Journal ArticleDOI
Ultrashort pulse laser ablation of silicon: an MD simulation study
TLDR
In this article, the impact of laser pulses with lengths ranging from 5 ps down to 10 fs on a target of approximately 100A x 100A × 50A was investigated, and the ablation shows a strong dependence on pulse length, on pulse energy and on the number of laser shots.Abstract:
Molecular Dynamics (MD) simulation has been employed in order to study laser ablation of silicon surfaces. The impact of laser pulses with lengths ranging from 5 ps down to 10 fs on a target of approximately 100A x 100A x 50A was investigated. The ablation shows a strong dependence on pulse length, on pulse energy and on the number of laser shots. With decreasing pulse length the amount of removed particles increases, and with decreasing pulse energy the holes become narrower. Especially in multishot ablations, holes with a diameter of just a fraction of the focus could be observed. This can be attributed mainly to ablation of atoms from lower areas and their redeposition close to the surface, leading to amorphous areas around the ablation hole. For pulses of picosecond duration, and even for femtosecond pulses, the main material removal occurs on a timescale of a few ps. Interestingly, the simulations show two thresholds: the onset of damage at the surface. which depends on the pulse energy but only insignificantly on the pulse length; and the onset of the removal of particles, which shows a strong dependence on the pulse length of the laser.read more
Citations
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Journal ArticleDOI
Combined atomistic-continuum modeling of short-pulse laser melting and disintegration of metal films
TL;DR: In this paper, the kinetics and microscopic mechanisms of laser melting and disintegration of thin Ni and Au films irradiated by a short, from 200 fs to 150 ps, laser pulse are investigated in a coupled atomistic-continuum computational model.
Journal ArticleDOI
Modelling ultrafast laser ablation
TL;DR: In this paper, a review is devoted to the study of ultrafast laser ablation of solids and liquids, including light absorption by electrons in the skin layer, energy transfer from the skin to target interior by nonlinear electronic heat conduction, relaxation of the electron and ion temperatures, ultrafast melting, hydrodynamic expansion of heated matter accompanied by the formation of metastable states and subsequent formation of breaks in condensed matter.
Journal ArticleDOI
Dynamics of ripple formation on silicon surfaces by ultrashort laser pulses in subablation conditions
George D. Tsibidis,M. Barberoglou,Panagiotis A. Loukakos,Emmanuel Stratakis,Emmanuel Stratakis,Costas Fotakis,Costas Fotakis +6 more
TL;DR: In this article, a unified model is presented to account for crater and subwavelength ripple formation based on a synergy of electron excitation and capillary wave solidification, and details of the surface morphology attained are elaborated as a function of the imposed conditions, and results are tested against experimental data.
Journal ArticleDOI
Microscopic mechanisms of laser spallation and ablation of metal targets from large-scale molecular dynamics simulations
Chengping Wu,Leonid V. Zhigilei +1 more
TL;DR: In this article, the microscopic mechanisms of femtosecond laser ablation of an Al target are investigated in large-scale massively parallel atomistic simulations performed with a computational model combining classical molecular dynamics technique with a continuum description of the laser excitation and subsequent relaxation of conduction band electrons.
Journal ArticleDOI
Interaction of slow, very highly charged ions with surfaces
TL;DR: In this paper, a review of recent advances in the studies of the interaction of slow (v < vBohr), very highly charged ions with surfaces of metals, semiconductors, and insulators (including biological materials) is presented.
References
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Book ChapterDOI
Computer-Simulation Methods
TL;DR: The Ising model is introduced in order to provide a concrete illustration of the Monte Carlo method, which will be useful also in later chapters as a simple context in which to present some of the algorithms the authors will discuss.