Picosecond laser structuration under high pressures: observation of boron nitride nanorods - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Applied Physics Année : 2008

Picosecond laser structuration under high pressures: observation of boron nitride nanorods

Résumé

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.
Fichier principal
Vignette du fichier
art_hBN_ps_structuration_full.pdf (1.37 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00338826 , version 1 (14-11-2008)

Identifiants

Citer

Luc Museur, Jean Pierre Petitet, Jean Pierre Michel, Wladimir Marine, Demetrios Anglos, et al.. Picosecond laser structuration under high pressures: observation of boron nitride nanorods. Journal of Applied Physics, 2008, 104, pp.093504. ⟨10.1063/1.3000457⟩. ⟨hal-00338826⟩
115 Consultations
87 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More