Large area laser-induced periodic surface structures on steel by bursts of femtosecond pulses with picosecond delays

Giannuzzi, Giuseppe; Gaudiuso, Caterina; Franco, Cinzia Di; Scamarcio, Gaetano; Lugarà, Pietro Mario; Ancona, Antonio

doi:10.1016/j.optlaseng.2018.10.006

Cited by 40 publications

(31 citation statements)

References 36 publications

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“…The morphology of LIPSS is usually related to laser processing parameters such as laser fluence [14], total energy input influences [15], laser repetition frequency [16], laser wavelength [17], scanning speed [18], scanning direction [19], use of laser bursts [20], and processing environment [21]. In general, for linear polarized single-pulse femtosecond laser processing on a single spot, the orientation of LIPSS whose period is near the irradiation wavelength on silicon surfaces is determined by the laser polarization and perpendicular to it in most situations [8].…”

Section: Manipulation Of Lipss Orientation On Silicon Surfaces Using mentioning

confidence: 99%

Manipulation of LIPSS orientation on silicon surfaces using orthogonally polarized femtosecond laser double-pulse trains

Liu¹,

Jiang²,

Han³

et al. 2019

Opt. Express

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Laser-induced periodic surface structures (LIPSS) provide an easy and costeffective means of fabricating gratings and have been widely studied in recent decades. To overcome the challenge of orientation controllability, we developed a feasible and efficient method for manipulating the orientation of LIPSS in real time. Specifically, we used orthogonally polarized and equal-energy femtosecond laser (50 fs, 800 nm) double-pulse trains with time delay about 1ps, total peak laser fluence about 1.0 J/cm 2 , laser repetition frequency at 100 Hz and scanning speed at 150 μm/s to manipulate the LIPSS orientation on silicon surfaces perpendicular to the scanning direction, regardless of the scanning paths. The underlying mechanism is attributed to the periodic energy deposition along the direction of surface plasmon polaritons (SPPs), which can be controlled oriented along the scanning direction in orthogonally polarized femtosecond laser double-pulse trains surface scan processing. An application of structural colors presents the functionality of our method.

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Section: Manipulation Of Lipss Orientation On Silicon Surfaces Using mentioning

confidence: 99%

Manipulation of LIPSS orientation on silicon surfaces using orthogonally polarized femtosecond laser double-pulse trains

Liu¹,

Jiang²,

Han³

et al. 2019

Opt. Express

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“…The transformation of 1D-HSFL to 2D-HSFL has been reported applying DPI [18]. The experimental results underline the key role of the inter-pulse delay (Δτ) [19,20] as well as the effect of pulse, wavelength [21], and polarization [22].…”

Section: Introductionmentioning

confidence: 99%

Double- and Multi-Femtosecond Pulses Produced by Birefringent Crystals for the Generation of 2D Laser-Induced Structures on a Stainless Steel Surface

et al. 2019

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Laser-induced textures have been proven to be excellent solutions for modifying wetting, friction, biocompatibility, and optical properties of solids. The possibility to generate 2D-submicron morphologies by laser processing has been demonstrated recently. Employing double-pulse irradiation, it is possible to control the induced structures and to fabricate novel and more complex 2D-textures. Nevertheless, double-pulse irradiation often implies the use of sophisticated setups for modifying the pulse polarization and temporal profile. Here, we show the generation of homogeneous 2D-LIPSS (laser-induced periodic surface structures) over large areas utilizing a simple array of birefringent crystals. Linearly and circularly polarized pulses were applied, and the optimum process window was defined for both. The results are compared to previous studies, which include a delay line, and the reproducibility between the two techniques is validated. As a result of a systematic study of the process parameters, the obtained morphology was found to depend both on the interplay between fluence and inter-pulse delay, as well as on the number of incident pulses. The obtained structures were characterized via SEM (scanning electron microscopy) and atomic force microscopy. We believe that our results represent a novel approach to surface structuring, primed for introduction in an industrial environment.

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“…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]. The total dose of laser energy, or accumulated fluence, influences the LIPSS formation as well as their morphology [72,73,74,75,76,77,78].…”

Section: Resultsmentioning

confidence: 99%

“…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]. The total dose of laser energy, or accumulated fluence, influences the LIPSS formation as well as their morphology [72,73,74,75,76,77,78].…”

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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Large area laser-induced periodic surface structures on steel by bursts of femtosecond pulses with picosecond delays

Cited by 40 publications

References 36 publications

Manipulation of LIPSS orientation on silicon surfaces using orthogonally polarized femtosecond laser double-pulse trains

Manipulation of LIPSS orientation on silicon surfaces using orthogonally polarized femtosecond laser double-pulse trains

Double- and Multi-Femtosecond Pulses Produced by Birefringent Crystals for the Generation of 2D Laser-Induced Structures on a Stainless Steel Surface

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

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