Comments on explosive mechanisms of laser sputtering

Kelly, Roger; Miotello, A.

doi:10.1016/0169-4332(95)00481-5

Cited by 295 publications

(152 citation statements)

References 27 publications

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“…For high nucleation rates, the liquid can rapidly decompose into an equilibrium mixture of liquid droplets and monomers; in this case one speaks of phase explosion. This process is widely considered to be a common ablation process in the ultrashort pulse regime [8,[10][11][12][25][26][27]. However, a clear evidence of its occurrence still lacks.…”

Section: Homogeneous Nucleationmentioning

confidence: 99%

“…On a microscopic scale, these include: dielectric breakdown in transparent solids, [1] change of optical and electronic properties, [2] nonthermal melting of covalent materials, [3] and semiconductorto-metal transitions. [4] On a mesoscopic scale, the pressure wave generation, [5][6][7] the thermodynamical evolution of the expanding matter, [8,9] and the identification of the collective ejection processes [8,[10][11][12][13][14][15][16][17]] must all be understood in order to provide a complete picture of the phenomenon. Clearly, a complete microscopic description of the ablation process is out of reach of present models.…”

Section: Introductionmentioning

confidence: 99%

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Molecular-dynamics study of ablation of solids under femtosecond laser pulses

2003

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We study the mechanisms of ablation of solids under femtosecond laser pulses using a two-dimensional molecular-dynamics model. By using a novel method to obtain the thermodynamic relaxation path of different sections of the target in the phase diagram, it is shown that four mechanisms can account for ablation for fluences (energy injected per unit surface) under the threshold for plasma formation: (i) spallation resulting from the loss of stability of the solid target following the passage of a tensile pressure wave; (ii) phase explosion resulting from important homogeneous nucleation of gas bubbles inside a superheated, metastable liquid; (iii) fragmentation of a highly strained supercritical fluid; and (iv) complete vaporization of the surface layers of the target. As many as three of these mechanisms can be active at the same time, inducing ablation of material at different depths under the surface of the sample. The occurrence of these mechanisms is linked to the characteristics of the thermodynamic relaxation path followed by the material after the absorption of the laser pulse. Nousétudions les mécanismes d'ablation des solides par des impulsions laser femtosecondes en utilisant un

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Section: Homogeneous Nucleationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molecular-dynamics study of ablation of solids under femtosecond laser pulses

2003

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“…[136][137][138][139][140][141] As discussed in detail by Kelly and Miotello, 138-140 short pulse laser irradiation can overheat a part of the absorbing region beyond the limit of thermodynamic stability of the target material, leading to the onset of intense temperature, pressure, and density fluctuations. The fluctuations in the thermodynamically unstable material do not disappear but grow, leading to a rapid phase transition of the overheated material into a mixture of gas phase molecules and liquid droplets.…”

Section: B Overheating and Phase Explosionmentioning

confidence: 99%

Computer Simulations of Laser Ablation of Molecular Substrates

Zhigilei

Leveugle

Garrison³

et al. 2003

Chem. Rev.

279

248

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“…(ii) Pulse duration is also an important parameter for the generation of nanoparticles. By changing the pulse duration from nanoseconds (ns) to picoseconds (ps) toward femtoseconds (fs), the ablation mechanism changes from melting and thermal evaporation to phase explosion [19,20]. The shorter the pulse duration, the more efficient the ablation process, including a nearly instantaneous evaporation with a minimized heat affected zone [21].…”

Section: Introductionmentioning

confidence: 99%

Influence of processing time on nanoparticle generation during picosecond-pulsed fundamental and second harmonic laser ablation of metals in tetrahydrofuran

et al. 2011

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The influence of fundamental and second harmonic wavelength on ablation efficiency and nanoparticle properties is studied during picosecond laser ablation of silver, zinc, and magnesium in polymer-doped tetrahydrofuran. Laser ablation in stationary liquid involves simultaneously the fabrication of nanoparticles by ablation of the target material and fragmentation of dispersed nanoparticles by post irradiation. The ratio in which the laser pulse energy contributes to these processes depends on laser wavelength and colloidal properties. For plasmon absorbers (silver), using the second harmonic wavelength leads to a decrease of the nanoparticle productivity over process time along with exponential decrease in particle diameter, while using the fundamental wavelength results in a constant ablation rate and linear decrease in particle diameter. For colloids made of materials without plasmon absorption (zinc, magnesium), laser scattering is the colloidal property that limits nanoparticle productivity by Mie-scattering of dispersed nanoparticle clusters.A. Schwenke · P. Wagener · S. Barcikowski ( ) Laser Zentrum Hannover e.V.,

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Comments on explosive mechanisms of laser sputtering

Cited by 295 publications

References 27 publications

Molecular-dynamics study of ablation of solids under femtosecond laser pulses

Molecular-dynamics study of ablation of solids under femtosecond laser pulses

Computer Simulations of Laser Ablation of Molecular Substrates

Influence of processing time on nanoparticle generation during picosecond-pulsed fundamental and second harmonic laser ablation of metals in tetrahydrofuran

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