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Article Dans Une Revue Optica Année : 2021

Disentangling x-ray dichroism and birefringence via high-purity polarimetry

Annika T. Schmitt
  • Fonction : Auteur
Yves Joly
Kai S. Schulze
  • Fonction : Auteur
Berit Marx-Glowna
  • Fonction : Auteur
Ingo Uschmann
  • Fonction : Auteur
Benjamin Grabiger
  • Fonction : Auteur
Hendrik Bernhardt
  • Fonction : Auteur
Robert Loetzsch
  • Fonction : Auteur
Jérôme Debray
  • Fonction : Auteur
Hans-Christian Wille
  • Fonction : Auteur
Hasan Yava
  • Fonction : Auteur
Gerhard G. Paulus
  • Fonction : Auteur
Ralf Röhlsberger
  • Fonction : Auteur

Résumé

High-brilliance synchrotron radiation sources have opened new avenues for x-ray polarization analysis that go far beyond conventional polarimetry in the optical domain. With linear x-ray polarizers in a crossed setting, polarization extinction ratios down to 10−10 can be achieved. This renders the method sensitive to probe the tiniest optical anisotropies that would occur, for example, in strong-field quantum electrodynamics due to vacuum birefringence and dichroism. Here we show that high-purity polarimetry can be employed to reveal electronic anisotropies in condensed matter systems with utmost sensitivity and spectral resolution. Taking CuO and La2CuO4 as benchmark systems, we present a full characterization of the polarization changes across the Cu K-absorption edge and their separation into dichroic and birefringent contributions. At diffraction-limited synchrotron radiation sources and x-ray lasers, where polarization extinction ratios of 10−12 can be achieved, our method has the potential to assess birefringence and dichroism of the quantum vacuum in extreme electromagnetic fields.

Dates et versions

hal-03273212 , version 1 (24-03-2020)
hal-03273212 , version 2 (29-06-2021)

Identifiants

Citer

Annika T. Schmitt, Yves Joly, Kai S. Schulze, Berit Marx-Glowna, Ingo Uschmann, et al.. Disentangling x-ray dichroism and birefringence via high-purity polarimetry. Optica, 2021, 8 (1), pp.56-61. ⟨10.1364/OPTICA.410357⟩. ⟨hal-03273212v1⟩
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