Quantitative disentanglement of coherent and incoherent laser-induced surface deformations by time-resolved x-ray reflectivity

We present time-resolved x-ray reflectivity measurements on laser excited coherent and incoherent surface deformations of thin metallic films. Based on a kinematical diffraction model, we derive the surface amplitude from the diffracted x-ray intensity and resolve transient surface excursions with s...

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Veröffentlicht in:Applied physics letters 2017-12, Vol.111 (26)
Hauptverfasser: Sander, M., Pudell, J.-E., Herzog, M., Bargheer, M., Bauer, R., Besse, V., Temnov, V., Gaal, P.
Format: Artikel
Sprache:eng
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Zusammenfassung:We present time-resolved x-ray reflectivity measurements on laser excited coherent and incoherent surface deformations of thin metallic films. Based on a kinematical diffraction model, we derive the surface amplitude from the diffracted x-ray intensity and resolve transient surface excursions with sub-Å spatial precision and 70 ps temporal resolution. The analysis allows for decomposition of the surface amplitude into multiple coherent acoustic modes and a substantial contribution from incoherent phonons which constitute the sample heating.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5004522