Bonn 2025 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 29: Cluster and Nanoparticles II (joint session MO/A)

MO 29.6: Vortrag

Freitag, 14. März 2025, 12:30–12:45, HS XV

Broadband Femtosecond Transient Absorption Microscopy — •Magnus Frank, Chris Rehhagen, and Stefan Lochbrunner — Institute for Physics and Department of Life, Light and Matter, University of Rostock, 18051 Rostock, Germany

Organic crystalline micro- and nanostructures have become of great interest in the field of semiconductors and optoelectronics. In these applications the exciton dynamics play an important role and can determine the suitability of a certain structure. Femtosecond pump probe spectroscopy is the standard method for characterising exciton dynamics but its adoption for use on organic micro- and nanostructures is not without challenge. The main problem is increasing the spatial resolution to a level that a specific structure can be studied while maintaining a high signal to noise ratio. Additionally, tightly focussing spectrally broad light represents another challenge as chromatically compensated optics cannot be used with fs laser pulses. It is for these reasons that typically only single colour experiments are conducted.

In this work we present a transient absorption microscope that is capable of resolving singular nanostructures. We are able to reach a spatial resolution lower than 1 μm and a sub-100 fs time resolution while managing to cover nearly the whole visible spectrum as well as parts of the NIR.

Keywords: Microscopy; Transient Absorption; Ultrafast Spectroscopy; Time Resolved; Organic Crystals