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- W2896935140 abstract "Abstract The fabrication of sub-micron and nanopatterns at large surface areas by lasers is still a challenge, but the use of laser-induced, self-organized processes provides a promising approach. Here, the guided formation of nanodroplets ordered in two directions during irradiation of 15 nm thick molybdenum (Mo) film on Al2O3 (1–102) substrate with a fibre laser having a wavelength of 1064 nm and selectable pulse duration from 5 to 600 ns is demonstrated. The two-step process comprises laser-induced ripple formation and remelting of the ripples for nanodroplet generation. The ripples with period of ∼1.1 µm are oriented perpendicularly to the laser polarization. The ripples are fabricated by irradiation with 46 laser pulses with a duration between 25 to 100 ns and fluences of 0.3 to 1.3 J/cm², respectively. After a subsequent laser irradiation with 10 pulses at fluences above 1 J/cm² and a pulse duration of 100 ns, two kinds of Mo droplets are observed: (i) large, periodically ordered droplets with a diameter of ∼360 nm and a distance along and orthogonal to the laser-generated ripples of about 1 µm and 1.1 µm, respectively, in addition to (ii) small, less-ordered droplets with a size of about 120 nm localized in the former ripple valleys." @default.
- W2896935140 created "2018-10-26" @default.
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- W2896935140 date "2019-02-01" @default.
- W2896935140 modified "2023-09-27" @default.
- W2896935140 title "Guided self-organization of nanodroplets induced by nanosecond IR laser radiation of molybdenum films on sapphire" @default.
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- W2896935140 doi "https://doi.org/10.1016/j.optlaseng.2018.10.005" @default.
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