SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Poster: Ultrafast Electron Dynamics at Surface and Interfaces II
O 37.7: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Use cases for Picosecond Ultrasonics with X-rays (PUX) — •Alexander von Reppert1, Maximilian Mattern1, Steffen Zeuschner1,2, Jan-Etienne Pudell1,2,3, Marc Herzog1, and Matias Bargheer1,2 — 1Institut für Physik und Astronomie, Universität 14476 Potsdam, Potsdam, Germany — 2Helmholtz-Zentrum Berlin, 12489 Berlin, Germany — 3European XFEL, 22869 Schenefeld, Germany
Most studies of picosecond ultrasound have been and will be conducted with flexible all-optical setups, but here we discuss scenarios where ultrashort hard x-ray probe pulses excel. We focus on the extraction of the strain response from Bragg peak shifts in the symmetric diffraction condition for layered, nanoscopic structures upon excitation of metallic transducers with femtosecond laser pulses. This type of experiment can yield direct, layer-specific and quantitative information on the shape and amplitude of picosecond strain pulses and the quasi-static strain. The strain response may serve as a proxy for the local energy-density and temperature rise. The presented use-cases encompass ultrahin as well as opaque metal-heterostructures, nanostructures and negative thermal expansion materials, that each pose a challenge to established all-optical techniques.