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Proceedings Paper

1-D and 2-D surface structuring of steel by bursts of femtosecond laser pulses
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Paper Abstract

In this work, we report on the fabrication of laser induced periodic surface structures (LIPSS) on stainless steel, using bursts of 200 fs sub-pulses at a wavelength of 1030 nm. A cascade of birefringent crystals was used to generate the bursts with tunable number of sub-pulses and intra-burst delays varying between 1.5 ps and 24 ps. Being such a delay shorter than the typical electron-lattice relaxation time in metals, the sub-pulses impinge on the sample surface when the material is still in a transient state after excitation from the first sub-pulse, thus allowing peculiar structures to be generated depending on the burst features. We obtained 1-D and 2-D periodic surface structures and investigated the influence of number of sub-pulses and polarization on their morphology. In particular, when bursts composed by all-aligned linearly polarized sub-pulses were used, 1-D LIPSS were obtained with different periodicity and depths depending on the number of sub-pulses. Bursts with crossed linear polarization or circular polarization sub-pulses produced 2-D LIPSS with morphology varying from triangular structures arranged in hexagonal lattice to pillar-like ordered or disordered structures depending on the bursts features. In most cases these structures exhibit a superhydrophobic behavior, as assessed by static contact angle measurements, which is achieved after a time of exposition to laboratory air. By XPS analysis we investigated the chemical variations occurring on the surfaces over this time.

Paper Details

Date Published: 4 March 2019
PDF: 8 pages
Proc. SPIE 10906, Laser-based Micro- and Nanoprocessing XIII, 109060O (4 March 2019); doi: 10.1117/12.2511112
Show Author Affiliations
Giuseppe Giannuzzi, Univ. degli Studi di Bari Aldo Moro (Italy)
CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Caterina Gaudiuso, Univ. degli Studi di Bari Aldo Moro (Italy)
CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Marco Cinquino, Univ. degli Studi di Bari Aldo Moro (Italy)
Rosa Di Mundo, Politecnico di Bari (Italy)
Luciana Mirenghi, ENEA (Italy)
Cinzia Di Franco, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Gaetano Scamarcio, Univ. degli Studi di Bari Aldo Moro (Italy)
CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Pietro Mario Lugarà, Univ. degli Studi di Bari Aldo Moro (Italy)
CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Antonio Ancona, CNR-Istituto di Fotonica e Nanotecnologie (Italy)


Published in SPIE Proceedings Vol. 10906:
Laser-based Micro- and Nanoprocessing XIII
Udo Klotzbach; Akira Watanabe; Rainer Kling, Editor(s)

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