Physics – Condensed Matter – Materials Science
Scientific paper
2008-11-15
Journal of Applied Physics 104 (2008) 093504
Physics
Condensed Matter
Materials Science
Scientific paper
10.1063/1.3000457
We report on picosecond UV-laser processing of hexagonal boron nitride (hBN) at moderately high pressures above 500 bar. The main effect is specific to the ambient gas and laser pulse duration in the ablation regime: when samples are irradiated by 5 ps or 0.45 ps laser pulses in nitrogen gas environment, multiple nucleation of a new crystalline product - BN nanorods - takes place. This process is triggered on structural defects, which number density strongly decreases upon recrystallization. Non-linear photon absorption by adsorbed nitrogen molecules is suggested to mediate the nucleation-growth. High pressure is responsible for the confinement and strong backscattering of ablation products. A strong surface structuring also appears at longer 150-ps laser irradiation in similar experimental conditions. However, the transformed product in this case is amorphous strongly contaminated by boron suboxides BxOy.
Anglos Demetrios
Fotakis Costa
Kanaev Andrei
Marine Wladimir
Michel Jean Pierre
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