Self‐organized regular surface patterning by pulsed laser ablation

Reif, J.; Costache, Florenţa; Varlamova, Olga; Jia, Guobin; Ratzke, Markus

doi:10.1002/pssc.200880719

Cited by 46 publications

(27 citation statements)

References 21 publications

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“…47 Additionally, a feedback mechanism has been proposed to be involved, and LIPSS become fully developed only after a sufficient number of laser pulses have been applied to the polymer surface. 15,[48][49][50] However no information is available on the kinetics of LIPSS formation and the influence of pulse repetition rate has not been previously assessed in detail.…”

Section: Mechanism Of Lipss Formationmentioning

confidence: 99%

In Situ Monitoring of Laser-Induced Periodic Surface Structures Formation on Polymer Films by Grazing Incidence Small-Angle X-ray Scattering

et al. 2015

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Citation: REBOLLAR, E. ... et al., 2015. In situ monitoring of laser-induced periodic surface structures formation on polymer films by grazing incidence small-angle X-ray scattering. Langmuir, 31 (13), pp. 3973 -3981.Additional Information:• This paper was accepted for publication in the journal Langmuir [ c The formation of Laser Induced Periodic Surface Structures (LIPSS) on model spin-coated polymer films has been followed in situ by Grazing Incidence Small Angle X-ray Scattering (GISAXS) using synchrotron radiation. The samples were irradiated at different repetition rates ranging from 1 up to 10 Hz by using the 4th harmonic of a Nd:YAG laser (266 nm) with pulses of 8 ns. Simultaneously GISAXS patterns were acquired during laser irradiation. The variation of both the GISAXS signal with the number of pulses and the LIPSS period with laser irradiation time is revealing key kinetic aspects of the nanostructure formation process. By considering 2 LIPSS as one-dimensional paracrystalline lattice and using a correlation found between the paracrystalline disorder parameter, g, and the number of reflections observed in the GISAXS patterns, the variation of the structural order of LIPSS can be assessed. The role of the laser repetition rate in the nanostructure formation has been clarified. For high pulse repetition rates (i.e. 10 Hz), LIPSS evolve in time to reach the expected period matching the wavelength of the irradiating laser. For lower pulse repetition rates LIPSS formation is less effective and the period of the ripples never reaches the wavelength value. Results support and provide information on the existence of a feedback mechanism for LIPSS formation in polymer films.

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Section: Mechanism Of Lipss Formationmentioning

confidence: 99%

In Situ Monitoring of Laser-Induced Periodic Surface Structures Formation on Polymer Films by Grazing Incidence Small-Angle X-ray Scattering

et al. 2015

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“…Instead of having a uniform symmetry, the herringbone LIPSSs we produce have axial symmetry along the channel they form along and are orientated at an acute angle to the polarization, as opposed to standard LIPSSs, which tend to form either perpendicular or parallel to the laser's polarization [26]. Spatially modulated LIPSSs have been observed by others before, by producing periodic structures with differing orientation in different spatial locations [21,27,28]. However, unlike other spatially modulating LIPSS structures, herringbone LIPSSs are produced using only a single beam and form with axially symmetry.…”

Section: Introductionmentioning

confidence: 98%

Femtosecond laser-induced herringbone patterns

2018

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Femtosecond laser-induced herringbone patterns are formed on copper (Cu). These novel periodic structures are created following s-polarized, large incident angle, femtosecond laser pulses. Forming as slanted and axially symmetric laser-induced periodic surface structures along the side walls of ablated channels, the result is a series of v-shaped structures that resemble a herringbone pattern. Fluence mapping, incident angle studies, as well as polarization studies have been conducted and provide a clear understanding of this new structure.

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“…12 The question of the initial conditions required for the ripples formation is therefore complex, especially since the launching mechanisms are not yet accessible to observations. For instance, it is not known if the periodicity of these structures is a consequence of laser light modulations at the beginning of the interaction, due to some instabilities occurring during the liquid phase and frozen by the resolidification, 13 or an association of these two processes. To decide which mechanisms are effective during ripples formation and to establish a suitable scenario, one possibility is to compare experimental conditions and materials with different intrinsic properties and to deduce how metal features could impact on the end results.…”

Section: Introductionmentioning

confidence: 99%

Effects of electron-phonon coupling and electron diffusion on ripples growth on ultrafast-laser-irradiated metals

Colombier

Garrelie

Faure

et al. 2012

Journal of Applied Physics

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International audienceMetals exposed to ultrafast laser irradiation close to ablative regimes show often a submicron-scale (near 0.5 μm) periodic organization of the surface as ripples. Using two classes of metallic materials (transition and noble), we have determined that the ripples amplitude is strongly correlated to the material transport properties, namely electron-phonon relaxation strength, electronic diffusion, and to the energy band characteristics of the electronic laser excitation. This particularly depends on the topology of the electronic structure, including d-band effects on electronic excitation. Comparing the effects of electron-phonon nonequilibrium lifetimes for the different metals under similar irradiation conditions, we indicate how the electron-phonon coupling strength affects the electronic thermal diffusion, the speed of phase transformation and impacts on the ripples contrast. The highest contrast is observed for ruthenium, where the electron-phonon coupling is the strongest, followed by tungsten, nickel, and copper, the latter with the least visible contrast. The dependence of surface patterns contrast with fluence is linked to the dependence of the relaxation characteristics with the electronic temperature

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Self‐organized regular surface patterning by pulsed laser ablation

Cited by 46 publications

References 21 publications

In Situ Monitoring of Laser-Induced Periodic Surface Structures Formation on Polymer Films by Grazing Incidence Small-Angle X-ray Scattering

In Situ Monitoring of Laser-Induced Periodic Surface Structures Formation on Polymer Films by Grazing Incidence Small-Angle X-ray Scattering

Femtosecond laser-induced herringbone patterns

Effects of electron-phonon coupling and electron diffusion on ripples growth on ultrafast-laser-irradiated metals

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