2009
DOI: 10.1021/jp807305r
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Interplay between Chemical, Thermal, and Mechanical Processes Occurring upon Laser Excitation of Poly(methyl methacrylate) and Its Role in Ablation

Abstract: Experiments and modeling studies have identified thermal, chemical, and mechanical processes as likely sources of laser ablation in polymeric materials. In our earlier study, molecular dynamics simulations with an embedded Monte Carlo based reaction scheme have been used to investigate the role of each of these processes separately, in a poly(methyl methacrylate) substrate irradiated by ultraviolet lasers. In the present study, using the same substrate, we allow for interactions among these processes, to bette… Show more

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Cited by 11 publications
(9 citation statements)
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“…Ablation thresholds (J/cm 2 ) calculated from the threshold energies and beam waists obtained from fitting the crater diameters as a function of laser energy to the Equation (2). Ablation threshold in terms of laser fluency was calculated from the following well-known equation: Ablation of polymers by ultra-short pulsed laser involves the interplay of several mechanisms of different nature, such as photochemical (bond breaking by laser photons), photothermal (polymer bond breaking by electronic excitation and thermalization) and photomechanical processes (mechanical fractures caused by the high thermoelastic pressure wave induced by laser irradiation) [24]. The extent of each type of mechanism depends on the laser and material properties.…”
Section: Discussionmentioning
confidence: 99%
“…Ablation thresholds (J/cm 2 ) calculated from the threshold energies and beam waists obtained from fitting the crater diameters as a function of laser energy to the Equation (2). Ablation threshold in terms of laser fluency was calculated from the following well-known equation: Ablation of polymers by ultra-short pulsed laser involves the interplay of several mechanisms of different nature, such as photochemical (bond breaking by laser photons), photothermal (polymer bond breaking by electronic excitation and thermalization) and photomechanical processes (mechanical fractures caused by the high thermoelastic pressure wave induced by laser irradiation) [24]. The extent of each type of mechanism depends on the laser and material properties.…”
Section: Discussionmentioning
confidence: 99%
“…In photo-chemical reactions, the energy of the laser causes bond breaks directly at the absorption site. Due to this photofragmentation radicals are created and new molecular entities are formed through chemical degradation and reaction, which leads to ablation of the material [47].…”
Section: Interaction Model For Polymersmentioning
confidence: 99%
“…However, following Prasad et al, the interplay of chemical, thermal and also mechanical processes is still under investigation. For this purpose computational investigations, which means mainly molecular dynamics (MD) simulations, combined with other techniques such as Monte Carlo (MC) algorithms and mesoscopic approaches are employed [47,50,51]. In their investigation, Prasad et al proved by using a combined MD-MC approach that chemical, thermal and mechanical interactions partially couple during laser processing.…”
Section: Interaction Model For Polymersmentioning
confidence: 99%
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“…This technique uses the energy of a focused laser in order to excite a large molecule into the gas phase without degradation. The process a sample undergoes when irradiated with energy above a threshold has been studied in detail [7][8][9][10] and can be described as the surface of the material absorbing the laser and forming a plume of ablated material. This simple description can be modeled in detail and the full process contains contributions from thermal, mechanical, and chemical effects.…”
Section: Introductionmentioning
confidence: 99%