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<p>In this work, we have developed a parametric model using laser processing parameters to analyze the performance difference in hydrophobic metal surfaces fabricated by an ultrafast laser. The model is developed for 1D line-scan and 2D raster-scan operations, establishing the relationship between total fluence received at any position on the surface and processing parameters including average laser power, focal spot size, scan speed and hatch distance. The model presents performance metrics which are referred to as fluence figure of merit (FoM<sub>F</sub>) and thermal figure of merit (FoM<sub>T</sub>). These metrics are used to interpret the water contact-angle (CA) measurements performed on various laser-fabricated hydrophobic surfaces. It is found that the purely geometric metric FoM<sub>F</sub> cannot explain different CA data, and the inclusion of thermal effects in FoM<sub>T</sub> is needed. It is also found that high CA can be obtained with either small FoM<sub>T</sub> with strong heat accumulation or large FoM<sub>T</sub> indictive of low heating and high laser fluence. This model is useful in providing a suitable combination of laser parameters to optimize laser processing for specific needs such as patterning, drilling and polishing.</p>

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A Parametric Model to Optimize Ultrafast Laser Fabrication of Hydrophobic Metal Surfaces

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • Punith Chikkahalli Lokesh,
  • Gabryella Baldaci,
  • Xinpeng Du,
  • Fang Xue,
  • Xiaoming Yu

摘要

In this work, we have developed a parametric model using laser processing parameters to analyze the performance difference in hydrophobic metal surfaces fabricated by an ultrafast laser. The model is developed for 1D line-scan and 2D raster-scan operations, establishing the relationship between total fluence received at any position on the surface and processing parameters including average laser power, focal spot size, scan speed and hatch distance. The model presents performance metrics which are referred to as fluence figure of merit (FoMF) and thermal figure of merit (FoMT). These metrics are used to interpret the water contact-angle (CA) measurements performed on various laser-fabricated hydrophobic surfaces. It is found that the purely geometric metric FoMF cannot explain different CA data, and the inclusion of thermal effects in FoMT is needed. It is also found that high CA can be obtained with either small FoMT with strong heat accumulation or large FoMT indictive of low heating and high laser fluence. This model is useful in providing a suitable combination of laser parameters to optimize laser processing for specific needs such as patterning, drilling and polishing.