2Institut für Mikro- und Nanotechnologien MacroNano and Institut für Werkstofftechnik, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Plasmon-enhanced excitonic nonlinear emission from semiconductors is interesting because the coupling of plasmon and exciton may boost the nonlinear generation efficiency. Nevertheless, to date, a detailed characterization of the electron dynamics of metal(plasmon)-semiconductor(exciton) composites is lacking. Herein, we present interferometric frequency-resolved autocorrelation (IFRAC) measurements on individual porous gold nanoparticles (nanosponges) incorporated with ZnO that allows us to track spectrally and temporally the response of the generated second-harmonic fields. We propose a method to distinguish homogeneous and inhomogeneous spectral broadening of plasmon resonances by Fourier-transform of the IFRAC traces to get two-dimensional (2D) IFRAC spectra. More importantly, we observed enhanced excitonic SHG emission at 390 nm from ZnO by coupling to localized plasmons of gold nanosponges. Pronounced features of coherent plasmon coupling are observed, proving that localized plasmons enhance the nonlinear ZnO excitonic emission, as revealed from the fundamental (FM) sidebands of the 2D spectra.

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