Mechanisms of small clusters production by short and ultra-short laser ablation

Itina, Tatiana E.; Gouriet, Karine; Zhigilei, Leonid V.; Noël, Sylvie; Hermann, J.; Sentís, M.

doi:10.1016/j.apsusc.2007.02.034

Cited by 85 publications

(64 citation statements)

References 28 publications

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“…For investigation of the long-term expansion of the ablation plume, in particular, a combination of MD with the DSMC method [195] has been demonstrated to be a promising approach capable of following the evolution of the parameters of the ablation plume on the scales, characteristic for experimental conditions, up to hundreds of microseconds and millimeters [50][51][52][53][54][55]. In the combined MD-DSMC model [78,185,187,[196][197][198][199], MD is used for simulation of the initial stage of the ablation process (first nanoseconds) and provides the initial conditions for DSMC simulation of the processes occurring during the long-term expansion of the ejected plume. First applications of the combined MD-DSMC model for simulation of laser interactions with molecular systems have demonstrated the ability of the model to reveal interrelations between the processes occurring at different time-and length-scales and responsible for the evolution of the characteristics of the ablation plume [187,[197][198][199].…”

Section: Discussionmentioning

confidence: 99%

“…In the combined MD-DSMC model [78,185,187,[196][197][198][199], MD is used for simulation of the initial stage of the ablation process (first nanoseconds) and provides the initial conditions for DSMC simulation of the processes occurring during the long-term expansion of the ejected plume. First applications of the combined MD-DSMC model for simulation of laser interactions with molecular systems have demonstrated the ability of the model to reveal interrelations between the processes occurring at different time-and length-scales and responsible for the evolution of the characteristics of the ablation plume [187,[197][198][199]. In particular, the initial generation of clusters in the phase explosion, predicted in MD simulations, is found to provide cluster precursors for condensation during the long-term plume expansion, thus eliminating the three-body collision bottleneck in the cluster growth process (see Chap.…”

Section: Discussionmentioning

confidence: 99%

“…In particular, a detailed analysis of the dynamics of the plume formation in simulations performed for molecular targets with both long (no stress confinement) [110] and short (stress confinement) [185] laser pulses and fluences about twice the threshold for the ablation onset, reveals that only small clusters and monomers are ejected at the front of the expanding plume, medium-sized clusters are localized in the middle of the expanding plume, whereas the larger liquid droplets formed later during the plume development tend to be slower and are closer to the original surface. The cluster segregation effect, predicted in the simulations, can be related to the recent results of plume imaging experiments [186][187][188][189][190], where splitting of the plume into a fast component with optical emission characteristic for neutral atoms and a slow component with blackbody-like emission attributed to the presence of hot clusters [191], is observed. Similarly, and consistently with the results of the simulations discussed in [110,185], a layered structure of the plume (vaporized layer followed by small particles and larger droplets) observed in nanosecond laser ablation of water and soft tissue [192], is attributed to the succession of phase transitions occurring at different depths in the irradiated target [192,193].…”

Section: Phase Explosion and Laser Ablationmentioning

confidence: 99%

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Atomic/Molecular-Level Simulations of Laser–Materials Interactions

Zhigilei

Lin

Ivanov

et al. 2009

Laser-Surface Interactions for New Materials Production

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Summary. Molecular/atomic-level computer modeling of laser-materials interactions is playing an increasingly important role in the investigation of complex and highly nonequilibrium processes involved in short-pulse laser processing and surface modification. This chapter provides an overview of recent progress in the development of computational methods for simulation of laser interactions with organic materials and metals. The capabilities, advantages, and limitations of the molecular dynamics simulation technique are discussed and illustrated by representative examples. The results obtained in the investigations of the laser-induced generation and accumulation of crystal defects, mechanisms of laser melting, photomechanical effects and spallation, as well as phase explosion and massive material removal from the target (ablation) are outlined and related to the irradiation conditions and properties of the target material. The implications of the computational predictions for practical applications, as well as for the theoretical description of the laser-induced processes are discussed. IntroductionShort-pulse lasers are used in a diverse range of applications, from advanced materials processing, cutting, drilling, and surface micro-and nanostructuring [1,2] to pulsed-laser deposition of thin films and coatings [3], laser surgery [4,5], and artwork restoration [6,7], and to the exploration of the conditions for inertial confinement fusion, with the world's most energetic laser system being built at the National Ignition Facility at Lawrence Livermore National Laboratory [8]. At the fundamental science level, short-pulse laser irradiation has the ability to bring material into a highly nonequilibrium state and provides a unique opportunity to probe the material behavior under extreme conditions. In particular, optical pump-probe experiments have been used to investigate transient changes in the electronic structure of the irradiated surface with high (often subpicosecond) temporal resolution [9][10][11][12][13], whereas recent advances in time-resolved X-ray and electron diffraction

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Phase Explosion and Laser Ablationmentioning

confidence: 99%

See 1 more Smart Citation

Atomic/Molecular-Level Simulations of Laser–Materials Interactions

Zhigilei

Lin

Ivanov

et al. 2009

Laser-Surface Interactions for New Materials Production

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“…A descriptive structure is created by the software to handle the cells and their relationships between neighbouring cells. This is shown in expression (15). This structure is a special two-dimensional matrix.…”

Section: Definition Of Cells and Thermal Connections Between Cellsmentioning

confidence: 99%

“…Aim of our models is to clarify the role of different physical phenomena in the laser-material interaction. These models also study, among others, details of the photothermal and photo-chemical effects [8], [9], [10] [11]; plume; plasma formation and their shielding influence [12], [13], [14], [15]; appearing mechanical stresses and acoustic waves due to the explosion-like processes during the laser shot [16]; or, coupled phenomenon like the Marangoni-convection [17]. Since these models are near to the laser-material interface, they are very complex and do not deal with the influence of the overall structure of the sample, e.g.…”

Section: Basic Theory For Modelling Of Laser Ablationmentioning

confidence: 99%

Computer modelling of the laser ablation of polymers

Sinkovics

Gordon

Harsányi

2010

Applied Thermal Engineering

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Laser ablation of polymers has been the subject of extensive studies for nearly three decades. Results of these investigations have shown that thermal effects play an important role during frequency tripled nanosecond Nd:YAG laser ablation of polyimide. Despite of the studies, effect of these processes has not been satisfactorily clarified. Thermal effects, photochemical and other phenomena still exist and so the thermal modelling of laser ablation is a very specialised problem. The investigation in this paper deals with special conditions in thermal models, which highly differ from more common conditions. Although there are numerous excellent thermal modelling software available, mainly in the field of electronics technology, these are not suitable or ready for handling special conditions, for example the removing of material from the domain under investigation, which is one of the most important areas. Hence we decided to develop a special thermal modelling tool. The model designing aspects which define the development process are presented in this paper.

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Photo‐stability and Photo‐damage of SPASER Nanoparticles under Nanosecond Pulsed‐laser

Wang

Melentiev

et al. 2021

Chin. J. Chem.

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SPASER nanoparticle (NP), with small size, ultranarrow spectral-line and good biocompatibility, is a potential biomedical nanoprobe. However, owning to the striking light absorption capacity of Au-resonator, huge energy could accumulate under strong pumping-laser, which would lead to poor photo-stability and unexpected photo-damage to SPASER NP, and is harmful to its future practical application but hasn't been systematically studied in experiment. In this paper, our experimental and theoretical researches revealed that the photo-stability of SPASER NP is largely determined by its structure parameters: smaller Au-core diameter, thicker silica-shell will contribute to better photo-stability. And the possibility and extent of photo-damage of SPASER NP depend on not only its intrinsic stability but also the external pumping-laser. Notably, the strong pumping condition for two-level SPASER system could lead to heating-melting-evaporation or even phase-explosion of SPASER NP, resulting in obvious photo-damage, while, the weak pumping condition for three-level SPASER system is quite friendly. This study provides reliable bases for the structural-properties optimization of SPASER NPs, which is of great significance for its future application as a novel luminescence probe.

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Mechanisms of small clusters production by short and ultra-short laser ablation

Cited by 85 publications

References 28 publications

Atomic/Molecular-Level Simulations of Laser–Materials Interactions

Atomic/Molecular-Level Simulations of Laser–Materials Interactions

Computer modelling of the laser ablation of polymers

Photo‐stability and Photo‐damage of SPASER Nanoparticles under Nanosecond Pulsed‐laser

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