Shock-wave-induced Thin-film Delamination (SWIFD): A Non-thermal Structuring Method of Functional Layers
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Pierre Lorenz, Martin Ehrhardt, Lukas Bayer, Klaus Zimmer The laser structuring of thermally sensitive functional layers is a challenge for laser methods. However, already ultrashort laser pulses can induce thermal modifications. The spatial separation of the laser pulse absorption from the functional layer removal process allows a non-thermal structuring process. Therefore, the rear side of the substrate is irradiated and the following laser ablation process induces a transverse shock wave through the substrate. Finally, the interaction of the shoc...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Everlasting Dark Printing on Alumina by Laser
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): J. Penide, F. Quintero, F. Arias-González, A. Fernández, J. del Val, R. Comesaña, A. Riveiro, F. Lusquiños, J. Pou Marks or prints are needed in almost every material, mainly for decorative or identification purposes. Despite alumina is widely employed in many different industries, the need of printing directly on its surface is still a complex problem. In this sense, lasers have largely demonstrated their high capacities to mark almost every material including ceramics, but performing dark permanent marks on alumina is still an open challe...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Laser-induced Coloring on Small Titanium Surfaces
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Roberto Ocaña, Arnau Calatayud Coloring of titanium surfaces by laser is a technique quite sensitive to small changes of the processing parameters. The specification of power stability, scanner speed, average power, hatching, pattern, etc. as well as the optical characteristics of the laser beam play an important role for the final resulting color. All these parameters need to be explored and optimized in order to obtain reproducible results on the same workpiece. Here we demonstrate that coloring of small titanium and Ti6Al4 V alloy parts is possibl...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Laser Encapsulation of Organic Electronics with Adapted Diode Lasers in Flexible Production Processes
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Maximilian Brosda, Alexander Olowinsky, Alexander Pelzer Flexible organic electronics such as OLPV and OLED modules are highly sensitive against water and oxygen. To protect them against the environment and to ensure a long lifetime visual transparent ultra high barrier films are used for the encapsulation process. These multilayer films usually consist of a polymer substrate on which, depending on the requirements, various functional layers are applied. The organic device is then fully packed in this films. Instead of conventional joining these film...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Improvement in Surface Characterisitcs of Polymers for Subsequent Electroless Plating Using Liquid Assisted Laser Processing
In this study, a comparison of the surface characteristics obtained by laser processing in water vis-à-vis air along with the deposition characteristics are presented. In addition, a numerical model based on the finite volume method is developed to predict the temperature profile during the process. Based on the model results, it is hypothesized that physical phenomena such as vapor bubble generation and plasma formation may occur in the presence of water, and it is because of these effects that causes an increase in surface porosity. (Source: Physics Procedia)
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Laser Induced Forward Transfer of High Viscosity Silver Paste for New Metallization Methods in Photovoltaic and Flexible Electronics Industry
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Y. Chen, D. Munoz-Martin, M. Morales, C. Molpeceres, E. Sánchez-Cortezon, J. Murillo-Gutierrez Laser Induced Forward Transfer (LIFT) has been studied in the past as a promising approach for precise metallization in electronics using metallic inks and pastes. In this work we present large area metallization using LIFT of fully commercial silver-based pastes initially designed for solar cell screen-printing. We discuss the mechanisms for the material transfer both in ns and ps regimes of irradiation of these high viscosity materials, and the potent...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Direct Write Processing of Multi-micron Thickness Copper Nano-particle Paste on Flexible Substrates with 532 nm Laser Wavelength
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Dunia Lopez-Espiricueta, Eamonn Fearon, Stuart Edwardson, Geoffrey Dearden The Laser Assisted Direct Write (LA-DW) method has been implemented in the development of different markets and material processing, recently also used for creating Printed Circuit Boards (PCB) or electrical circuitry. The process consists in the deposition of metallic nano-particle (NP) inks, which are afterwards cured or sintered by laser irradiation, thus creating conductive pathways; advantages are speed, accuracy and the protection of the heat affected zone (HAZ). This r...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
High Resolution Fabrication of Interconnection Lines Using Picosecond Laser and Controlled Deposition of Gold Nanoparticles
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Asaf Shahmoon, Johnnes Strauß, Hadar Zafri, Michael Schmidt, Zeev Zalevsky In this paper we present the fabrication procedure as well as the preliminary experimental results of a novel method for construction of high resolution nanometric interconnection lines. The fabrication procedure relies on a self-assembly process of gold nanoparticles at specific predetermined nanostructures. The nanostructures for the self-assembly process are based on the focused ion beam (FIB) or scanning electron beam (SEM) technology. The assembled nanoparticles are be...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Formation Monocrystalline Carbon Micro-and Nanostructures Under Femtosecond Laser Irradiation of graphite in Liquid Nitrogen
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Kirill S. Khorkov, Dmitrii V. Abramov, Dmitriy A. Kochuev, Sergey M. Arakelian, Valery G. Prokoshev The combination of high energy and ultra short duration of femtosecond laser pulses allow to reach in the area of impact the local conditions which can change the phase composition of irradiated material. Traditional methods of structural phase transformation of the graphite at high pressures do not provide the abrupt simultaneous cancellation of the applied pressure and temperature. As a result, some of the synthesized nanostructures and metastable ...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Ultra-fast Micro Machining of Cylindrical Parts with Multiple Ultra- Short Pulsed Laser Sources
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Stephan Bruening, Keming Du, Arnold Gillner Ultra-short pulsed lasers (pulse width 10ps) with high pulse repetition rates (1-8MHz) provide the possibility to process different kind of microstructures and sub-microstructures for generating surface functionalities. Several developments in the last years were focused on increasing the pulse repetition rate in combination with a higher scanning velocity to maximize the throughput. These methods are useful for a specific pulse rep.-rate / scan speed combination, but many technical barriers limit economic ...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Experimental Study on Micro Hole Drilling Using Ultrashort Pulse Laser Radiation
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Andreas Gruner, Joerg Schille, Udo Loeschner This paper discusses latest results obtained in micro hole percussion drilling in stainless steel. In the investigations a femtosecond laser source was used emitting 220 fs pulses at 1.03μm wavelength, whereas the spot size amounted to 31μm. Thereby, important process parameters like pulse energy, pulse repetition frequency, and pulse number were varied over a wide range in order to evaluate their influence both on the micro hole geometry like hole diameter, roundness, taper angle, and on the drilling qu...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Processing of Polyamide Electrospun Nanofibers with Picosecond Uv-laser Irradiation
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Marco Götze, Olaf Krimig, Tobias Kürbitz, Sven Henning, Andreas Heilmann, Georg Hillrichs To optimize the cell colonization on electrospun polyamide nanofibers, the fiber scaffolds were processed with picosecond uv-laser irradiation. The ablation thresholds were determined in dry, wet and immersed condition. The morphology of the ablated areas was evaluated by confocal and scanning electron microscopy. It was found that the ablation thresholds of the nanofiber tissues are lower as for polyamide bulk material. While on bulk samples the ablation s...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Influence of an Angular Hatching Exposure Strategy on the Surface Roughness During Picosecond Laser Ablation of Hard Materials
In conclusion guidelines are derived which present favorable settings for high quality laser ablation processes. (Source: Physics Procedia)
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Influence of Pulse Bursts on the Specific Removal Rate for Ultra-fast Pulsed Laser Micromachining of Copper
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Thorsten Kramer, Beat Neuenschwander, Beat Jäggi, Stefan Remund, Urs Hunziker, Josef Zürcher Compared to single pulses the utilization of pulse bursts on steel samples was reported to be more efficient. But with regards to the specific removal rate it can be shown that a maximum value is achieved when the applied peak fluence equals exp(2) times the threshold fluence. The higher reported efficiency is caused by the reduced energy of the single pulses nearer to the optimum value. Recent investigations on the application of pulse bursts on copper ...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Influence of the Liquid on Femtosecond Laser Ablation of Iron
We present our studies on the efficiency and quality of ablated grooves in water, methanol, acetone, ethanol and toluene. The produced grooves are investigated by means of white-light interferometry, EDX and SEM. (Source: Physics Procedia)
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
