Berlin 2024 – scientific programme
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QI: Fachverband Quanteninformation
QI 13: Poster MP (joint session MP/QI)
QI 13.3: Poster
Tuesday, March 19, 2024, 11:00–13:00, Poster B
How to model an EUV-polariton? — •Fridtjof Kerker1,2, Christina Bömer1,3, and Dietrich Krebs1,2,3 — 1The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany — 2Department of Physics - Universität Hamburg, Germany — 3Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
In recent studies of x-ray parametric down-conversion (XPDC), unexpected imprints of a polaritonic excitation in the extreme ultraviolet (EUV) regime have been revealed. While polaritons, i.e., hybridized states of light and matter, exist in numerous contexts, they are largely unexplored at short wavelengths, such as the EUV spectral range. Under these conditions, new theoretical approaches are necessary to understand the phenomenon.
In this poster presentation, we introduce a first model of the EUV-polariton, which allows us to simulate its generation inside a diamond sample during XPDC. We derive the full scattering signal according to our model and find good agreement with the experimental XPDC data. We further employ our model to analyze the coupling strength of the observed EUV-polariton and discover it to reach up to the strong-coupling regime - notably without requiring an external enhancement-cavity. Our results provide first theoretical insights into this new kind of polariton and constitute a basis for future investigations into strong EUV-light-matter coupling.
Keywords: XPDC; polariton; strong-coupling; light-matter-hybridisation