The role of asymmetric excitation in self-organized nanostructure formation upon femtosecond laser ablation
- Brandenburgische Technische Universitaet (BTU) Cottbus Platz der Deutschen Einheit 1, 03046 Cottbus (Germany)
Surface pattering upon multi-pulse femtosecond laser ablation is modeled by a non-linear-dynamic erosion/smoothing model, similar to structure formation during ion sputtering. The model is adopted to account for the influence of laser polarization on nanostructure features. Based on a nonlinear equation of the Kuramoto-Siavshinsky type, it is shown that the directional anisotropy in the pattern formation may result from a spatial anisotropy of the initial excitation/energy-coupling process, such as resonant coupling to surface plasmons/polaritons, or electron diffusion properties. Also, anisotropy of elasto-dynamic surface and diffusion properties may be involved. A comparison of numeric simulations based on the model with corresponding experi-mental results gives a very good agreement.
- OSTI ID:
- 22069148
- Journal Information:
- AIP Conference Proceedings, Vol. 1464, Issue 1; Conference: International symposium on high power laser ablation 2012, Santa Fe, NM (United States), 30 Apr - 3 May 2012; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ABLATION
ANISOTROPY
CALCIUM COMPOUNDS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
CORROSION
DIFFUSION
EXCITATION
ION BEAMS
NANOSTRUCTURES
NONLINEAR PROBLEMS
NUMERICAL ANALYSIS
PLASMONS
POLARIZATION
POLARONS
SEMICONDUCTOR MATERIALS
SILICON
SPUTTERING
SURFACE TREATMENTS