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Article Dans Une Revue Optica Année : 2021

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

Yves Joly
Jérôme Debray

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 tiniest optical anisotropies that would occur, for example, in strong-field QED 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 La 2 CuO 4 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.
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Dates et versions

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

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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-03273212v2⟩
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