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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 31: Plasmonics & Nanooptics II: SHG and Dielectric Properties (joint session O/CPP)

O 31.7: Vortrag

Dienstag, 2. April 2019, 15:30–15:45, H8

Enhanced second harmonic emission from zinc oxide nanoparticles infiltrated into the pores of gold nanosponges — •Jue-Min Yi1, Dong Wang2, Felix Schwarz3, Jinhui Zhong1, Abbas Chimeh1, Anke Korte1, Peter Schaaf2, Erich Runge3, and Christoph Lienau11Carl von Ossietzky Universität, 26129 Oldenburg — 2TU Ilmenau,98693 Ilmenau. — 3TU Ilmenau, 98693 Ilmenau

We introduce zinc-oxide (ZnO)-functionalized porous gold (Au) nanoparticles which exhibit strong second harmonic (SH) generation around 400 nm by coupling surface plasmons (SPs) to ZnO excitons. The hybrid nanosystem consists of a thin layer (~10 nm) of ZnO incorporated into individual porous Au nanoparticles percolated with a three-dimensional (3D) network of 10-nm sized ligaments acting as nanoantennas and nanocavities.We have utilized a broadband and few-cycle ultrafast laser to generate coherent nonlinear emission from individual bare nanosponges and from ZnO-functionalized sponges. The third harmonic (TH) emission spectrum of Au/ZnO hybrid particles reveals a distinct red shift with respect to pure Au sponges. In contrast, a substantial broadening of the SH spectra and a distinct blue-shift is seen in the ZnO-functionalized nanosponges. It is demonstrated that SH emission around 400 nm, close to the ZnO band gap, is 15 times stronger with respect to bare Au nanosponges. Such enhanced SHG emission is attributed to plasmon-enhanced two-photon excitation of ZnO excitons.

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