High-Frequency Surface Acoustic Wave Propagation in Nanostructures Characterized by Coherent Extreme Ultraviolet Beams

ORAL

Abstract

We study ultrahigh frequency surface acoustic wave propagation in nickel-on-sapphire nanostructures. We make use of high-order harmonic generation to obtain ultrafast, coherent, beams in the extreme ultraviolet (EUV) region of the spectrum. The short wavelengths $\sim $30 nm allow us to measure propagation dynamics of surface acoustic waves to frequencies of nearly 50 GHz, corresponding to wavelengths as short as 125 nm. We repeat the measurement on a sequence of nanostructured samples to quantify dispersion of surface acoustic waves in a nanostructure series for the first time [1]. These measurements are critical for accurate characterization of interfaces beneath very thin films using this technique. [1] M. E. Siemens, et al. Applied Physics Letters, 94(9):093103, 2009.

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Authors

  • Mark Siemens

    JILA, University of Colorado at Boulder, Department of Physics and JILA, University of Colorado, Boulder CO

  • Qing Li

    Department of Physics and JILA, University of Colorado, Boulder CO

  • Keith Nelson

    Department of Chemistry, MIT, Department of Chemistry, Massachusetts Institute of Technology, Cabridge MA

  • Ronggui Yang

    Department of Mechanical Engineering, University of Colorado at Boulder, Department of Mechanical Engineering, University of Colorado, Boulder CO

  • Erik Anderson

    Lawrence Berkeley Labs and Center for X-Ray Optics, Center for X-ray Optics and Lawrence Berkeley Laboratories, Berkeley CA

  • Margaret Murnane

    Department of Physics and JILA, University of Colorado, Boulder CO

  • Henry Kapteyn

    Department of Physics and JILA, University of Colorado, Boulder CO