Regensburg 2025 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Poster

KFM 14.26: Poster

Wednesday, March 19, 2025, 17:00–18:30, P1

Harmonic Nanoparticles: State-of-the-knowledge and future applications — •Moritz Domack¹, Jan Klenen¹, Mirco Imlau¹, and Laura Vittadello² — ¹Inst. Physics, Barbarastr. 7, Osnabrück Univ., Germany — ²Laboratoire SYMME, 7 Chemin de Bellevue, Université Savoie Mont Blanc, France

Harmonic nanoparticles (HNPs) are receiving growing attention in anorganic chemistry, nanophotonics and life sciences due to their potential for upcoming imaging techniques. For instance, HNPs are successfully used as nanophotonics markers in the near-infrared (NIR) bio-optical windows (III) and (IV), so-called NIR-to-NIR imaging [L. Vittadello et al., Nanomaterials 11 (2021) 3193], as well as for destruction free in-vivo imaging [L. Vittadello et al., Opt. Mater. Express 11.7 (2021) 1953-1969]. HNPs are based on polar oxide nanocrystals with pronounced nonlinear optical response, such as sodium niobate (NaNbO₃) or potassium niobate (KNbO₃) and can already be synthesized at the nanometer scale (<100 nm), e.g. via hydrothermal synthesis [N. Kohlenbach et al., Nanoscale 12 (2020) 19223], but also surface-functionalized. Nonlinear Diffuse femtosecond-pulse reflectometry of powder-pressed-HNP-samples has been established as major tool for characterization of the nonlinear optical properties [C. Kijatkin et al., Photonics 4.1 (2017) 11]. We here give insight to the state-of-the-art processing routine of HNPs from synthesis, via characterization to applications and highlight upcoming fields, particularly in the framework of all-optical interrogation of cellular environments. Financial support by the DFG/RTG2900, ’nanomaterials@biomembranes’.

Keywords: microscope; nanoparticles; synthesis; second harmonic generation; biological application