SKM 2021 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 5: Poster Session KFM
KFM 5.3: Poster
Dienstag, 28. September 2021, 16:00–17:00, P
Time-Resolved Nonlinear Diffuse Femtosecond-Pulse Reflectometry Using Lithium Niobate Nanoparticles with Two Pulses of Different Colors — •Jan Klenen1,2, Christian Kijatkin1,2, Björn Bourdon1,2, Laura Vittadello1,2, and Mirco Imlau1,2 — 1Department of Physics, Osnabrück University, Germany — 2Center for Cellular Nanoanalytics, Osnabrück University, Germany
In the context of biophotonics and material science, harmonic nanoparticles (HNPs) attract elevated interest owing to their versatile nonlinear optical (NLO) properties, such as their broad spectral tunability [C. Kijatkin, Photonics 2017, 4, 11]. However, the characterization of the time-evolution of light-matter interaction in such nanoscale media is yet to be completed. In this study we are using femtosecond-pulse diffuse reflectometry to investigate the time-resolved sum-frequency generation (SFG) of two differently colored, infrared femtosecond laser pulses in lithium niobate nanoparticle pellets [C. Kijatkin, Adv. Photonics Res. 2020, DOI: 10.1002/adpr.202000019]. The pulse shape of the remitted SFG shows an asymmetry in the temporal domain. This finding can be explained within the framework of light propagation in random media and is generalized on the basis of numerical simulations. As a consequence, ultrashort pulse shapes can now be comprehensively predicted in nanoscale, densely packed media with a NLO response. In this respect we discuss the potential of HNPs as a flexible alternative to crystalline media for the determination of a pulses chirp. Funded by the DFG (IM37/12-1, FOR 5044, INST 190/165-1 FUGG).