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American Physical Society, Physical review B, 6(86), 2012

DOI: 10.1103/physrevb.86.064303

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Dynamics of colloidal crystals studied by pump-probe experiments at FLASH

Journal article published in 2012 by R. Dronyak, J. Gulden, O. M. Yefanov, A. Singer, T. Gorniak, T. Senkbeil, J.-M. Meijer, A. Al-Shemmary, J. Hallmann, D. D. Mai, T. Reusch, D. Dzhigaev, R. P. Kurta, U. Lorenz, A. V. Petukhov ORCID and other authors.
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This paper is available in a repository.

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Abstract

We present a time-resolved infrared (IR) pump and extreme-ultraviolet (XUV) probe diffraction experiment to investigate ultrafast structural dynamics in colloidal crystals with picosecond resolution. The experiment was performed at the FLASH facility at DESY with a fundamental wavelength of 8 nm. In our experiment, the temporal changes of Bragg peaks were analyzed and their frequency components were calculated using Fourier analysis. Periodic modulations in the colloidal crystal were localized at a frequency of about 4-5 GHz. Based on the Lamb theory, theoretical calculations of vibrations of the isotropic elastic polystyrene spheres of 400 nm in size reveal a 5.07 GHz eigenfrequency of the ground (breathing) mode. ; Comment: 12 pages, 3 figures