Micropattern-assisted absorption enhancement and wettability surface on ZnO via single femtosecond laser beam tailoring
Micropattern-assisted absorption enhancement and wettability surface on ZnO via single femtosecond laser beam tailoring
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DOI：
10.1016/j.optlastec.2022.107979
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Qisong Li;H. Shi;C. Luo;Z. Fan;Huoyu Wang;Long Zhang;Yi Liu
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文献类型：
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作者：
Qisong Li;H. Shi;C. Luo;Z. Fan;Huoyu Wang;Long Zhang;Yi Liu
在这里，我们报道了利用单束飞秒激光(400 nm，35 fS，kHz)在晶体氧化锌上进行的微图形辅助吸收增强。这种由飞秒激光一步裁剪而成的二维微图形，与传统的激光诱导周期性表面结构形成了鲜明的对比。通过重叠扫描的方法可以实现二维微图形的大面积制备，显示出潜在的实际应用前景。我们发现吸收呈增加趋势，最大值在紫外区为90-99%，在可见光区为75-80%。此外，理论结果还表明，从紫外光到近红外波段的二维结构上都存在很强的电场增强现象。我们还确定了这些微图案结构的液体接触角，这些微图案结构表现出依赖于激光能量的可控润湿性特征。
Herein, we report significant micropattern-assisted absorption enhancement on crystalline ZnO fabricated by a single femtosecond laser beam (400 nm, 35 fs, kHz). This two-dimensional micropattern, which is achieved by one-step femtosecond laser tailoring, sharply contrasts the traditional laser-induced periodic surface structure. The large-area preparation of two-dimensional micropatterns can be achieved via an overlapped scanning method, showing potential practical applications. We find that the absorption shows an increasing trend, with maximum values of 90–99% in the ultraviolet spectral regions and 75–80% in the visible spectral regions. Additionally, theoretical results demonstrate that a strong electric field enhancement phenomenon exists on the two-dimensional structure from the ultraviolet to near-infrared wavelengths. We also determine the liquid contact angle of these micropattern structures, which exhibit controlled wettability characteristics that are dependent on laser energy.