Large-Beam Picosecond Interference Patterning of Metallic Substrates.

Area of Science:

• Materials Science
• Laser Physics
• Surface Engineering

Background:

• Efficient fabrication of micro/nanostructures is crucial for advanced material properties.
• Laser-based interference patterning offers precise control over surface morphology.

Purpose of the Study:

• To introduce an efficient method for large-beam interference patterning using a high-energy pulsed laser.
• To investigate the fabrication of micro/nanostructures on various metals and analyze their surface properties.

Main Methods:

• Utilized a high-energy pulsed 1.7 ps HiLASE Perla laser system for two-beam interference patterning.
• Employed large-beam interference patterning to enlarge the interference area and increase processing throughput.
• Fabricated micro/nanostructures on stainless steel, invar, and tungsten.

Main Results:

• Achieved efficient fabrication of micro and sub-micron sized features with a maximum speed of 206 cm²/min.
• Created diverse surface micro/nanostructures and their combinations.
• Demonstrated superhydrophobic behavior on treated surfaces with high contact angles (164° for stainless steel, 156° for invar, 150° for tungsten).

Conclusions:

• The developed large-beam interference patterning method is effective for rapid fabrication of complex surface structures.
• The hierarchical structures exhibit significant superhydrophobic properties, indicating potential applications in surface engineering.