From ripples to spikes: A hydrodynamical mechanism to interpret femtosecond laser-induced self-assembled structures

Tsibidis, George D.; Fotakis, C.; Stratakis, Emmanuel

doi:10.1103/physrevb.92.041405

Cited by 231 publications

(236 citation statements)

References 62 publications

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“…While SPP excitation at a metal/air interface is reported to lead to periodic ripple patterns similar to those induced by linearly polarized beams [15][16][17][18][19][20][21], only a few studies have been performed to correlate the characteristics of the CVB with induced morphological changes [22,23]. Nevertheless, a detailed exploration of the physical mechanisms that lead to surface modification induced upon irradiation with CVB ( Fig.1) has yet to be considered (i.e.…”

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“…Corrugated surfaces could also allow SPP excitation [19,25,26] and correlation of morphological characteristics of the irradiated zone (corrugation height/amplitude, δ and grating periodicity, Λ) with the magnitude of the longitudinal wavevector of the SPP requires a systematic analysis of the propagation of the respective electromagnetic field [19,21]. In this context, the spatio-temporal distribution of the electric field is modelled assuming a surface profile that is determined by the approximating function (where r=(x 2 +y 2 …”

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Ripple formation on nickel irradiated with radially polarized femtosecond beams

2015

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We report on the morphological effects induced by the inhomogeneous absorption of radially polarized femtosecond laser irradiation of nickel (Ni) in subablation conditions. A theoretical prediction of the morphology profile is performed and the role of surface plasmon excitation in the production of self-formed periodic ripples structures is evaluated. Results indicate a smaller periodicity of the ripples profile compared to that attained under linearly polarized irradiation conditions. A combined hydrodynamical and thermoelastic model is presented in laser beam conditions that lead to material melting. The simulation results are presented to be in good agreement with the experimental findings. The ability to control the size of the morphological changes via modulating the beam polarization may provide an additional route for controlling and optimizing the outcome of laser microprocessing.

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Ripple formation on nickel irradiated with radially polarized femtosecond beams

2015

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“…20 Concerning the formation mechanism of spikes, i.e. conical quasi periodical structures that can be induced on metals 1,21 and semiconductors, 22 several studies have been carried out on controlling their size 21,23 and two distinct mechanisms are proposed to lead to spike formation. For metals irradiated with femtosecond pulses with u-ence values close to the ablation threshold, the interpretation of spike formation is based on the ablation around surface defects.…”

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Generation of micro- and nano-morphologies on a stainless steel surface irradiated with 257 nm femtosecond laser pulses

et al. 2018

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a Surface structuring by femtosecond lasers has emerged as an efficient tool to functionalize the surfaces of various solid materials. Laser induced periodic surface structures (LIPSS) can drastically impact the wetting, friction and optical properties of the surface depending on the size, aspect ratio and period of the structures. Morphological characteristics in the nanoscale, such as nano roughness, contributing to a hierarchical surface formation are considered to have a significant impact on those properties. In this study, we demonstrate for the first time to our knowledge the feasibility of inducing ripples and spikes utilizing a 257 nm femtosecond laser. LIPSS with a period smaller than 200 nm were realised.Furthermore, we show the evolution of those structures into conical spikes for this wavelength, and we provide an interpretation on their formation. Finally, we show that sub 200 nm LIPSS can create subwavelength gratings providing non-angular dependent light reflection and non-periodic morphologies showing super hydrophobic behaviour.

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“…First of all, at lower energy doses, Marangoni convection, driven by the high thermal gradients generated by ultrafast laser-matter interaction, has been proposed as the dominant physical process that occurs [51]. At higher E, the common idea is that the surface morphology is the result of a modulated energy deposition due to the interference between the laser pulses and surface plasmon polaritons (SPP).…”

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Design and characterization of textured surfaces for applications in the food industry

Lazzini¹,

Romoli²,

Blunt³

et al. 2017

Surf. Topogr.: Metrol. Prop.

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Description of two-process surface topography W Grabon and P Pawlus -A study of variations of areal parameters on machined surfaces P Pawlus, W Grabo, R Reizer et al. AbstractThe aim of this work is to design, manufacture and characterize surface morphologies on AISI 316L stainless steel produced by a custom designed laser-texturing strategy. Surface textures were characterized at a micrometric dimension in terms of areal parameters compliant with ISO 25178, and correlations between these parameters and processing parameters (e.g. laser energy dose supplied to the material, repetition rate of the laser pulses and scanning velocity) were investigated. Preliminary efforts were devoted to the research of special requirements for surface morphology that, according to the commonly accepted research on the influence of surface roughness on cellular adhesion on surfaces, should discourage the formation of biofilms. The topographical characterization of the surfaces was performed with a coherence scanning interferometer. This approach showed that increasing doses of energy to the surfaces increased the global level of roughness as well as the surface complexity. Moreover, the behavior of the parameters S pk , S vk also indicates that, due to the ablation process, an increase in the energy dose causes an average increase in the height of the highest peaks and in the depth of the deepest dales. The study of the density of peaks S pd showed that none of the surfaces analyzed here seem to perfectly match the conditions dictated by the theories on cellular adhesion to confer anti-biofouling properties. However, this result seems to be mainly due to the limits of the resolving power of coherence scanning interferometry, which does not allow the resolution of submicrometric features which could be crucial in the prevention of cellular attachment.

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From ripples to spikes: A hydrodynamical mechanism to interpret femtosecond laser-induced self-assembled structures

Cited by 231 publications

References 62 publications

Ripple formation on nickel irradiated with radially polarized femtosecond beams

Ripple formation on nickel irradiated with radially polarized femtosecond beams

Generation of micro- and nano-morphologies on a stainless steel surface irradiated with 257 nm femtosecond laser pulses

Design and characterization of textured surfaces for applications in the food industry

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