Photophysical ablation of organic polymers: the influence of stresses

Luk’yanchuk, Boris; Bityurin, N.; Анисимов, С. И.; Malyshev, A. Yu.; Arnold, N.; Bäuerle, D.

doi:10.1016/s0169-4332(96)00366-2

Cited by 18 publications

(10 citation statements)

References 11 publications

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“…Laser ablation has been extensively studied, both theoretically [22,23] and experimentally. Several models have been proposed for ablation of polymers, involving photochemical effects (direct bond breaking) [24][25][26][27][28], photothermal effects (thermally broken bonds) [29][30][31][32], photophysical (mechanical stress) [33] or a combination of them. Many investigations were published on the ablation of polymers but, up to now, mainly for thick films (micrometer range or thicker).…”

Section: Introductionmentioning

confidence: 99%

Influence of thermal diffusion on the laser ablation of thin polymer films

et al. 2007

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The laser ablation of a photosensitive triazene polymer was investigated with a ns XeCl excimer laser over a broad range of thicknesses (10-400 nm). We found that the ablation threshold fluence increased dramatically with decreasing film thickness for films thinner than 50 nm. Ablation on substrates with different thermal properties (sapphire, fused silica, PMMA) was investigated as well, and a clear influence of the substrate material was obtained. A mathematical model combining thermal diffusion and absorption effects was used to explain the experimental data. The model is in good agreement with the experimental data and shows that heat diffusion into the substrate plays a crucial role for the ablation process of very thin films.PACS 52.38.Mf; 44.05.+e; 81.05.Lg IntroductionLaser ablation finds a broad range of applications because it allows us to create microstructures by dry etching, deposit material from a target to a substrate, perform analysis of fragments and is also used for some special applications, such as laser plasma thrusters [1,2].Material deposition by laser ablation is a useful tool in the field of materials processing. The pulsed laser deposition (PLD) technique allows us to transfer and produce films of inorganic [3,4] and organic materials [5][6][7][8]. Matrix-assisted pulsed laser evaporation (MAPLE) can be applied to transfer small molecules from a frozen matrix to a substrate [8,9]. One of the most promising techniques to transfer organic thin films is laser-induced forward transfer (LIFT), which allows us to deposit and pattern materials in the same process [10][11][12][13][14]. It consists of the following steps: a transparent substrate is coated with the material that has to be transferred. This so-called donor substrate is placed in front of a receiver plate and a laser pulse is applied through the donor. The coated material absorbs the laser pulse and is ablatively ejected and deposited on the receiver. This method is appropriate for metal deposition but not for sensitive materials, such as polymers, because these may be damaged by the thermal load and photochemical reactions due to irradiation. A modification of the technique can solve this problem. The principle is the application of a twolayer system: a sacrificial layer acting as an absorber and the transfer material are successively coated on the donor substrate. Upon receiving the laser pulse, the sacrificial layer absorbs the energy, is decomposed into gaseous fragments and provides the thrust for propelling the top layer onto the receiver [15]. Furthermore, the absorbing material protects the top layer from the laser pulse and is specially designed to decompose at low fluences. Among various polymers, triazenebased polymers (TP) show the lowest ablation threshold at 308 nm and are therefore the most promising materials for this application [16][17][18].It has been shown that this sacrificial layer allows us to transfer quantum dots [19], living cells embedded in a matrix [20] and even functional pixels of organic ligh...

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Section: Introductionmentioning

confidence: 99%

Influence of thermal diffusion on the laser ablation of thin polymer films

et al. 2007

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“…In particular, the role of a so-called "phase explosion" mechanism was discussed [113,114,115]. In addition, photo-physical ablation of organic polymer materials was examined [116].…”

Section: Fundamentals Of Laser-matter Interactionsmentioning

confidence: 99%

Nanoparticle Generation by Double-Pulse Laser Ablation

Axente¹,

Itina²,

Hermann³

2018

Pulsed Laser Ablation

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The purpose of this chapter is to give a critical review of the processes involved in the generation of nanoparticles by material ablation with two time-delayed laser pulses. Experimental investigations of the ablation characteristics during nanoparticle synthesis with short double pulses are presented. In particular, the composition and the expansion dynamics of the ablated material are examined. The latest progress achieved in modeling laser-matter interactions in double pulse regime is discussed. The correlation between ablation efficiency and nanoparticle generation is assessed and compared with numerical simulations, the influence of interpulse delay on metals ablation being revealed.

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“…They can be divided into photochemical models [65][66][67][68][69][70], photothermal models [71][72][73][74], and photophysical models [75]. They can be divided into photochemical models [65][66][67][68][69][70], photothermal models [71][72][73][74], and photophysical models [75].…”

Section: Ablation Mechanismmentioning

confidence: 99%

Laser Ablation and Thin Film Deposition

Schneider

Lippert²

2010

Laser Processing of Materials

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One of the most versatile deposition techniques in solid-state physics and analytical chemistry is the vaporization of condensed matter using photons. A shortpulsed high-power laser beam is focused onto a sample surface thereby converting a finite volume of a solid instantaneously into its vapor phase constituents such as ions and neutrals. Subsequently, the vapor moves away from the target at a high velocity and can be sampled either to grow a film or being analyzed by various spectroscopic techniques. In this chapter, the focus is on general properties of pulsed laser ablation relevant for solid-state physics like the initial ablation processes, plume formation, and plume properties. Next, oxide thin film growth will be discussed and the growth of LaAlO 3 /SrTiO 3 heterostructures is presented as one example of tailoring oxide interfaces with surprising properties. The final discussion is on the topic of polymer ablation.

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Photophysical ablation of organic polymers: the influence of stresses

Cited by 18 publications

References 11 publications

Influence of thermal diffusion on the laser ablation of thin polymer films

Influence of thermal diffusion on the laser ablation of thin polymer films

Nanoparticle Generation by Double-Pulse Laser Ablation

Laser Ablation and Thin Film Deposition

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