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Creation of micro/nano surface structures on silver using collinear double femtosecond laser pulses with different pulse separation

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Abstract

Self-organized mound-like micro/nanoscale structures are reported for the first time on silver using a dual-pulse femtosecond laser surface processing technique. The dual-pulse laser processing technique reported in this paper uses femtosecond laser pulse pairs with a controlled temporal delay between the leading and trailing pulses. Using dual pulses at higher fluence values, mound-like micro/nanostructures have been created on silver samples for the first time. Formation of the self-organized microstructures is shown to be dependent on the time delay between the leading and trailing pulses. Mound-like microstructures do not develop on silver for overlapped pulses or using single-pulse femtosecond laser surface processing for the parameter space studied. Subsurface microstructure characterization of a single mound-like surface structure is analyzed by cross-sectional analysis using focused ion beam milling followed by scanning electron microscopy and energy dispersive X-ray spectroscopy.

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Acknowledgements

This work was supported by the Office of Naval Research (ONR) Contract number FA4600-12-D-9000-0057, NASA Johnson Space Center Contract number NNJ17HH85P and the NASA Space Grant Consortium FY 2015-FY 2017 Grant # NNX15AI09H.

The research was performed in part in the Nebraska Nanoscale Facility: National Nanotechnology Coordinated Infrastructure and the Nebraska Center for Materials and Nanoscience, which are supported by the National Science Foundation under Award ECCS: 1542182, and the Nebraska Research Initiative.

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Correspondence to Nicholas Roth.

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Roth, N., Zuhlke, C., Peng, E. et al. Creation of micro/nano surface structures on silver using collinear double femtosecond laser pulses with different pulse separation. Multiscale and Multidiscip. Model. Exp. and Des. 1, 145–153 (2018). https://doi.org/10.1007/s41939-018-0011-2

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  • DOI: https://doi.org/10.1007/s41939-018-0011-2

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