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Université Jean Monnet – Saint-Etienne |  |
Journal articles
Sub-100 nm 2D nanopatterning on a large scale by ultrafast laser energy regulation
Abstract : Coupling ultrafast light irradiation to surface nanoreliefs leads to periodic patterns, achieving record processing scales down to tens of nanometers. Driven by near-field interactions, the promising potential of the spontaneous pattern formation relies on the scaling up of one-step manufacturing processes. Here, we report the self-assembly of unconventional arrays of nanocavities of 20 nm diameter with a periodicity down to 60 nm upon ultrafast laser irradiation of a nickel surface. In stark contrast to laser-induced surface ripples, which are stochastic and suffer from a lack of regularity, the 2D patterns present an unprecedented uniformity on extreme scales. The onset of nanocavity arrays ordered in a honeycomb lattice is achieved by overcoming the anisotropic polarization response of the surface by a delayed action of cross-polarized laser pulses. The origin of this self-arrangement is identified as a manifestation of Marangoni convection instability in a nanoscale melt layer, destabilized by the laser-induced rarefaction wave.
Cited literature [53 references]
https://hal-ujm.archives-ouvertes.fr/ujm-02546829
Contributor : Jean-Philippe Colombier Connect in order to contact the contributor
Submitted on : Thursday, July 23, 2020 - 9:34:51 AM
Last modification on : Wednesday, October 21, 2020 - 3:40:52 AM
Contributor : Jean-Philippe Colombier Connect in order to contact the contributor
Submitted on : Thursday, July 23, 2020 - 9:34:51 AM
Last modification on : Wednesday, October 21, 2020 - 3:40:52 AM