A generalized thermo-elastodynamic model applicable to investigating single- and polycrystalline metallic films for their coupled thermal-mechanical responses to ultrafast laser heating is presented. Built upon the two-temperature model, the governing field equations feature hyperbolic electron and lattice energy transports that admit finite propagation speed and incorporate a term of energy dissipation to the generation of thermally induced mechanical disturbance. Electron energy transport in polycrystalline thin film is investigated in-depth by considering temperature dependence and size effect due to film surface and grain boundary scattering. Numerical results generated using the generalized one-dimensional model for a single-crystalline gold film are favorably examined against published experimental data for validation. Several averaged grain diameters are considered to explore the coupled thermal-mechanical responses in polycrystalline gold films of different thicknesses to better understand the dynamics and size effect on energy transport subject to pulsed femtosecond laser.


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    Title :

    Generalized Thermo-Elastodynamics for Polycrystalline Metallic Thin Films in Response to Ultrafast Laser Heating


    Contributors:
    Mao, Xu (author) / Steve Suh, C. (author)

    Published in:

    Publication date :

    2019-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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