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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.
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Submitted on : Thursday, July 23, 2020 - 9:34:51 AM
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Anthony Abou Saleh, Anton Rudenko, Stephanie Reynaud, Florent Pigeon, Florence Garrelie, et al.. Sub-100 nm 2D nanopatterning on a large scale by ultrafast laser energy regulation. Nanoscale, 2020, 12, pp.6609-6616. ⟨10.1039/c9nr09625f⟩. ⟨ujm-02546829⟩



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