Mechanisms of melt droplets and solid-particle ejection from a target surface by pulsed laser action

Brailovsky, A. B.; Gaponov, S. V.; Luchin, V. I.

doi:10.1007/s003390050169

Cited by 14 publications

(12 citation statements)

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“…15 The nonuniform surface vaporization in turn could induce local pressure gradients in the laser generated plasma developing in front of the irradiated target, the pressure being higher in the valleys than on the ripples top. 16 These pressure gradients could induce liquid motion from the valleys toward the columns top. The application of a target bias voltage generates an electric field, which exerts an extra driving force upon the species present in the laser produced ablation plasma.…”

Section: Discussionmentioning

confidence: 99%

Laser-Induced Growth of Titanium Nitride Microcolumns on Biased Titanium Targets

et al. 2005

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Titanium targets with a bias voltage ranging from −500 to +500 V were submitted to multipulse high repetition rate Nd:yttrium aluminum garnet (YAG; ‫ס‬ 1.064 m, ∼ 300 ns, ‫ס‬ 30 kHz) laser irradiations in nitrogen at intensity values below the single-pulse melting threshold. The morphology of the TiN structures formed under the cumulative action of the laser pulses on the surface of the unbiased and biased targets was investigated by profilometry and scanning electron microscopy. Under these irradiation conditions, a specific columnar surface microrelief developed. The height of the microcolumns reached about 10-15 m, and their diameter about 1-2 m. The development of TiN microcolumns was enhanced by the applied bias voltage. The enhancement in the negative biased samples was stronger than that in the positive biased ones.

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Section: Discussionmentioning

confidence: 99%

Laser-Induced Growth of Titanium Nitride Microcolumns on Biased Titanium Targets

et al. 2005

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“…In general, condensation droplets are typically formed in long-pulse (ms) and low-intensity (10 4 -10 5 W/cm 2 ) regimes [3]; however, they can also be generated at higher laser intensity and shorter pulse (e.g. 10 8 -10 10 W/cm 2 and a few ns pulse) under the slow expansion of the vapor plume into the background gas [7].…”

Section: Introductionmentioning

confidence: 99%

Multi-scale modeling of phase explosion in high fluence nanosecond laser ablation and clarification of ablation depth prediction criterion

Cao

Shin

2015

Applied Surface Science

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a b s t r a c tWhen phase explosion occurs, accurate prediction of the ablation behavior in the high energy nanosecond laser ablation process still remains a difficult challenge. In this paper, nanosecond laser ablation of aluminum and copper with phase explosion is investigated through a multi-scale model and experimental verification. The melt ejection behavior during phase explosion is successfully predicted by combined molecular dynamics (MD) and smoothed particle hydrodynamics (SPH) simulations and validated against the experiments. The commonly adopted 0.9T c (critical temperature) criterion for phase explosion boundary is also assessed with the prediction of the ablation depth for both aluminum and copper, and it is found that the 0.9T c criterion does not always work. The multi-scale model developed in this work is shown to have better capability in predicting the ablation behavior when phase explosion is involved.

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“…Also, the vaporization-induced recoil pressure [36] directs the melted silicon to the dark core. After the vortex pulse is gone (the recoil pressure is also gone), the melted silicon further transports toward the dark core by thermal diffusion effects.…”

Section: Silicon Microneedle [30]mentioning

confidence: 99%

“…An Vortex Dynamics and Optical Vorticesadditional 200-600 ns later, the silicon is supercooled to recrystallize at the core (Figure 8a). A capillary wave [36] induced by the optical vortex illumination also ejects superfluous silicon droplets with a radius a given by the following formula,…”

Section: Silicon Microneedle [30]mentioning

confidence: 99%

Optical Vortices Illumination Enables the Creation of Chiral Nanostructures

Omatsu¹,

Miyamoto²,

Morita³

2017

Vortex Dynamics and Optical Vortices

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We discovered that optical vortices with an annular spatial form and an orbital angular momentum owing to a helical wave front enable us to twist materials, such as metal, silicon and azo-polymer, to form various structured matters including microneedles, chiral nanostructures and chiral surface reliefs. Such structured matters will potentially open the door to advanced devices, for instance, silicon photonic device, biomedical microelectro-mechanical systems, ultrasensitive detector for chiral chemical composites and plasmonic metasurfaces for chiral chemical reactions.

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Mechanisms of melt droplets and solid-particle ejection from a target surface by pulsed laser action

Cited by 14 publications

References 0 publications

Laser-Induced Growth of Titanium Nitride Microcolumns on Biased Titanium Targets

Laser-Induced Growth of Titanium Nitride Microcolumns on Biased Titanium Targets

Multi-scale modeling of phase explosion in high fluence nanosecond laser ablation and clarification of ablation depth prediction criterion

Optical Vortices Illumination Enables the Creation of Chiral Nanostructures

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