Finite-difference Time-domain Modeling of Laser-induced Periodic Surface Structures

Römer, G.R.B.E.; Skolski, J.Z.P.; Oboňa, Jozef Vincenc; Veld, A.J. Huis in't

doi:10.1016/j.phpro.2014.08.058

Cited by 19 publications

(13 citation statements)

References 38 publications

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“…High spatial frequency LIPSS (HSFL) can be observed in perpendicular direction to the LSFL (inset in Figure 1b). [ 44 ] In the last case, the measured lateral size of the HSFL was 200 nm. Thus, both DLIP samples consist of hierarchical micro/nanostructured surfaces.…”

Section: Resultsmentioning

confidence: 99%

“…[ 43 ] LIPSS are self‐organized surface features usually generated with fluences close to or slightly above the ablation threshold. [ 44 ] By optimizing the energy transferred to the surface, sub‐micrometer features or hierarchical micro/nanoscale features can be fabricated. [ 45 ] On the other hand, DLIP relies its principle on the overlap of multiple coherent laser beams to generate defined interference patterns within the laser beam profile and to produce features in the micro‐ and sub‐micrometer scale.…”

Section: Introductionmentioning

confidence: 99%

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Design Rules for Laser‐Treated Icephobic Metallic Surfaces for Aeronautic Applications

Vercillo

Tonnicchia

Romano

et al. 2020

Adv Funct Materials

128

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Ice accretion on external aircraft surfaces due to the impact of supercooled water droplets can negatively affect the aerodynamic performance and reduce the operational capability and, therefore, must be prevented. Icephobic coatings capable of reducing the adhesion strength of ice to a surface represent a promising technology to support thermal or mechanical ice protection systems. Icephobicity is similar to hydrophobicity in several aspects and superhydrophobic surfaces embody a straightforward solution to the ice adhesion problem. Short/ultrashort pulsed laser surface treatments are proposed as a viable technology to generate superhydrophobic properties on metallic surfaces. However, it has not yet been verified whether such surfaces are generally icephobic under representative icing conditions. This study investigates the ice adhesion strength on Ti6Al4V, an alloy commonly used for aerospace components, textured by means of direct laser writing, direct laser interference patterning, and laser-induced periodic surface structures laser sources with pulse durations ranging from nano-to femtosecond regimes. A clear relation between the spatial period, the surface microstructure depth, and the ice adhesion strength under different icing conditions is investigated. From these observations, a set of design rules can be defined for superhydrophobic surfaces that are icephobic, too.can reduce dramatically lift and increase drag, influencing the maneuverability of the aircraft. Ice protection systems (IPS) are installed to allow aircraft flying safely in icing conditions. At the present time, IPS are not supported by coatings or surfaces that facilitate the ice removal-due to the still too low maturity and robustness of such technological solutions. Yet, surface functionalization is a promising strategy for manufacturing icephobic surfaces [3] aiming to delay ice accretion and/ or to reduce ice adhesion [4,5] and therefore to reduce the electrical or thermal energy required by the IPS.In the last two decades, several approaches for producing icephobic surfaces were presented in literature. For example, it has been proven that polishing the surfaces can reduce the mechanical interlocking with the accreted ice, hence facilitating the ice removal. [5] Coatings can lower the surface free energy and thus reduce the strength of the bonding between ice and surface. [6] On slippery liquid-infused porous surfaces the supercooled water droplets impinge on a liquid instead of a solid surface, which offers a double advantage: interfacial slippage of water or ice occurs (nonzero slip velocity)-which reduces ice adhesion [7] -and interlocking of ice with a liquid interface cannot occur. However, employing coatings or chemicals to

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design Rules for Laser‐Treated Icephobic Metallic Surfaces for Aeronautic Applications

Vercillo

Tonnicchia

Romano

et al. 2020

Adv Funct Materials

128

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“…Differently, smaller periodic structures, with a spatial period of approximately 120 nm, observed between the LSFLs are generally classified as high spatial frequency LIPSS (HSFL). This type of LIPSS was observed on several metals when applying ultra-short laser pulses with durations in the femtosecond and picosecond range [65,82]. Since the orientation of HSFLs is parallel to the laser polarization, they cannot be explained via SPP excitation [79,83].…”

Section: Resultsmentioning

confidence: 98%

“…LIPSS [65,66,67,68], a universal phenomenon that occurs after laser irradiation on a wide number of different materials [69,70,71], have been found to exhibit different characteristic shapes, including ripples (lines), rods, cones, grooves, etc. The generation of LIPSS takes place commonly only in a fluence range close to the material damage threshold and even just below the ablation threshold [72].…”

Section: Resultsmentioning

confidence: 99%

“…The periodic ripples are oriented perpendicular to the laser polarization (double arrow in Figure 6a) and have an average spatial period of 410 nm, representing 77% of the laser wavelength. This type of LIPSS is commonly referred to as low spatial frequency LIPSS (LSFLs), which are usually assumed to be generated by the excitation of surface plasmon polaritons (SPP) [60,65,72,79,80,81]. Differently, smaller periodic structures, with a spatial period of approximately 120 nm, observed between the LSFLs are generally classified as high spatial frequency LIPSS (HSFL).…”

Section: Resultsmentioning

confidence: 99%

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Picosecond Laser Interference Patterning of Periodical Micro-Architectures on Metallic Molds for Hot Embossing

Soldera

Wang

et al. 2019

Materials

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In this work, it is demonstrated that direct laser interference patterning (DLIP) is a method capable of producing microtextured metallic molds for hot embossing processes. Three different metals (Cr, Ni, and Cu), relevant for the mold production used in nanoimprinting systems, are patterned by DLIP using a picosecond laser source emitting at a 532 nm wavelength. The results show that the quality and surface topography of the produced hole-like micropatterns are determined by the laser processing parameters, such as irradiated energy density and the number of pulses. Laser-induced periodic surface structures (LIPSS) are also observed on the treated surfaces, whose shapes, periodicities, and orientations are strongly dependent on the accumulated fluence. Finally, the three structured metals are used as embossing molds to imprint microlenses on polymethyl methacrylate (PMMA) foils using an electrohydraulic press. Topographical profiles demonstrate that the obtained structures are comparable to the masters showing a satisfactory reproduction of the texture. The polymeric microlens arrays that showed the best surface homogeneity and overall quality were those embossed with the Cr molds.

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Relaxation dynamics of femtosecond-laser-induced temperature modulation on the surfaces of metals and semiconductors

Lévy

Derrien

Bulgakova

et al. 2016

Applied Surface Science

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Finite-difference Time-domain Modeling of Laser-induced Periodic Surface Structures

Cited by 19 publications

References 38 publications

Design Rules for Laser‐Treated Icephobic Metallic Surfaces for Aeronautic Applications

Design Rules for Laser‐Treated Icephobic Metallic Surfaces for Aeronautic Applications

Picosecond Laser Interference Patterning of Periodical Micro-Architectures on Metallic Molds for Hot Embossing

Relaxation dynamics of femtosecond-laser-induced temperature modulation on the surfaces of metals and semiconductors

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