Dresden 2020 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 15: Postersession KFM
KFM 15.5: Poster
Donnerstag, 19. März 2020, 16:00–18:30, P2/1OG
Clocking nonlinear optical frequency-mixing in disordered, polar nanoparticles — •Jan Klenen1,2, Christian Kijatkin1,2, Bjoern Bourdon1,2, and Mirco Imlau1,2 — 1Department of Physics, Osnabrück University, Germany — 2Center for Cellular Nanoanalytics, Osnabrück University, Germany
Harmonic nanoparticles (HNPs) are of increasing importance due to their extended nonlinear optical (NLO) properties resulting from loosened phase matching conditions [C. Kijatkin, PhD thesis 2019] thereby enabling visionary applications in biomedicine or material science, for instance. Significant effort has been devoted to the investigation of light-matter interactions in nanoscaled media [D.S. Wiersma, Nature Photonics 2013, 7(3)]. However, the physical processes governing the temporal evolution in such media have not been fully quantified yet. Based on this premise, we present a time-resolved numerical study on pulsed laser light propagation in HNP powders using a random-walk model with Monte-Carlo based Mie calculations and evaluate its implications on NLO processes. In addition, experimental investigations of the temporal evolution of NLO sum frequency generation are performed via pump-probe spectroscopy to validate the model and to predict the behavior for different systems. We are able to analyze the effect of different particle sizes on the temporal pulse profile and discuss the potential of HNPs as a flexible alternative to crystalline media for determination of the instantaneous frequency distribution of (sub-) ps pulses. Financial support (DFG INST 190/165-1 FUGG) is gratefully acknowledged.