Gallego Diego, Ayerdi Isabel, Pan Aldara, Olaizola Santiago M, Rodriguez Ainara
Ceit-Basque Research and Technology Alliance (BRTA), Manuel Lardizabal 15, 20018, Donostia/San Sebastian, Spain.
Universidad de Navarra, Tecnun, Manuel Lardizabal 13, 20018, Donostia/San Sebastian, Spain.
Sci Rep. 2025 May 3;15(1):15483. doi: 10.1038/s41598-025-00185-1.
Laser induced periodic surface structures (LIPSS) are directional and periodic nanostructures generated in most materials when irradiated with linear polarized laser beams under certain irradiation conditions. LIPSS present a wide range of well-known properties and applications, but their implementation on the optical field is restricted because of their low regularity in comparison to microstructures fabricated by other methods. Surface roughness has an impact on LIPSS regularity, as it can promote their generation acting as a seed or influence their orientation in favor of the roughness direction. During this study, the influence of the surface roughness and its orientation on the LIPSS regularity has been explored by means of DLOA (dispersion of the LIPSS orientation angle), for stainless steel with arithmetic mean height (Sa) parameter ranging from a few nanometers to one micrometer. The experimental results have proven that the magnitude and a preferred direction of substrate roughness affect the coherence and orientation of the LIPSS.
激光诱导周期性表面结构（LIPSS）是在特定辐照条件下，用线偏振激光束辐照大多数材料时产生的定向且周期性的纳米结构。LIPSS具有广泛的众所周知的特性和应用，但由于与通过其他方法制造的微结构相比其规则性较低，它们在光场中的应用受到限制。表面粗糙度会影响LIPSS的规则性，因为它可以作为种子促进其生成，或者影响其取向使其有利于粗糙度方向。在本研究中，通过LIPSS取向角的色散（DLOA），研究了表面粗糙度及其取向对算术平均高度（Sa）参数范围从几纳米到一微米的不锈钢的LIPSS规则性的影响。实验结果证明，基底粗糙度的大小和优选方向会影响LIPSS的相干性和取向。
