Printing of complex free-standing microstructures via laser-induced forward transfer (LIFT) of pure metal thin films

Feinaeugle, Matthias; Pohl, Ralph; Bor, Teunis Cornelis; Vaneker, Thomas H.J.; Römer, G.R.B.E.

doi:10.1016/j.addma.2018.09.028

Cited by 33 publications

(38 citation statements)

References 27 publications

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“…This could be of great technical significance for printing pixels over a wide range of dimensions without changing the donor film thickness. These results can be compared with those obtained by Feinaeugle et al [38] when printing copper droplet with single pulse LIFT. They used a 6.7 ps pulse duration laser to print droplet with diameter ranging from 1 µm to 4 µm from a 200 nm thick solid film, by varying only the fluence, and they observed similar evolution of the droplet morphology when the fluence increases.…”

Section: Printed Microstructuresmentioning

confidence: 63%

“…Indeed, by varying the femtosecond laser fluence, while keeping all the other parameters constant, lines of droplets with pixel diameters from 1.9 µm to 6.0 µm have been successfully printed from a 1-µm thick solid film. That is an important result, because even if very impressive results have been obtained when printing metal in liquid phase from a solid film in single LIFT [38,40,41], that is difficult to fully get rid of satellites when the fluence is increased to print larger droplets. In terms of fabrication technology, we observed that the solidification process plays a significant role in the printed structure morphologies Micro-columns have also been fabricated with an aspect ratio up to 19 without significant debris.…”

Section: Resultsmentioning

confidence: 99%

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Jetting regimes of double-pulse laser-induced forward transfer

Li¹,

Grojo²,

Alloncle³

et al. 2019

Opt. Mater. Express

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We use the double-pulse laser-induced forward transfer (DP-LIFT) process, combining a quasi-continuous wave (QCW) and a femtosecond (fs) laser pulse to achieve jetting from a 1-µm thick copper film. The influence of the fs laser fluence on the dynamics of the liquid copper jetting is experimentally investigated by time-resolved shadowgraphy and theoretically analyzed with a simple energy balance model. Different jetting regimes are identified when varying the fs laser fluence. We demonstrate that the adjustment of this latter parameter while keeping all the others constant, allows accurate control of the diameter of the printed droplets from 1.9 µm to 6.0 µm. This leads us to a demonstration in which we print debris-free micro-pillars with an aspect ratio of 19 onto a silicon receiver substrate set as far as 60 µm away from the donor film.

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Section: Printed Microstructuresmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Jetting regimes of double-pulse laser-induced forward transfer

Li¹,

Grojo²,

Alloncle³

et al. 2019

Opt. Mater. Express

View full text Add to dashboard Cite

show abstract

“…By utilizing laser fluences above threshold, the shape of the voxels can be controlled where the high ejection velocity causes the droplets to deform and flatten. This effect results in less oxidation and better adhesion to the substrate and to subsequent voxels, allowing for higher aspect sequentially print gold and copper voxels (Feinaeugle et al 2018). These structures are printed layer by layer, and the Cu is selectively etched after printing revealing pure Au 3D microstructures, as seen in Fig.…”

Section: Microstructures: Additive Manufacturing Of Pure Metalsmentioning

confidence: 99%

Laser-Induced Forward Transfer Applications in Micro-engineering

Piqué¹,

Charipar²

2020

Handbook of Laser Micro- And Nano-Engineering

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This chapter describes the laser-induced forward transfer technique, also known as LIFT, and its many applications as an additive micromanufacturing technique for micro-engineering applications. LIFT is a digital printing technique that uses a laser beam to eject material from a donor layer toward a receiving substrate. The laser-transferred material is printed as a 3D pixel or voxel which can be in either solid or liquid form. The first part of this chapter discusses the various configurations under which LIFT can operate and their respective advantages and disadvantages. The second part then provides examples of the wide range of applications available with LIFT, which in turn illustrates the considerable versatility of the technique. The range of applications discussed extend from printed electronics for embedded circuits to bioprinting for tissue engineering.

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“…While most of them are laser removal and surface modification technologies, since the 1980s, laser-induced forward transfer (LIFT) has been developed as a simple and unique additive manufacturing method [1]. By using LIFT, various substances, such as metals [2][3][4][5], semiconductors [6], oxides [7][8][9], silver nanopaste [10][11][12], graphene [13], and biomaterials [14][15][16], can be printed even at a micron/submicron resolution under atmospheric and room-temperature conditions. The LIFT process generally involves the irradiation of a single laser pulse through a transparent support onto 2 of 11 a donor material or a sacrificial layer that absorbs laser light, leading to laser-induced phenomena such as heating, melting, ablation, etc.…”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Forward Transfer with Optical Stamp of a Protein-Immobilized Calcium Phosphate Film Prepared by Biomimetic Process to a Human Dentin

2020

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The rapid and area-specific printing of calcium phosphate with superior biocompatibility and osteoconductivity is a useful technique for the surface functionalization of biomedical devices. We recently demonstrated the laser-induced forward transfer (LIFT) of a brittle calcium phosphate film onto a soft and shock-absorbing polydimethylsiloxane (PDMS) substrate. In this work, a new LIFT using an optically transparent PDMS-coated stamp, which we hereafter call LIFT with optical stamp (LIFTOP), was introduced to achieve the transfer of brittle films to harder substrates. Cell adhesion protein fibronectin-immobilized calcium phosphate films (Fn-CaP) were prepared on the optical stamp through a biomimetic process. Then, the irradiation of a single laser pulse transferred the Fn-CaP film from the optical stamp onto relatively hard substrates, polyethylene terephthalate and human dentin. As a result of this LIFTOP process, Fn-CaP microchips with a shape corresponding to the laser beam spot were printed on the substrates. Cross-sectional observation of the interface between the Fn-CaP microchip and the dentin substrate revealed good attachment between them without obvious gaps for the most part.

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Printing of complex free-standing microstructures via laser-induced forward transfer (LIFT) of pure metal thin films

Cited by 33 publications

References 27 publications

Jetting regimes of double-pulse laser-induced forward transfer

Jetting regimes of double-pulse laser-induced forward transfer

Laser-Induced Forward Transfer Applications in Micro-engineering

Laser-Induced Forward Transfer with Optical Stamp of a Protein-Immobilized Calcium Phosphate Film Prepared by Biomimetic Process to a Human Dentin

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