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MO: Fachverband Molekülphysik

MO 12: Poster – Novel Experimental Approaches and Novel Theoretical and Computational Approaches

MO 12.2: Poster

Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG

Disentangling Nonlinear Signal Orders in Fluorescence-Detected Multidimensional Spectroscopy via Intensity Cycling — •Vishnu E. Krishnan, Stefan Mueller, and Tobias Brixner — Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

Ultrafast spectroscopic measurements inherently include contributions from higher-order terms of the perturbation series, which can obscure the interpretation of nonlinear signals. Recently, our group demonstrated that intensity-dependent measurements (intensity cycling) enable the recovery of clean nonlinear responses in transient absorption [1] and coherently detected multidimensional spectroscopy [2]. Herein, we extend this method to fluorescence-detected multidimensional spectroscopy, using CdSe-based nanoplatelets as model samples, and successfully extract clean nonlinear signals.

[1] P. Malý, J. Lüttig, P. A. Rose, A. Turkin, C. Lambert, J. J. Krich, T. Brixner, Nature 616, 280 (2023).

[2] J. J. Krich, L. Brenneis, P. A. Rose, K. Mayershofer, S. Büttner, J. Lüttig, P. Malý, T. Brixner, J. Phys. Chem. Lett. 16, 5897 (2025).

Keywords: Higher-Order Spectroscopy; Two-Dimensional Fluorescence-Detected Spectroscopy; Multi-Exciton Interaction; Intensity Cycling; Nanocrystals