Self-organized nanopatterns in thin layers of superheated liquid metals

Gurevich, Evgeny L.

doi:10.1103/physreve.83.031604

Cited by 37 publications

(24 citation statements)

References 20 publications

(27 reference statements)

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“…These remnants form the random relief in Figure 1D. This solid relief is observed in experiments in vacuum [23][24][25][26][27][28] and in the case of ablation in liquid, see Figure 8 in [7].…”

Section: Decay Of Metal Into Vacuum or Liquidmentioning

confidence: 55%

Laser ablation of metal into liquid: Near critical point phenomena and hydrodynamic instability

Inogamov

Zhakhovsky

Хохлов

2018

AIP Conference Proceedings

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Laser ablation of gold irradiated through the transparent water is studied. We follow dynamics of gold expansion into the water along very long (up to 200 ns) time interval. This is significant because namely at these late times pressure at a contact boundary between gold (Au) and water decreases down to the saturation pressure of gold. Thus the saturation pressure begins to influence dynamics near the contact. The inertia of displaced water decelerates the contact. In the reference frame connected with the contact, the deceleration is equivalent to the free fall acceleration in a gravity field. Such conditions are favorable for the development of Rayleigh-Taylor instability (RTI) because heavy fluid (gold) is placed above the light one (water) in a gravity field. We extract the increment of RTI from 2T-HD 1D runs. Surface tension and especially viscosity significantly dump the RTI gain during deceleration. Atomistic simulation with Molecular Dynamics method combined with Monte-Carlo method (MD-MC) for large electron heat conduction in gold is performed to gain a clear insight into the underlying mechanisms. MD-MC runs show that significant amplification of surface perturbations takes place. These perturbations start just from thermal fluctuations and the noise produced by bombardment of the atmosphere by fragments of foam. The perturbations achieve amplification enough to separate the droplets from the RTI jets of gold. Thus the gold droplets fall into the water. arXiv:1803.07343v1 [physics.comp-ph]

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Section: Decay Of Metal Into Vacuum or Liquidmentioning

confidence: 55%

Laser ablation of metal into liquid: Near critical point phenomena and hydrodynamic instability

Inogamov

Zhakhovsky

Хохлов

2018

AIP Conference Proceedings

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“…Similarity between the patterns generated upon the laser ablation (cells [3,42], LIPSS) and the convection patterns [43] suggests that convection may be the physical reason of the LIPSS generation. Moreover, the patterns in these both systems are induced by heating of a thin liquid layer.…”

Section: Hydrodynamic Instabilitiesmentioning

confidence: 81%

“…That is, the excitation of the surface plasmons by reducing the phase velocity of light is not realized by laser ablation, since it requires an exact fitting the incident angle of the light to the optical constants of the material. The LIPSS appear at similar laser ablation parameters in metals, semiconductors, dielectrics and polymers [1,2,3,4,5,6,28], i.e., in conductive and in dielectric materials, which have a broad range of dielectric constants. This fact suggests that other ways of the plasmon excitation, independent on the material properties, must be looked for.…”

Section: Excitation Via Slow Lightmentioning

confidence: 98%

Laser Induced Periodic Surface Structures induced by surface plasmons coupled via roughness

Gurevich

2014

Applied Surface Science

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In this paper the formation mechanisms of the femtosecond laser-induced periodic surface structures (LIPSS) are discussed. One of the most frequentlyused theories explains the structures by interference between the incident laser beam and surface plasmon-polariton waves. The latter is most commonly attributed to the coupling of the incident laser light to the surface roughness. We demonstrate that this excitation mechanism of surface plasmons contradicts to the results of laser-ablation experiments. As an alternative approach to the excitation of LIPSS we analyse development of hydrodynamic instabilities in the melt layer.

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“…In this context, recent theoretical studies have shown that surface gradients of temperature may be sufficient to enable the development of surface hydrodynamic instabilities on metals and semiconductors [49,50], whereas non-dimensional number analysis has been proposed for laser-irradiated metals [51]. Although recent time-resolved imaging of laser-irradiated semiconductors could not strictly lead to the emergence of grating-like LIPSS after a single pulse [27], such a possibility was observed in specific laser-irradiated metals where LIPSS were seemingly originating from hydrodynamic effects [52]. To shed light on the laser-induced hydrodynamic phenomena under our experimental conditions, in the present study, a similar approach was applied to investigate the possible regimes of molten layer transport in the case of hot fused silica.…”

Section: Resultsmentioning

confidence: 99%

Femtosecond Laser-Induced Periodic Surface Structures on Fused Silica: The Impact of the Initial Substrate Temperature

et al. 2018

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The formation and properties of laser-induced periodic surface structures (LIPSS) were investigated upon fs-laser irradiation of fused silica at different initial substrate temperatures, TS. For substrate heating between room temperature, TRT, and TS = 1200 °C, a continuous wave CO2 laser was used as the radiation source. The surface structures generated in the air environment at normal incidence with five successive fs-laser pulses (pulse duration, τ = 300 fs, laser wavelength, λ = 1025 nm, repetition frequency, frep = 1 kHz) were characterized by using optical microscopy, scanning electron microscopy, and 2D-Fourier transform analysis. The threshold fluence of fused silica was systematically investigated as a function of TS. It was shown that the threshold fluence for the formation of low-spatial frequency LIPSS (LSFL) decreases with increasing TS. The results reveal that the initial spatial period observed at TRT is notably increased by increasing TS, finally leading to the formation of supra-wavelength LIPSS. The findings are discussed in the framework of the electromagnetic interference theory, supplemented with an analysis based on thermo-convective instability occurring in the laser-induced molten layer. Our findings provide qualitative insights into the formation mechanisms of LIPSS, which allow improvements of the control of nanostructure formation to be made for corresponding applications of dielectric materials in the future.

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Self-organized nanopatterns in thin layers of superheated liquid metals

Cited by 37 publications

References 20 publications

Laser ablation of metal into liquid: Near critical point phenomena and hydrodynamic instability

Laser ablation of metal into liquid: Near critical point phenomena and hydrodynamic instability

Laser Induced Periodic Surface Structures induced by surface plasmons coupled via roughness

Femtosecond Laser-Induced Periodic Surface Structures on Fused Silica: The Impact of the Initial Substrate Temperature

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