New regimes of nanoscale thermal transport from nanostructured heat sources on diamond probed using coherent EUV beams

ORAL

Abstract

Nanostructured materials make it possible to engineer properties that are unattainable using conventional bulk materials, with applications in next-generation energy efficient devices. However, macroscopic, diffusive transport models break down at length scales comparable to a material’s dominant phonon mean free path. Moreover, there are few, if any, characterization techniques that can probe functional nanosystems. Here we use short wavelength (~30nm), ultrafast pulse (~10fs) extreme ultraviolet (EUV) beams to nondestructively probe nanoscale thermal transport in diamond. We first impulsively heat nickel nano-gratings fabricated on the diamond sample with an infrared pump laser and then extract thermal conductivity by monitoring surface relaxation with a time-delayed EUV probe. Diamond is an ideal candidate for validating emergent transport behaviors because its long phonon mean free path causes non-diffusive effects to appear at larger length scales. We compare our results to an advanced hydrodynamic transport model to isolate the contribution of viscous resistivity directly underneath the nanoheaters to thermal transport. Finally, we gain insight into non-diffusive cooling processes by examining the individual diffracted orders in the scattered EUV probe beam.

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Presenters

  • Brendan McBennett

    • STROBE and JILA, University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST

Authors

  • Brendan McBennett

    • STROBE and JILA, University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST

  • Joshua Knobloch

    • STROBE and JILA, University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST
    • University of Colorado, Boulder

  • Begoña Abad

    • STROBE and JILA, University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST

  • Travis D Frazer

    • STROBE and JILA, University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST

  • Albert Beardo

    • Departament de Física, Universitat Autònoma de Barcelona

  • Lluc Sendra

    • Departament de Física, Universitat Autònoma de Barcelona

  • Juan Camacho

    • Departament de Física, Universitat Autònoma de Barcelona

  • Javier Bafaluy

    • Departament de Física, Universitat Autònoma de Barcelona

  • Weilun Chao

    • Center for X-Ray Optics, Lawrence Berkeley National Laboratory

  • Roger Wirth Falcone

    • Department of Physics, University of California, Berkeley
    • University of California Berkeley
    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Jorge Hernández-Charpak

    • STROBE and JILA, University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST

  • Henry Kapteyn

    • JILA, University of Colorado Boulder
    • Department of Physics and JILA, University of Colorado, Boulder
    • STROBE and JILA, University of Colorado, Boulder
    • JILA and Department of Physics, University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST
    • Physics, JILA/University of Colorado Boulder
    • JILA
    • University of Colorado, Boulder
    • Physics and JILA, CU Boulder
    • JILA, University of Colorado, Boulder

  • Xavier Alvarez

    • Departament de Física, Universitat Autònoma de Barcelona

  • Margaret Murnane

    • JILA, University of Colorado Boulder
    • Department of Physics and JILA, University of Colorado, Boulder
    • STROBE and JILA, University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST
    • JILA
    • University of Colorado, Boulder
    • Physics and JILA, CU Boulder
    • University of Colorado
    • JILA, University of Colorado, Boulder