Bonn 2025 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 15: Interaction with VUV and X-ray Light I (joint session A/MO)
MO 15.7: Vortrag
Mittwoch, 12. März 2025, 12:30–12:45, GrHS Mathe
Measurement of resonant nuclear phase shift with a double-waveguide nano-interferometer — •Leon Merten Lohse1,2,3, Ralf Röhlsberger4,5,6,1,3, and Tim Salditt2 — 1The Hamburg Centre for Ultrafast Imaging, Hamburg — 2Georg-August-Universität Göttingen — 3Deutsches Elektronen-Synchrotron DESY, Hamburg — 4Friedrich-Schiller-Universität Jena — 5Helmholtz-Institut Jena — 6GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt
The phase of an electromagnetic wave is shifted upon scattering off atoms, coherently accumulating to result in the macroscopic index of refraction. In optical waveguides, propagating photons are spatially confined and can be coupled to resonant atoms in a controllable way. We interferometrically measured the phase shift that an ultrathin layer of 57Fe Mössbauer nuclei coherently imprints onto x-ray photons propagating through a single-mode x-ray waveguide. Using the extracted phase shift, we were able to accurately quantify the coupling strength between individual photons and nuclei. Based on this, one can envision to actively control the phase in nanophotonic devices.
Keywords: x-ray; resonance; interferometer; nuclear; waveguide