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Area of Science:

  • Atomic, Molecular and Optical Physics
  • Condensed Matter Physics
  • Quantum Electrodynamics

Background:

  • Waveguides enable controlled coupling of atomic ensembles to electromagnetic fields.
  • Mössbauer nuclei are sensitive to their local electromagnetic environment.
  • Collective resonant excitation is crucial for coherent light-matter interactions.

Purpose of the Study:

  • To demonstrate x-ray propagation within planar thin-film waveguides.
  • To investigate collective resonant excitation of Mössbauer nuclei using synchrotron radiation.
  • To explore the potential for nanoscale coherent x-ray sources.

Main Methods:

  • Utilized planar thin-film waveguides fabricated for x-ray propagation.
  • Employed collective resonant excitation of Mössbauer nuclei with short synchrotron radiation pulses.
  • Recorded emitted x-ray photons coupled into resonant waveguide modes.

Main Results:

  • Successfully demonstrated x-ray propagation and emission into waveguide modes.
  • Observed two distinct signatures of collective emission based on geometry and excitation.
  • Developed a unifying theoretical model to explain the observed emission phenomena.

Conclusions:

  • Established a novel platform for waveguide quantum electrodynamics in the hard x-ray regime.
  • The findings pave the way for developing coherent, narrow-band x-ray sources at the nanoscale.
  • This work advances the control and manipulation of x-ray-matter interactions.