Thermal transport from nanostructured heat sources on diamond probed using coherent extreme ultraviolet beams

ORAL

Abstract

Nanostructured materials can exhibit properties unattainable in bulk materials, with applications in next-generation energy efficient devices. However, macroscopic, diffusive transport models break down at length scales comparable to the mean free path of a material’s dominant heat carriers. Moreover, there are few characterization techniques that can probe functional nanosystems. Here, we use short wavelength (~30nm), ultrafast (~10fs) extreme ultraviolet (EUV) beams to nondestructively probe thermal transport away from nanoscale heat sources on diamond. Diamond is a promising material for diodes, high strength coatings, and integrated circuits—and is of special interest for quantum communication and memory. We impulsively heat nickel nano-gratings fabricated on a diamond substrate with an infrared pump laser and quantify the heat transport efficiency by monitoring the surface deformation using a time-delayed EUV probe. We use our experimental results to develop and validate a predictive hydrodynamic transport model and investigate the respective roles played by diamond’s intrinsic scattering environment and the nickel-diamond interface. Additionally, we spatially analyze non-diffusive cooling processes using individual diffracted orders in the scattered EUV probe.

*STROBE NSF STC

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Presenters

  • Brendan McBennett

    • University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST, Boulder, CO 80309, USA

Authors

  • Brendan McBennett

    • University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST, Boulder, CO 80309, USA

  • Joshua L Knobloch

    • University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST, Boulder, CO 80309, USA

  • Begoña Abad

    • STROBE and JILA, University of Colorado and NIST, Boulder, CO 80309, USA

  • Travis D Frazer

    • STROBE and JILA, University of Colorado and NIST, Boulder, CO 80309, USA

  • Albert Beardo

    • Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia, Spain

  • Lluc Sendra

    • Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia, Spain

  • Juan Camacho

    • Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia, Spain

  • Javier Bafaluy

    • Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia, Spain

  • Weilun Chao

    • Center for X-Ray Optics, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

  • roger falcone

    • Department of Physics, University of California, Berkeley, California 94720, USA

  • Jorge Nicolas Hernandez Charpak

    • STROBE and JILA, University of Colorado and NIST, Boulder, CO 80309, USA

  • Henry C Kapteyn

    • University of Colorado, Boulder
    • JILA
    • JILA, University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST, Boulder, CO 80309, USA

  • Xavier Alvarez

    • Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia, Spain

  • Margaret Murnane

    • University of Colorado, Boulder
    • JILA
    • JILA, University of Colorado, Boulder
    • STROBE and JILA, University of Colorado and NIST, Boulder, CO 80309, USA
    • STROBE, JILA and Physics, University of Colorado