Photoablation of Polymer Materials

Urech, Lukas; Lippert, Thomas

doi:10.1002/9780470594179.ch14

Cited by 30 publications

(18 citation statements)

References 142 publications

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“…When comparing the shape of the imprints with the theoretical beam profile in the focal plane of a Fresnel zone plate as shown in the upper part of Fig. 1, it becomes obvious that the relation of incoming intensity and imprint depth follows the Beer-Lambert law below p abl < 20, before this simple model breaks down as discussed in Section 1 [11]. In the region of p abl = 20 -40, the behavior is still very close to the non-thermal ablation model, merely the center of the craters seem to be slightly shallower than expected.…”

Section: Ablation Imprintsmentioning

confidence: 95%

“…with d(x,y) denoting the imprint depth, I th the threshold intensity and l at the attenuation length. Note that non-thermal ablation is regarded as the regime where no additional effects play a role except for photon absorption [3,11]. The attenuation length in our experiments was interpolated to 64.3 nm at 47.8 eV from experimental values reported for 38.7 eV (56.9 nm), 57.1 eV (69.9 nm) and 91.8 eV (175 nm) [2,3].…”

Section: Reconstruction Of Intensity Distributionsmentioning

confidence: 99%

“…This is generally the case for non-thermal ablation processes, which are referred to as photochemical models where electronic excitation leads to bond breaking, directly resulting in material loss of the molecular fragments. When the photon fluence reaches higher intensities, cascades of other effects start to play a significant role, such as photothermal ablation as result of bond breaking by photoexcitation and thermal heating, or highly non-linear mechanisms with different bond breaking energies of ground state and excited states [9][10][11]. The use of individual non-thermal ablation imprint craters to determine the intensity distributions is thus limited to a dynamic range from the ablation threshold to the onset of thermal ablation processes [3].…”

Section: Introductionmentioning

confidence: 99%

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High resolution beam profiling of X-ray free electron laser radiation by polymer imprint development

Rösner¹,

Döring²,

Ribič³

et al. 2017

Opt. Express

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High resolution metrology of beam profiles is presently a major challenge at X-ray free electron lasers. We demonstrate a characterization method based on beam imprints in poly (methyl methacrylate). By immersing the imprints formed at 47.8 eV into organic solvents, the regions exposed to the beam are removed similar to resist development in grayscale lithography. This allows for extending the sensitivity of the method by more than an order of magnitude compared to the established analysis of imprints created solely by ablation. Applying the Beer-Lambert law for absorption, the intensity distribution in a micron-sized focus can be reconstructed from one single shot with a high dynamic range, exceeding 10. The procedure described here allows for beam characterization at free electron lasers revealing even faint beam tails, which are not accessible when using ablation imprint methods. We demonstrate the greatly extended dynamic range on developed imprints taken in focus of conventional Fresnel zone plates and spiral zone plates producing beams with a topological charge.

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Section: Ablation Imprintsmentioning

confidence: 95%

Section: Reconstruction Of Intensity Distributionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High resolution beam profiling of X-ray free electron laser radiation by polymer imprint development

Rösner¹,

Döring²,

Ribič³

et al. 2017

Opt. Express

View full text Add to dashboard Cite

show abstract

“…During the last few years, we have observed increased interest in laser ablation techniques and studies. However, only several studies reported about M w influence on polymer properties [13][14][15][16][17][18][19], even though the knowledge of M w values and their effect on polymeric ablation is crucial for laser processing applications. A study focusing on morphological changes of polymethylmethacrylate (PMMA) and (polystyrene) PS of different M w brings Masuhara et al [15].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Polystyrene Doped with Acetylsalicylic Acid and Its Antibacterial Properties

et al. 2020

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Homogeneous polystyrene foils doped with different concentrations of acetylsalicylic acid were prepared by the solvent casting method. The surface morphology and surface chemistry of as-prepared foils were characterized in detail. Excimer laser (krypton fluoride, a wavelength of 248 nm) was used for surface nanopatterning of doped polystyrene foils. Certain combinations of laser fluence and number of laser pulses led to formation of laser-induced periodic surface structures (LIPSS) on the exposed surface. Formation of the pattern was affected by the presence of a dopant in the polystyrene structure. Significant differences in surface chemistry and morphology of laser-treated foils compared to both pristine and doped polystyrene were detected. The pattern width and height were both affected by selection of input excimer exposure conditions, and the amount of 6000 pulses was determined as optimal. The possibility of nanostructuring of a honeycomb-like pattern doped with acetylsalicylic acid was also demonstrated. Selected nanostructured surfaces were used for study the antibacterial properties for a model bacteria strain of S. aureus. The combination of altered surface chemistry and morphology of polystyrene was confirmed to have an excellent antibacterial properties.

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“…For pointing or positioning such a satellite, a few requirements must be fulfilled, i.e., a thrust of 100 µN, low‐thrust noise, and weight, which cannot be achieved with conventional chemical rockets. The functional principle of such a device relies on laser ablation of a propellant in order to generate a plasma jet which provides the thrust. The thrust produced by this plasma is used to propel the satellite.…”

Section: Introductionmentioning

confidence: 99%

Fs Laser‐Induced Plasmas from Energetic Polymers: Towards Micro‐Laser Plasma Thruster Application

Palla-Papavlu

Urech

Lippert

et al. 2015

Plasma Processes & Polymers

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International audienceThe micro-laser plasma thruster (mu-LPT) is a device aimed at orienting and repositioning small satellites above the atmosphere. These devices are based on IR diode lasers utilized for the ablation of polymers and production of thrust for the control of the satellite motion. In this work, different polymer systems, i.e., poly(vinyl chloride) (PVC), glycidyl azide polymer (GAP), and poly(vinyl nitrate) (PVN) with two absorbers, i.e., carbon nanoparticles (C) and an IR-dye (IR), have been investigated for an application in mu-LPT. The properties of a plasma produced by the irradiation of GAP+C, GAP+IR, PVC+C, and PVN+ with 100 fs laser pulses has been investigated by time-resolved plasma imaging and time and space resolved plasma emission spectroscopy

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Photoablation of Polymer Materials

Cited by 30 publications

References 142 publications

High resolution beam profiling of X-ray free electron laser radiation by polymer imprint development

High resolution beam profiling of X-ray free electron laser radiation by polymer imprint development

Nanostructured Polystyrene Doped with Acetylsalicylic Acid and Its Antibacterial Properties

Fs Laser‐Induced Plasmas from Energetic Polymers: Towards Micro‐Laser Plasma Thruster Application

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