Patternable fabrication of hyper-hierarchical metal surface structures for ultrabroadband antireflection and self-cleaning
Patternable fabrication of hyper-hierarchical metal surface structures for ultrabroadband antireflection and self-cleaning
复制标题
用于超宽带抗反射和自清洁的超分层金属表面结构的可图案化制造
DOI：
10.1016/j.apsusc.2018.07.017
复制
发表时间：
2018-11-01
影响因子：
6.7
通讯作者：
Zhong, Minlin
中科院分区：
文献类型：
--
作者：
Fan, Peixun;Bai, Benfeng;Zhong, Minlin
降低光反射的能力对于各种关键应用至关重要。实际应用中的抗反射表面需要满足在宽带有效性、灵活制造和性能稳定性方面的综合要求。在此，我们提出并通过实验证明了一种在铜等金属表面形成的高度无序的超分级微纳结构，这种结构在从紫外到远红外的超宽带光谱上具有显著的吸光能力。在400 - 800纳米、200 - 2000纳米和2.5 - 25微米的波长范围内，分别实现了约2.4%、约5.5%和约6%的平均半球反射率，在0.2 - 25微米范围内达到了约94%的平均吸收率。在25 - 300微米的长波长范围内，相对于原始铜表面，镜面反射率也大幅降低。这种超宽带抗反射结构是通过一种非接触、无掩模、一步飞秒激光直写方法制造的，使其能够灵活地制备成所需的图案。在苛刻的老化测试过程中，这种超分级结构及其超宽带抗反射性能保持稳健和稳定。除了抗反射性能外，这种超分级结构还表现出优异的自清洁性能。超宽带有效性、图案化灵活性、结构稳健性以及自清洁方面的所有这些优势，使其在实际应用中具有良好的前景。
The capabilities to reduce light reflection have essential importance for various critical applications. Realistic antireflection surfaces are required to satisfy the comprehensive demands in broadband effectiveness, flexible fabrication, and performance stability. Here, we propose and experimentally demonstrate a type of highly disordered hyper-hierarchical micro-nano structures formed on the surfaces of metals such as Cu, which have the significant capability in absorbing light over the ultrabroadband spectrum from ultraviolet to far-infrared. Average hemispherical reflectance of similar to 2.4%, similar to 5.5%, and similar to 6% is achieved in the wavelength ranges of 400-800 nm, 200-2000 nm, and 2.5-25 mu m respectively, reaching an average absorptance of similar to 94% within 0.2-25 mu m The specular reflectance in the long wavelength range of 25-300 mu m is also dramatically reduced with respect to the original Cu surface. Such an ultrabroadband antireflection structure is fabricated by a non-contact, maskless, one-step femtosecond laser direct writing approach, making it flexible to be prepared in desired patterns. The hyper-hierarchical structure and its ultrabroadband antireflection property keep robust and stable during harsh aging tests. In addition to the antireflection property, the hyper-hierarchical structure also exhibits excellent self-cleaning performance. All these advantages in ultrabroadband effectiveness, patterning flexibility, structural robustness, as well as self-cleaning, make it promising for practical applications.