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X-ray parametric down-conversion reveals EUV-polariton

Author

Listed:
  • Dietrich Krebs

    (Deutsches Elektronen-Synchrotron DESY
    The Hamburg Centre for Ultrafast Imaging
    Universität Hamburg)

  • Fridtjof Kerker

    (The Hamburg Centre for Ultrafast Imaging
    Universität Hamburg)

  • Xenia Brockmüller

    (Universität Hamburg)

  • Christoph J. Sahle

    (ESRF, The European Synchrotron)

  • Blanka Detlefs

    (ESRF, The European Synchrotron)

  • Simo Huotari

    (University of Helsinki)

  • Nina Rohringer

    (Deutsches Elektronen-Synchrotron DESY
    The Hamburg Centre for Ultrafast Imaging
    Universität Hamburg
    Deutsches Elektronen-Synchrotron DESY)

  • Christina Bömer

    (Deutsches Elektronen-Synchrotron DESY
    The Hamburg Centre for Ultrafast Imaging)

Abstract

Spontaneous parametric down-conversion (PDC) of photons is a gateway into the quantum realm – thoroughly studied in nonlinear optics and ubiquitously used to generate non-classical states of light. Extending PDC from the visible regime towards shorter wavelengths further enables microscopic resolution of electronic structure and quantum-enhanced X-ray detection, but remained challenging due to the process’ inherently low conversion rate. Here, we resolve the full signal cone of non-degenerate down-conversion at X-ray wavelengths and identify imprints of a polariton in the extreme ultraviolet (EUV) regime. We confirm our finding of the EUV-polariton with theoretical simulations and establish that our approach directly images the characteristic anti-crossing of polaritonic dispersion branches. This insight could open a pathway to explore strong-coupling phenomena of EUV-light-matter interaction.

Suggested Citation

  • Dietrich Krebs & Fridtjof Kerker & Xenia Brockmüller & Christoph J. Sahle & Blanka Detlefs & Simo Huotari & Nina Rohringer & Christina Bömer, 2025. "X-ray parametric down-conversion reveals EUV-polariton," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-60845-8
    DOI: 10.1038/s41467-025-60845-8
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