Ultrashort-pulse laser ablation of nanocrystalline aluminum

Gill-Comeau, Maxime; Lewis, Laurent J.

doi:10.1103/physrevb.84.224110

Cited by 30 publications

(6 citation statements)

References 68 publications

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“…13 The analysis of the effect of the spatial confinement on the kinetics and mechanisms of laser-induced phase transformation, as well as the structural modification of the metal target, however, is beyond the capabilities of the continuum-level finite difference 14 or finite element method 4,13 calculations. On the other hand, the atomistic molecular dynamics (MD) simulations, while more computationally expensive, have been shown to a) be capable of providing detailed information on the fast nonequilibrium structural and phase transformations induced by short pulse laser irradiation of thin films [15][16][17][18][19][20][21] and bulk targets [21][22][23][24][25][26][27][28][29] under vacuum conditions or in the presence of background gas. 30 In this paper, we report the results of the first MD simulations aimed at investigation of the mechanisms and kinetics of rapid laser-induced phase transformations in a bulk metal target covered by a thick transparent overlayer.…”

Section: Introductionmentioning

confidence: 99%

Atomistic simulation study of short pulse laser interactions with a metal target under conditions of spatial confinement by a transparent overlayer

Karim

Shugaev

et al. 2014

Journal of Applied Physics

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The distinct characteristics of short pulse laser interactions with a metal target under conditions of spatial confinement by a solid transparent overlayer are investigated in a series of atomistic simulations. The simulations are performed with a computational model combining classical molecular dynamics (MD) technique with a continuum description of the laser excitation, electronphonon equilibration, and electronic heat transfer based on two-temperature model (TTM). Two methods for incorporation of the description of a transparent overlayer into the TTM-MD model are designed and parameterized for Ag-silica system. The material response to the laser energy deposition is studied for a range of laser fluences that, in the absence of the transparent overlayer, covers the regimes of melting and resolidification, photomechanical spallation, and phase explosion of the overheated surface region. In contrast to the irradiation in vacuum, the spatial confinement by the overlayer facilitates generation of sustained high-temperature and highpressure conditions near the metal-overlayer interface, suppresses the generation of unloading tensile wave, decreases the maximum depth of melting, and prevents the spallation and explosive disintegration of the surface region of the metal target. At high laser fluences, when the laser excitation brings the surface region of the metal target to supercritical conditions, the confinement prevents the expansion and phase decomposition characteristic for the vacuum conditions leading to a gradual cooling of the hot compressed supercritical fluid down to the liquid phase and eventual solidification. The target modification in this case is limited to the generation of crystal defects and the detachment of the metal target from the overlayer. V

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Section: Introductionmentioning

confidence: 99%

Atomistic simulation study of short pulse laser interactions with a metal target under conditions of spatial confinement by a transparent overlayer

Karim

Shugaev

et al. 2014

Journal of Applied Physics

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“…Molecular dynamics simulations built on the model have namely delivered numerous insightful results for metals on the laser-induced phase transitions, material restructuring and mass transfer (see e.g. [150][151][152][153][154][155][156][157]). The introduction of the multi-plasma model in Section 3.1 needs to be understood as our proposal to extend the two-temperature model to a multi-temperature model.…”

Section: Thermalization Mechanisms -Relaxation Therapy For Materialsmentioning

confidence: 99%

Laser-induced excitation mechanisms and phase transitions in spectrochemical analysis – Review of the fundamentals

Vanraes

Bogaerts

2021

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…39,40 In this approach, the MD part is responsible for handling the forces among the atoms at all times during the simulations. The TTM part, on the other hand, uses the coupling of electrons and phonons in order to calculate the transfer and diffusion of the energy to the lattice, during and after irradiation.…”

Section: Theoretical Modelmentioning

confidence: 99%

Ultrashort laser ablation of bulk copper targets: Dynamics and size distribution of the generated nanoparticles

Tsakiris

Anoop

Ausanio

et al. 2014

Journal of Applied Physics

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We address the role of laser pulse fluence on expansion dynamics and size distribution of the nanoparticles produced by irradiating a metallic target with an ultrashort laser pulse in a vacuum, an issue for which contrasting indications are present in the literature. To this end, we have carried out a combined theoretical and experimental analysis of laser ablation of a bulk copper target with 50 fs, 800 nm pulses, in an interval of laser fluencies going from few to several times the ablation threshold. On one side, molecular dynamics simulations, with two-temperature model, describe the decomposition of the material through the analysis of the evolution of thermodynamic trajectories in the material phase diagram, and allow estimating the size distribution of the generated nanoaggregates. On the other side, atomic force microscopy of less than one layer nanoparticles deposits on witness plates, and fast imaging of the nanoparticles broadband optical emission provide the corresponding experimental characterization. Both experimental and numerical findings agree on a size distribution characterized by a significant fraction (90%) of small nanoparticles, and a residual part (10%) spanning over a rather large size interval, evidencing a weak dependence of the nanoparticles sizes on the laser pulse fluence. Numerical and experimental findings show a good degree of consistency, thus suggesting that modeling can realistically support the search for experimental methods leading to an improved control over the generation of nanoparticles by ultrashort laser ablation

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Ultrashort-pulse laser ablation of nanocrystalline aluminum

Cited by 30 publications

References 68 publications

Atomistic simulation study of short pulse laser interactions with a metal target under conditions of spatial confinement by a transparent overlayer

Atomistic simulation study of short pulse laser interactions with a metal target under conditions of spatial confinement by a transparent overlayer

Laser-induced excitation mechanisms and phase transitions in spectrochemical analysis – Review of the fundamentals

Ultrashort laser ablation of bulk copper targets: Dynamics and size distribution of the generated nanoparticles

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