Influence of Polishing Orientation on the Generation of LIPSS on Stainless Steel

Abstract

This paper applies a combined precision stage to fabricate micro-structures by two-photon polymerization (TPP). The combined stage consists of PZT and stepper-motor stages to achieve precision positioning in long displacements. First, we derive the models of the stages by identification experiments. Second, we apply robust loop-shaping techniques to improve the positioning performance of the stages. Third, we integrate the stages and develop a multi-loop control structure to provide long-stroke and high precision. In addition, we propose coordinate transformation and anti-locking functions for further improvement of the system performance. Last, we apply the combined stage to a TPP system for fabricating micro-structures, and define performance indexes based on image processing and optical qualities. The obtained performance criteria can be used to adjust controller design to improve precision manufacturing.

Artificial Seeds‐Regulated Femtosecond Laser Plasmonic Nanopatterning

“…When processing polished stainless steel by ultrashort lasers, it has been found that the mechanical scratches can obviously improve the regularity and change the orientation of periodic nanostructures. [46][47][48] Such scratches behave as artificial seeds to guide the formation of self-organized nanostructures. Afterward, the utilization of more complicated micro/nanostructures to influence the LIPSS has been investigated, including metallic and semiconductor nanoparticles, [49] gold micro-flakes, [50,51] and step edges.…”

Triangular laser-induced submicron textures for functionalising stainless steel surfaces

“…High repetition rates combined with high scanning speed, in the order of MHz and m/s respectively, has also been shown to enable area processing with sufficient pulse fluence and pulse overlap to generate uniform LIPSS in one pass; the uniformity being then obtained by optimising the distance between scanned lines [29]. However, potential local non-uniformities of LIPSS are known to occur as a result of preceding polishing step [28,31], grain boundaries [32] and surface defects [28].…”

Surface Plasmon Polariton Triggered Generation of 1D-Low Spatial Frequency LIPSS on Fused Silica

“…While the majority of scientific studies of LSFL on dielectric materials are based on punctual structures [12,15,27,28], i.e., LSFL are generated on a single spot only, for industrial applications, the generation of one-and two-dimensional LSFL is mandatory by scanning the laser. For metals [1][2][3][4]14,29,30] and semiconductors [5,[31][32][33], this has been shown in several publications because of the convenience in generating LSFL on these materials with free charged carriers ( < 0). For dielectric materials, e.g., fused silica, the authors recently have shown the transfer from punctual laser irradiation into the dynamic range, i.e., moving the laser spot over the sample [16].…”

“…They typically arise on solid materials upon polarized laser irradiation with the fluence being near the materials' ablation threshold [1,12,13]. LIPSS have been shown on all material classes such as conductors [1,2,14], semiconductors [5,11,12] and dielectrics [12,15,16]. Please note, due to the availability of free charge carriers, texturing conductors and semiconductors with LIPSS is significantly simpler than structuring dielectrics.…”