Abstract New strategies for the fabrication of surface structures using Direct Laser Interference Patterning are presented in this work, aiming to fabricate hierarchical structures with selective wetting properties. Polycarbonate sheets have been structured employing a two-beam interference arrangement using an ultraviolet (263 nm) nanosecond-pulsed laser, creating line- and pillar-like structures with simple and hierarchical geometries. Two different methods for producing hierarchical structures are here provided, both relying on a pixel-wise structuring technique and able to achieve high structure depths. The produced surface patterns are characterized by confocal microscopy, scanning electron microscopy and the influence of the surface topography on the water contact angle is investigated. The correlation between structure geometry and wettability response, in terms of structure height and directionality of the droplet shape is reported.

中文翻译：

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通过使用直接激光干涉图案生成分层结构来控制聚碳酸酯基材的润湿性

摘要 这项工作提出了使用直接激光干涉图案制造表面结构的新策略，旨在制造具有选择性润湿特性的分层结构。聚碳酸酯板采用双光束干涉排列结构，使用紫外（263 nm）纳秒脉冲激光，创建具有简单和分层几何形状的线状和柱状结构。这里提供了两种不同的生成层次结构的方法，都依赖于像素级结构化技术，并且能够实现高结构深度。产生的表面图案通过共聚焦显微镜、扫描电子显微镜进行表征，并研究了表面形貌对水接触角的影响。