Broader-Band and Flexible Antireflective Films with the Window-like Structures Inspired by the Backside of Butterfly Wing Scales,ACS Applied Materials & Interfaces

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Broader-Band and Flexible Antireflective Films with the Window-like Structures Inspired by the Backside of Butterfly Wing Scales
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-04-19 , DOI: 10.1021/acsami.1c01352
Hanliang Ding ₁ , Delei Liu ₁ , Bo Li ₁ , Wang Ze ₁ , Shichao Niu ₁ , Conghao Xu ₁ , Zhiwu Han ₁ , Luquan Ren ₁

Affiliation

Antireflective performance is critical for most optical devices, such as the efficient solar energy utilization in photovoltaic cells of an aerospace craft and optical displays of scientific precise equipment. Therein, outstanding broad-band antireflection is one of the most crucial properties for antireflection films (ARFs). Unfortunately, it is still a challenging work to realize perfect “broader-band” antireflection because both the low refractive indices materials and time-consuming nanotexturing technologies are required in the fabricating process. Even in this case, a broader-band and flexible ARF with hierarchical structures is successfully developed, which is inspired by butterfly wing scales. First, the butterfly wings surface is treated with acid and stuck on a clean glass. Now, all the scales on the wings will form a strong adhesion with the glass substrate. Then, the wings are removed and the scales are left on the glass slide. Now the backside of scales is facing outward, the backside structures of the scales are coincidentally used as the template. Finally, the structure is replicated and the ARF with a controllable thickness is successfully fabricated by rotating PDMS on the biological template. In this work, the bionic ARFs realize the transmission of nearly 90% and more than 90% in the visible light and infrared region. It enhanced transmission to 13% under standard illumination compared with flat PDMS films of the same thickness. Furthermore, the ARF is flexible enough that it could bend nearly 180° to meet the special antireflection requirements in some extreme conditions. It is expected that this bioinspired AR film could revolutionize the technologies of broader-band antireflective materials and impact numerous applications from glass displays to optoelectronic devices.

中文翻译：

蝴蝶翼秤背面启发的具有窗口状结构的宽频带和柔性减反射膜

抗反射性能对于大多数光学设备至关重要，例如航空航天器光伏电池中高效太阳能利用以及科学精密设备的光学显示器。其中，出色的宽带抗反射性是抗反射膜（ARF）的最关键特性之一。不幸的是，实现完美的“宽带”抗反射仍然是一项艰巨的工作，因为在制造过程中既需要低折射率材料又需要耗时的纳米纹理技术。即使在这种情况下，也成功地开发了具有分层结构的宽带和灵活的ARF，这是受到蝶形翼秤的启发。首先，对蝴蝶的翅膀表面进行酸处理并粘贴在干净的玻璃上。现在，机翼上的所有鳞片都会与玻璃基板形成牢固的附着力。然后，取下机翼，将刻度尺留在载玻片上。现在秤的背面朝外，秤的背面结构巧合地用作模板。最后，通过在生物模板上旋转PDMS，复制了结构并成功制造了厚度可控的ARF。在这项工作中，仿生ARF在可见光和红外区域实现了近90％的透射率，并实现了90％以上的透射率。与相同厚度的平面PDMS膜相比，它在标准照明下的透射率提高了13％。此外，ARF具有足够的柔韧性，可以弯曲近180°，以满足某些极端条件下的特殊防反射要求。

更新日期：2021-04-29

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