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arXiv 2505.02477physics.opticscond-mat.mtrl-sciphysics.app-ph
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利用紫外飞秒脉冲在聚碳酸酯上制备高度均匀的激光诱导周期性结构

Fabrication of highly uniform laser-induced periodic structures on polycarbonate via UV femtosecond pulses

Matina Vlahou, Nektaria Protopapa, Stella Maragkaki, George D. Tsibidis, Emmanuel Stratakis

备注：
To appear in Optics and Laser Technology
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AI总结：

本文系统研究258 nm飞秒激光在聚碳酸酯上制备LIPSS，揭示线偏振低激发可提高均匀性、圆偏振形成纳米球状微结构，并结合Sipe理论和超快动力学模型解释机理，同时表征了诱导结构的润湿性与光学性能变化。

摘要：

本工作聚焦于利用258 nm飞秒激光脉冲在块体聚碳酸酯（PC）上制备高度均匀的激光诱导周期性表面结构（LIPSS）。我们采用系统方法研究了不同激光参数（如能量密度、有效脉冲数、能量剂量和偏振）对所生成LIPSS特征的影响。实验结果表明，线偏振光束产生的LIPSS周期与激光波长相当。此外，观察到LIPSS的取向取决于激发水平，或平行或垂直于激光偏振方向。尽管聚碳酸酯在258 nm处具有相当高的吸收和较大的消光系数（约10⁻²），这些特征仍与在电介质上形成的LIPSS相似。利用Sipe理论解释了不同激发水平下图案的取向和特征，同时通过应用描述聚合物中超快动力学的理论物理模型，对激发和诱导载流子密度进行了量化。进一步观察表明，线偏振条件下的低激发水平可提高LIPSS的均匀性，而用圆偏振光束辐照PC靶材则会导致形成微米尺度形貌，其上装饰有突出的纳米球状结构，其尺寸随激光条件而变化。对诱导形貌对其润湿性和光学特性影响的详细分析表明，亲水性随时间稳定增强，而光学吸收率仅适度增加。关于PC上诱导形貌的形态特征和性能的结果，有望支持未来在聚合物材料上制备图案化表面以用于潜在应用的工作。

英文摘要：

In this work, we focus on the fabrication of highly uniform laser-induced periodic surface structures (LIPSS) on bulk polycarbonate (PC) using 258 nm femtosecond laser pulses. A systematic approach was pursued to investigate the influence of various laser parameters such as fluence, effective number of pulses, energy dose and polarisation on the features of the generated LIPSS. Experimental results showed that linearly polarized beams produce LIPSS with period comparable to the laser wavelength. Moreover, it was observed that the orientation of LIPSS is either parallel or perpendicular to the laser polarization, depending on the excitation level. These features are similar to the LIPSS formed on dielectrics, despite the considerably higher absorption and larger extinction coefficient (~10-2) of polycarbonate at 258 nm. The orientation and features of the patterns at different excitation levels are explained using Sipe's theory, while the excitation and induced carrier densities were quantified through the application of a theoretical physical model that describes ultrafast dynamics in polymers. Furthermore, observations revealed that low excitation levels with linearly polarized enhance the uniformity of LIPSS, whereas irradiating PC targets with circularly polarized beams leads to the formation of microscale topographies decorated with protruding nanosphered-like structures, with their size varying based on the laser conditions. A detailed analysis of the impact of the induced topographies on their wetting and optical properties demonstrated a steady increase in hydrophilicity over time, in contrast to a modest increase in optical absorbance. The results regarding the morphological features and properties of the induced topographies on PC are anticipated to support future efforts in creating patterned surfaces on polymeric materials for potential applications.

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