| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Siegel, Jan
Consejo Superior de Investigaciones Científicas
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2024Amorphization and Ablation of Crystalline Silicon Using Ultrafast Lasers: Dependencies on the Pulse Duration and Irradiation Wavelengthcitations
- 2024Amorphization and Ablation of Crystalline Silicon Using Ultrafast Lasers: Dependencies on the Pulse Duration and Irradiation Wavelengthcitations
- 2024Optoplasmonic tuneable response by femtosecond laser irradiation of glass with deep-implanted gold nanoparticles
- 2024Optoplasmonic tuneable response by femtosecond laser irradiation of glass with deep-implanted gold nanoparticles
- 2022Propagation dynamics of the solid–liquid interface in Ge upon ns and fs laser irradiationcitations
- 2022Mechanisms driving self-organization phenomena in random plasmonic metasurfaces under multipulse femtosecond laser exposure: a multitime scale studycitations
- 2021Anisotropic Resistivity Surfaces Produced in ITO Films by Laser‐Induced Nanoscale Self‐organizationcitations
- 2021Deep surface amorphization in silicon induced by spectrally-tuned ultrashort laser pulses
- 2020The Role of the Laser-Induced Oxide Layer in the Formation of Laser-Induced Periodic Surface Structurescitations
- 2019Surface Plasmon Polaritons on Rough Metal Surfaces: Role in the Formation of Laser-Induced Periodic Surface Structurescitations
- 2018Biomimetic surface structures in steel fabricated with femtosecond laser pulses: influence of laser rescanning on morphology and wettabilitycitations
- 2018Author Correction: Coherent scatter-controlled phase-change grating structures in silicon using femtosecond laser pulsescitations
- 2018Controlling the Wettability of Steel Surfaces Processed with Femtosecond Laser Pulsescitations
- 2018Optical spectroscopy study of nano- and microstructures fabricated by femtosecond laser pulses on ZnO based systemscitations
- 2017Coherent scatter-controlled phase-change grating structures in silicon using femtosecond laser pulsescitations
- 2014Origin of the refractive index modification of femtosecond laser processed doped phosphate glasscitations
- 2013Nanostructuring thin polymer films with optical near fieldscitations
- 2011Dynamics of laser-induced phase switching in GeTe filmscitations
- 2009Hot-wire chemical vapor growth and characterization of crystalline GeTe filmscitations
- 2008Amorphization dynamics of Ge2 Sb2 Te5 films upon nano- and femtosecond laser pulse irradiationcitations
- 2008Time- and space-resolved dynamics of ablation and optical breakdown induced by femtosecond laser pulses in indium phosphidecitations
- 2006Time- and space-resolved dynamics of melting, ablation, and solidification phenomena induced by femtosecond laser pulses in germaniumcitations
- 2005Imaging the dissociation processs of O2 background gas during pulsed laser ablation of LiNbO3citations
- 2004Rewritable phase-change optical recording in Ge₂Sb₂Te₅ films induced by picosecond laser pulsescitations
Places of action
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article
Propagation dynamics of the solid–liquid interface in Ge upon ns and fs laser irradiation
Abstract
<jats:title>Abstract</jats:title><jats:p>Monitoring the laser-induced melting and solidification dynamics of Ge upon laser irradiation is an enormous challenge due to the short penetration depth of its liquid phase. In this work, real-time pump-probe experiments in combination with finite element calculations have been employed to investigate the melting and solidification dynamics of germanium upon ns and fs laser pulse irradiation (<jats:italic>λ</jats:italic> = 800 nm). Excellent agreement between experiments and simulations allowed us to indirectly determine additional time- and depth-dependent information about the transformation dynamics of germanium, including the thickness evolution of the molten layer, as well as its melting and solidification velocities for the two pulse durations for different fluences. Our results reveal considerable differences in the maximum thickness of the molten Ge superficial layers at sub-ablative fluences for ns and fs pulses, respectively. Maximum melt-in velocities of 39 m s<jats:sup>−1</jats:sup> were obtained for ns pulses at high fluences, compared to non-thermal melting of a thin layer within 300 fs for fs pulses already at moderate fluences. Maximum solidification velocities were found to be 16 m s<jats:sup>−1</jats:sup> for ns pulses, and up to 55 m s<jats:sup>−1</jats:sup> for fs pulses. Weak signs of amorphization were observed for fs excitation, suggesting that the lower limit of solidification velocities for a complete amorphization is above 55 m s<jats:sup>−1</jats:sup>. In addition, we show high precision measurements of the melt-in velocities over the first 20 nm by means of fs microscopy with sub-ps temporal resolution. Here, differences of the melt-in process of several orders of magnitude were observed, ranging from virtually instantaneous melting within less than 2 ps even for a moderate peak fluence up to 200 ps for fluences close to the melting threshold.</jats:p>