Surface nano-structuring produced by spallation of metal irradiated by an ultrashort laser pulse

Inogamov, N. A.; Zhakhovsky, V. V.; Ашитков, С. И.; Emirov, Yusuf; Faenov, A. Ya.; Pikuz, T. A.; Ishino, Masahiko; Kando, M.; Hasegawa, Nobory; Nishikino, Masaharu; Kawachi, Tetsuya; Агранат, М. Б.; Andriash, Alexander V; Kuratov, S E; Oleynik, Ivan

doi:10.1088/1742-6596/500/11/112070

Cited by 12 publications

(11 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This interpretation is supported by the brownish color of the surface that can be realized upon inspection. Somewhat similar results have been reported in [ 41 – 43 ], showing a laser-induced decrease of material density via the creation of cavities, obtaining a foam-like structure. This phenomenon is not observed for laser rescanning, reaching ablation depths as high as 700 µm for the highest fluence and highest number of rescans.…”

Section: Resultssupporting

confidence: 88%

Biomimetic surface structures in steel fabricated with femtosecond laser pulses: influence of laser rescanning on morphology and wettability

Baron¹,

Mimidis²,

Puerto³

et al. 2018

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

The replication of complex structures found in nature represents an enormous challenge even for advanced fabrication techniques, such as laser processing. For certain applications, not only the surface topography needs to be mimicked, but often also a specific function of the structure. An alternative approach to laser direct writing of complex structures is the generation of laser-induced periodic surface structures (LIPSS), which is based on directed self-organization of the material and allows fabrication of specific micro- and nanostructures over extended areas. In this work, we exploit this approach to fabricate complex biomimetic structures on the surface of steel 1.7131 formed upon irradiation with high repetition rate femtosecond laser pulses. In particular, the fabricated structures show similarities to the skin of certain reptiles and integument of insects. Different irradiation parameters are investigated to produce the desired structures, including laser repetition rate and laser fluence, paying special attention to the influence of the number of times the same area is rescanned with the laser. The latter parameter is identified to be crucial for controlling the morphology and size of specific structures. As an example for the functionality of the structures, we have chosen the surface wettability and studied its dependence on the laser processing parameters. Contact angle measurements of water drops placed on the surface reveal that a wide range of angles can be accessed by selecting the appropriate irradiation parameters, highlighting also here the prominent role of the number of scans.

show abstract

Section: Resultssupporting

confidence: 88%

Biomimetic surface structures in steel fabricated with femtosecond laser pulses: influence of laser rescanning on morphology and wettability

Baron¹,

Mimidis²,

Puerto³

et al. 2018

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

show abstract

“…Typical maximum velocity of recrystallization of a metal is ∼ 100 m/s. Rate of diffusion of atoms in a liquid phase limits velocity of recrystallization v recr [43,39,40]. Our hydrodynamic simulations gives larger values for this quantity corresponding to formal application of a Fourier's law for thermal conductivity connecting ∇T and v recr [38,42].…”

Section: Separation Of Acoustic Zones and Hot Advection Layermentioning

confidence: 80%

“…The steps are approximately homogeneous temperature distributions inside the liquid layers, while the intervals between the steps are the rather steep rises of temperature in a vapor layer between two neighboring liquid layers. In real 3D geometry the foamy zone contains a mixture of membranes, droplets, and vapor [1,39,40,41]. Vapor surrounding the droplets is weakly conductive.…”

Section: Separation Of Acoustic Zones and Hot Advection Layermentioning

confidence: 99%

Laser-induced ablation of metal in liquid

Petrov,

Khokhlov,

Zhakhovsky

et al. 2018

Preprint

View full text Add to dashboard Cite

Laser ablation in liquid (LAL) is important perspective way to compose nanoparticles (NP) necessary for modern technologies. LAL is not fully understood. Deep understanding is necessary to optimize processes and decrease high price of the LAL NPs. Today there are two groups of studies: in one of them scientists go from analyzing of bubble dynamics (thus they proceed from the late stages), while in another one scientists investigate early stages of ablation. In the present paper we consider the process as whole: from ablation and up to formation of a bubble and its inflation. Thus we cover extremely wide range of spatiotemporal scales. We consider role of absorbed energy and duration of pulse (femtosecond, multi-picosecond, nanosecond). Importance of supercritical states is emphasized. Diffusive atomic and hydrodynamic mixing due to Rayleigh-Taylor instability and their mutual interdependence are described.Liquid near contact with metal is heated by dissipation in strong shock and due to small but finite heat conduction in liquid; metal absorbing laser energy is hot and thus it serves as a heater for liquid. Spatial expansion and cooling of atomically mixed liquid and metal causes condensation of metal into NPs when pressure drops below critical pressure for metal. Development of bubble takes place during the next stages of decrease of pressure below critical parameters for liquid and below ambient pressure in liquid. Thin hot layer of liquid near contact expands in volume to many orders of magnitude filling the inflating bubble.

show abstract

“…The mechanics of formation of the droplet at the end of a liquid jet or a thickened rim around the hole in a liquid membrane has been considered in [ 22 ] in the case of a bump and in [ 28 ] in the case of membranes in a foam; see also Figs. 8 and 9 below.…”

Section: Resultsmentioning

confidence: 99%

Solitary Nanostructures Produced by Ultrashort Laser Pulse

Inogamov

Zhakhovsky²,

Хохлов

et al. 2016

Nanoscale Res Lett

View full text Add to dashboard Cite

Laser-produced surface nanostructures show considerable promise for many applications while fundamental questions concerning the corresponding mechanisms of structuring are still debated. Here, we present a simple physical model describing those mechanisms happened in a thin metal film on dielectric substrate irradiated by a tightly focused ultrashort laser pulse. The main ingredients included into the model are (i) the film–substrate hydrodynamic interaction, melting and separation of the film from substrate with velocity increasing with increase of absorbed fluence; (ii) the capillary forces decelerating expansion of the expanding flying film; and (iii) rapid freezing into a solid state if the rate of solidification is comparable or larger than hydrodynamic velocities. The developed model and performed simulations explain appearance of microbump inside the focal spot on the film surface. The model follows experimental findings about gradual transformation of the bump from small parabolic to a conical shape and to the bump with a jet on its tip with increasing fluence. Disruption of the bump as a result of thinning down the liquid film to a few interatomic distances or due to mechanical break-off of solid film is described together with the jetting and formation of one or many droplets. Developed theory opens door for optimizing laser parameters for intended nanostructuring in applications.

show abstract

Surface nano-structuring produced by spallation of metal irradiated by an ultrashort laser pulse

Cited by 12 publications

References 4 publications

Biomimetic surface structures in steel fabricated with femtosecond laser pulses: influence of laser rescanning on morphology and wettability

Biomimetic surface structures in steel fabricated with femtosecond laser pulses: influence of laser rescanning on morphology and wettability

Laser-induced ablation of metal in liquid

Solitary Nanostructures Produced by Ultrashort Laser Pulse

Contact Info

Product

Resources

About