Nanoscale cavitation instability of the surface melt along the grooves of one-dimensional nanorelief gratings on an aluminum surface

Ионин, А. А.; Kudryashov, S. I.; Ligachev, A. E.; Makarov, Sergey; Селезнев, Л. В.; Sinitsyn, D. V.

doi:10.1134/s0021364011160065

Cited by 48 publications

(37 citation statements)

References 19 publications

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“…When the fluence is in the range of 0.5-0.9 J/cm 2 , approximately corresponding to the spallation threshold ablation F spall ≈ 0.7 J/cm 2 for a smooth aluminum surface [21,22], a nanofoam in the ripple relief minima is formed (Fig. 1a), which is in good agreement with the previous predictions of the molecular dynamics modeling [23].…”

Section: Resultssupporting

confidence: 90%

“…Quasi ordered nanoripples with periods of about 0.25λ and transverse orientation relative to the above mentioned ripples emerge at F ≤ 0.2 J/cm 2 . They have been observed previously and are associated with the development of cavitation instability [20].…”

Section: Methodssupporting

confidence: 90%

“…2c). This means that, at fluences less than 0.5 J/cm 2 , one cannot exceed the spallation threshold (F spall ≈ 0.7 J/cm 2 [21]) in the interference maxima near the nanotrench. However, at fluence of 0.9 J/cm 2 (Fig.…”

Section: Modeling Of the Electric Field Distributionmentioning

confidence: 97%

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Nonlinear evolution of aluminum surface relief under multiple femtosecond laser irradiation

et al. 2015

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The electromagnetic field interference distribution on the aluminum surface during formation of laser induced periodic surface structures (ripples) under femtosecond laser irradiation is studied. The nonlinear dependence of optical feedback on the geometric parameters of the ripples is shown to play a key role in non linear evolution of the relief with increasing number of pulses. The strongest optical feedback is observed for periods of ripples in the range of Λ = 0.65λ-0.75λ at relief modulation of h = 0.15λ-0.2λ, where λ is the laser wavelength. On the basis of the developed approach, we explain why the frequently observed femtosecond laser induced ripples have similar periods on materials with a high value of the imaginary part and strongly negative real part of permittivity.

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Section: Resultssupporting

confidence: 90%

Section: Methodssupporting

confidence: 90%

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Nonlinear evolution of aluminum surface relief under multiple femtosecond laser irradiation

et al. 2015

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“…The effect of swelling is not unique to Ag and has also been observed for femtosecond laser irradiation of Al targets [3,62,63], where the presence of sub-surface voids was directly confirmed in transmission electron microscopy (TEM) and scanning electron microscopy (SEM)…”

Section: Experimental Observation Of Surface Swellingmentioning

confidence: 84%

Generation of subsurface voids and a nanocrystalline surface layer in femtosecond laser irradiation of a single-crystal Ag target

et al. 2015

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Structural transformations in a shallow surface region of a bulk Ag (001) target irradiated by a femtosecond laser pulse are investigated in large-scale atomistic simulations and experiments.The simulations reveal a complex interplay of fast laser melting, rapid resolidification, and the dynamic relaxation of laser-induced stresses that leads to the formation of a sub-surface porous region covered by a nanocrystalline surface layer. The generation of the porous region is consistent with the experimental observation of surface "swelling" occurring at laser fluences below the spallation/ablation threshold and may be related to the incubation effect in multi-pulse laser ablation of metals. The nanocrystalline layer is produced by massive nucleation of crystallites triggered by a deep undercooling of the melted surface region experiencing fast quenching at a rate on the order of 10 11 K/s. The predicted surface structure features random crystallographic orientation of nanograins and a high density of stacking faults, twins, and nanoscale twinned structural elements with five-fold symmetry, which suggests high hardness and possible enhancement of catalytic activity of the surface.

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“…1). As a result, it is the fragmentation ablation mechanism that was applied in study to fabricate multimodal (nano-and micro-scale) surface relief texture at an optimum pulse duration of 0.3 ps, enabling highly efficient ablative fabrication of microtrenches covered with nanoscaled products of subsurface cavitation [14,15] and laser ablation (Fig. 2).…”

Section: Methodsmentioning

confidence: 99%

Fabrication of Superhydrophobic Coating on Stainless Steel Surface by Femtosecond Laser Texturing and Chemisorption of an Hydrophobic Agent

et al. 2015

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Nanoscale cavitation instability of the surface melt along the grooves of one-dimensional nanorelief gratings on an aluminum surface

Cited by 48 publications

References 19 publications

Nonlinear evolution of aluminum surface relief under multiple femtosecond laser irradiation

Nonlinear evolution of aluminum surface relief under multiple femtosecond laser irradiation

Generation of subsurface voids and a nanocrystalline surface layer in femtosecond laser irradiation of a single-crystal Ag target

Fabrication of Superhydrophobic Coating on Stainless Steel Surface by Femtosecond Laser Texturing and Chemisorption of an Hydrophobic Agent

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