Laser-matter structuration of optical and biological materials
| Autor: | Guillaume Duchateau, A. Souquet, A. Bourgeade, C. Mézel, David Hebert, B. Chimier, C. Regan, L. Hallo, Fabien Guillemot |
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| Rok vydání: | 2012 |
| Předmět: |
Free electron model
Materials science business.industry General Physics and Astronomy Surfaces and Interfaces General Chemistry Rate equation Dielectric Nanosecond Condensed Matter Physics Laser Surfaces Coatings and Films law.invention symbols.namesake Optics Maxwell's equations law Femtosecond symbols Atomic physics business Absorption (electromagnetic radiation) |
| Zdroj: | Applied Surface Science. 258:9263-9269 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2011.11.117 |
| Popis: | Interaction of ultrafast laser, i.e. from the femtosecond (fs) to the nanosecond (ns) regime, with initially transparent matter may produce very high energy density hot spots in the bulk as well as at the material surface, depending on focusing conditions. In the fs regime, absorption is due to ionisation of the dielectric, which enables absorption process to begin, and then hydrodynamic to take place. In the ns regime both absorption and hydrodynamic are coupled to each other, which complexifies considerably the comprehension but matter structuration looks similar. A numerical tool including solution of 3D Maxwell equations and a rate equation for free electrons is first compared to some available simple models of laser energy absorption. Then, subsequent material deformation, i.e. structuration, is determined by solving hydrodynamic equations, including or not solid behaviour. We show that nature of the final structures strongly depends on the amount of deposited energy and on the shape of the absorption zone. Then we address some problems related to laser-matter structuration of optical and biological materials in the fs, ps and ns regimes. |
| Databáze: | OpenAIRE |
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