The Role of Crystalline Orientation in the Formation of Surface Patterns on Solids Irradiated with Femtosecond Laser Double Pulses
1
Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology (FORTH), N. Plastira 100, Vassilika Vouton, 70013 Heraklion, Crete, Greece
2
Laboratoire de Physique des Lasers, CNRS UMR 7538, Université Sorbonne Paris NORD, 93430 Villetaneuse, France
3
Laboratoire des Sciences des Procédés et des Matériaux, CNRS, Université Sorbonne Paris NORD, 93430 Villetaneuse, France
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(24), 8811; https://doi.org/10.3390/app10248811
Received: 12 November 2020
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Revised: 2 December 2020
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Accepted: 7 December 2020
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Published: 9 December 2020
(This article belongs to the Special Issue Multiscale Modelling of Laser-Induced Phenomena on Solids)
A theoretical investigation of the underlying ultrafast processes upon irradiation of rutile TiO2 of (001) and (100) surface orientation with femtosecond (fs) double pulsed lasers was performed in ablation conditions, for which, apart from mass removal, phase transformation and surface modification of the heated solid were induced. A parametric study was followed to correlate the transient carrier density and the produced lattice temperature with the laser fluence, pulse separation and the induced damage. The simulations showed that both temporal separation and crystal orientation influence the surface pattern, while both the carrier density and temperature drop gradually to a minimum value at temporal separation equal to twice the pulse separation that remain constant at long delays. Carrier dynamics, interference of the laser beam with the excited surface waves, thermal response and fluid transport at various pulse delays explained the formation of either subwavelength or suprawavelength structures. The significant role of the crystalline anisotropy is illustrated through the presentation of representative experimental results correlated with the theoretical predictions.
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Keywords:
multiscale modelling of laser-matter interaction; ultrashort laser pulses; phase transitions; surface patterning; carrier dynamics; crystal orientation; double pulse irradiation of solids; heat transfer; surface plasmon excitation
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MDPI and ACS Style
Tsibidis, G.D.; Museur, L.; Kanaev, A. The Role of Crystalline Orientation in the Formation of Surface Patterns on Solids Irradiated with Femtosecond Laser Double Pulses. Appl. Sci. 2020, 10, 8811. https://doi.org/10.3390/app10248811
AMA Style
Tsibidis GD, Museur L, Kanaev A. The Role of Crystalline Orientation in the Formation of Surface Patterns on Solids Irradiated with Femtosecond Laser Double Pulses. Applied Sciences. 2020; 10(24):8811. https://doi.org/10.3390/app10248811
Chicago/Turabian StyleTsibidis, George D., Luc Museur, and Andrei Kanaev. 2020. "The Role of Crystalline Orientation in the Formation of Surface Patterns on Solids Irradiated with Femtosecond Laser Double Pulses" Applied Sciences 10, no. 24: 8811. https://doi.org/10.3390/app10248811
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