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MO: Fachverband Molekülphysik
MO 15: Interaction with strong or short laser pulses I (joint session A/MO)
MO 15.6: Vortrag
Mittwoch, 4. März 2026, 16:00–16:15, N 2
High-harmonic generation in an organic molecular crystal — •Falk-Erik Wiechmann1,2, Samuel Schöpa1, Lina Marie Bielke1, Svenja Rindelhardt1, Serguei Patchkovskii3, Felipe Morales3, Maria Richter3, Dieter Bauer1,2, and Franziska Fennel1,2 — 1Intitute of physics, University of Rostock, 18059 Rostock, Germany — 2Department of Life, Light and Matter, University of Rostock, 18059 Rostock — 3Max Born Institute (MBI) for Nonlinear Optics and Short Pulse Spectroscopy, 12489 Berlin, Germany
Recently, organic molecular crystals (OMCs) were introduced as a novel target class for high-harmonic generation (HHG)[1], bridging the gap between gas-phase and solid-state targets. In OMCs, neighboring molecules experience a weak van-der-Waals coupling, which leads to solid like features, e.g. a delocalization of the electronic states over several unit cells. The perfect inherent alignment of all molecules makes OMCs an ideal target class for high-harmonic spectroscopy of large organic molecules, as it avoids the need for extremely challenging alignment techniques that have so far prevented corresponding measurements in the gas phase. With a fundamental 4000 nm mid-IR beam reaching 0.99 TW/cm2 we demonstrate that HHG from Pentacene crystals is possible without imposing physical damage. Measurements of the harmonic yield as a function of the driving polarization direction reveal that the harmonic generation process is driven by intermolecular effects and not by the response of non-interacting aligned molecules. [1] Wiechmann, FE. et al., Nat. Commun. 16, 9890 (2025)
Keywords: High harmonic generation; Organic molecular crystals; Pentacene; Intermolecular coupling; Polarization dependence