Creation of Micro/Nano Surface Structures on Silver Using Collinear Double Femtosecond Laser pulses with Different Pulse Separation

Authors

• Nicholas Roth, University of Nebraska-LincolnFollow
• Craig Zuhlke, University of Nebraska-LincolnFollow
• Edwin Peng, University of Nebraska-LincolnFollow
• Scott Hansen, United States National Aeronautics and Space Administration, Johnson Space Center
• Jeffrey E. Shield, University of Nebraska-LincolnFollow
• Dennis Alexander, University of Nebraska-LincolnFollow

Date of this Version

2018

Document Type

Article

Citation

Multiscale and Multidisciplinary Modeling, Experiments and Design (2018) 1: 145–153

doi: 10.1007/s41939-018-0011-2

Comments

United States government work

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.