Impact of molten pool dynamics on resultant surface structures during direct laser interference patterningThursday (25.06.2020) 11:50 - 12:10 Room 2
Direct laser interference patterning (DLIP) is a well-known technique for patterning material surfaces for the production of well-defined sub-micro-sized periodical patterns at industrially acceptable fabrication speeds. DLIP is mainly used to introduce new or improve existing functionalities to the material surface. Therefore, the capability to form various types of structures is vital for the technology to be used in more fields, like automotive, medicine, aerospace industry, etc., where functionalities such as superhydrophobicity, reduced friction and antibacterial behavior among others are in high demand. In order to extend the variety of structures that can be achieved with DLIP, further strategies have been developed that implement the control of interfering beams polarisation or phase. However, this additional elements increment the complexity of the system, which is highly undesirable for industrial applications.
In this paper, we demonstrate alternative techniques for producing different structure shapes using a standard four-beam DLIP setup. It was found that a simple variation of processing parameters leads to the formation of new shapes on the surface of stainless steel sample. The mechanism responsible for such behavior is based on molten material dynamics.
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