Erlangen 2018 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 9: Atomic Clusters II (joint session A/MO)

MO 9.8: Vortrag

Dienstag, 6. März 2018, 15:45–16:00, K 2.016

Signatures of Rabi cycling and excited state population dynamics in single-shot coherent diffractive imaging — •Björn Kruse1, Christian Peltz1, and Thomas Fennel1,21University of Rostock, Albert-Einstein-Straße 23, D-18059 Rostock, Germany — 2Max-Born-Institute, Max-Born-Straße 2A, D-12489 Berlin, Germany

Only recently, coherent single-shot diffractive imaging (CDI) of individual free nanoparticles has been demonstrated with a laser-based source using high harmonic generation [1], promising new applications and unprecedented insights into the ultrafast dynamics induced or probed via the single-shot scattering process. So far, CDI experiments have been analyzed via an effective classical linear response description, e.g. to reconstruct the shape and orientation of nanoparticles [2]. For strong laser fields and in particular for resonant excitations, both the linear and the classical description may no longer be valid as population depletion and stimulated emission become important. To what extent such processes may influence CDI scattering images is currently largely unknown. In our theoretical analysis, we describe the quantum-mechanical few-level bound state dynamics using a density matrix formalism and incorporate this into a 3D Maxwell solver based on the finite-difference time-domain method (FDTD). We discuss how and to which extend the spatio-temporal population dynamics influences the scattering images and analyze the observed trends.

[1] D. Rupp et al., Nat. Commun. 8, 493 (2017)

[2] I. Barke et al., Nat. Commun. 6, 6187 (2015)

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