Ablation and nanostructuring of metals by femtosecond laser pulses

Ашитков, С. И.; Komarov, P. S.; Овчинников, А. В.; Struleva, E. V.; Жаховский, В. В.; Inogamov, N. A.; Агранат, М. Б.

doi:10.1070/qe2014v044n06abeh015448

Cited by 40 publications

(8 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latter is most probably the consequence of a laser-induced nucleation or spallation process at fluences around the melting threshold, process that exhibits a statistical dependence of an Arhenius-like activation energy. A first laser pulse interacting with an initially flat surface close to ablation threshold nucleates solid-liquid transitions 17 , 33 at specific “weak” sites, triggering subsurface voids formation, swelling or hydrodynamic instabilities 34 . This randomly modifies the topography of the surface seen by a second pulse, for which the light coupling will be more complex.…”

Section: Resultsmentioning

confidence: 99%

“…The ultimate size of the modification is then defined mainly by the material response to energy absorption and transport, with scales significantly smaller than those related to light confinement. This response can be of thermomechanical, hydrodynamic, or ablative nature 1 , 17 , 18 . One of the most spectacular laser nanostructuring processes is the formation of sub-wavelength ripples on materials ranging from metals to dielectrics.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In-situ high-resolution visualization of laser-induced periodic nanostructures driven by optical feedback

Aguilar

Mauclair

Faure

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Optical feedback is often evoked in laser-induced periodic nanostructures. Visualizing the coupling between surfaces and light requires highly-resolved imaging methods. We propose in-situ structured-illumination-microscopy to observe ultrafast-laser-induced nanostructures during fabrication on metallic glass surfaces. This resolves the pulse-to-pulse development of periodic structures on a single irradiation site and indicates the optical feedback on surface topographies. Firstly, the quasi-constancy of the ripples pattern and the reinforcement of the surface relief with the same spatial positioning indicates a phase-locking mechanism that stabilizes and amplifies the ordered corrugation. Secondly, on sites with uncorrelated initial corrugation, we observe ripple patterns spatially in-phase. These feedback aspects rely on the electromagnetic interplay between the laser pulse and the surface relief, stabilizing the pattern in period and position. They are critically dependent on the space-time coherence of the exciting pulse. This suggests a modulation of energy according to the topography of the surface with a pattern phase imposed by the driving pulse. A scattering and interference model for ripple formation on surfaces supports the experimental observations. This relies on self-phase-stabilized far-field interaction between surface scattered wavelets and the incoming pulse front.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In-situ high-resolution visualization of laser-induced periodic nanostructures driven by optical feedback

Aguilar

Mauclair

Faure

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Thermocapillary and Marangoni effects as well as Rayleigh–Plateau instability have been identified to influence the structure formation and its disintegration process [ 23 , 24 ]. Later on, however, the relaxation of the laser-induced stresses, generated in the vicinity of the target’s surface as a result of the laser heating, has been determined as a main driving mechanism responsible for the nanostructures growth [ 25 , 26 , 27 ]. The specifics of the final nanostructures shape depend on the material as well as on the laser parameters, the dynamical changes of the reflectivity of the material [ 28 , 29 ], and the geometric parameters of the irradiation pattern.…”

Section: Introductionmentioning

confidence: 99%

Formation of Periodic Nanoridge Patterns by Ultrashort Single Pulse UV Laser Irradiation of Gold

et al. 2020

View full text Add to dashboard Cite

A direct comparison of simulation and experimental results of UV laser-induced surface nanostructuring of gold is presented. Theoretical simulations and experiments are performed on an identical spatial scale. The experimental results have been obtained by using a laser wavelength of 248 nm and a pulse length of 1.6 ps. A mask projection setup is applied to generate a spatially periodic intensity profile on a gold surface with a sinusoidal shape and periods of 270 nm, 350 nm, and 500 nm. The formation of structures at the surface upon single pulse irradiation is analyzed by scanning and transmission electron microscopy (SEM and TEM). For the simulations, a hybrid atomistic-continuum model capable of capturing the essential mechanisms responsible for the nanostructuring process is used to model the interaction of the laser pulse with the gold target and the subsequent time evolution of the system. The formation of narrow ridges composed of two colliding side walls is found in the simulation as well as in the experiment and the structures generated as a result of the material processing are categorized depending on the range of applied fluencies and periodicities.

show abstract

“…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

Ablation and nanostructuring of metals by femtosecond laser pulses

Cited by 40 publications

References 22 publications

In-situ high-resolution visualization of laser-induced periodic nanostructures driven by optical feedback

In-situ high-resolution visualization of laser-induced periodic nanostructures driven by optical feedback

Formation of Periodic Nanoridge Patterns by Ultrashort Single Pulse UV Laser Irradiation of Gold

Laser-induced ablation of metal in liquid

Contact Info

Product

Resources

About