Journal Article

PUBDB-2023-04098

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png X-ray parametric down-conversion reveals EUV-polariton

Krebs, D. (Corresponding author)CFEL*XFEL.EU*DESY* ; Kerker, F.Extern* ; Brockmueller, X.Extern* ; Sahle, C.Extern* ; Detlefs, B. ; Huotari, S.Extern*XFEL.EU* ; Rohringer, N.XFEL.EU*DESY* ; Boemer, C. (Corresponding author)DESY*

2025
Springer Nature [London]

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Please use a persistent id in citations: doi:10.1038/s41467-025-60845-8  doi:10.3204/PUBDB-2023-04098

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.

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Contributing Institute(s):

1. FS-Photon Science (FS-PS)
2. Theoretical ultrafast X-ray science (FS-TUX)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. AIM, DFG project G:(GEPRIS)390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)
3. SCORE - Scalable and Complete Ontology Reasoning (303914) (303914)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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