Single- and multi-pulse formation of surface structures under static femtosecond irradiation |
| |
Authors: | M. Guillermin F. Garrelie N. Sanner E. Audouard H. Soder |
| |
Affiliation: | a Laboratoire Traitement du Signal et Instrumentation (L.T.S.I.) UMR CNRS 5516, 18 Rue Benoît Lauras - Batiment F, 42000 Saint-Etienne, France b Impulsion SAS, 12 rue Barrouin, 42000 Saint-Etienne, France |
| |
Abstract: | Femtosecond surface structure modifications are investigated under irradiation with laser pulses of 150 fs at 800 nm, on copper and silicon. We report sub-wavelength periodic structures formation (ripples) with a periodicity of 500 nm for both materials. These ripples are perpendicular to the laser polarization and can be obtained with only one pulse. The formation of these ripples corresponds to a fluence threshold of 1 J/cm2 for copper and 0.15 J/cm2 for silicon. We find several morphologies when more pulses are applied: larger ripples parallel to the polarization are formed with a periodicity of 1 μm and degenerate into a worm-like morphology with a higher number of pulses. In addition, walls of deep holes also show sub-wavelength and large ripples. |
| |
Keywords: | Ripples Morphology Laser |
本文献已被 ScienceDirect 等数据库收录! |
|