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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.

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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