Opt Express. 2023 Apr 10;31(8):12802-12818. doi: 10.1364/OE.484426.
Surfaces with strong anti-reflection properties have attracted the wide attention of scientists and engineers due to their great application potential in many fields. Traditional laser blackening techniques are limited by the material and surface profile, which are not able to be applied to film and large-scale surfaces. Inspired by the rainforest, a new design for anti-reflection surface structures was proposed by constructing micro-forests. To evaluate this design, we fabricated micro-forests on an Al alloy slab by laser induced competitive vapor deposition. By controlling the deposition of the laser energy, the surface can be fully covered by forest-like micro-nano structures. The porous and hierarchical micro-forests performed a minimum and average reflectance of 1.47% and 2.41%, respectively, in the range of 400-1200 nm. Different from the traditional laser blackening technique, the micro-scaled structures were formed due to the aggregation of the deposited nanoparticles instead of the laser ablation groove. Therefore, this method would lead to little surface damage and can also be applied to the aluminum film with a thickness of 50 µm. The black aluminum film can be used to produce the large-scale anti-reflection shell. Predictably, this design and the LICVD method are simple and efficient, which can broaden the application of the anti-reflection surface in many fields such as visible-light stealth, precision optical sensors, optoelectronic devices, and aerospace radiation heat transfer device.
具有强抗反射性能的表面由于其在许多领域的巨大应用潜力而引起了科学家和工程师的广泛关注。传统的激光黑化技术受到材料和表面轮廓的限制，无法应用于薄膜和大面积表面。受热带雨林的启发，通过构建微森林，提出了一种新的抗反射表面结构设计。为了评估这种设计，我们通过激光诱导竞争蒸镀在铝合金板上制造了微森林。通过控制激光能量的沉积，可以使表面完全覆盖着森林状的微纳结构。在 400-1200nm 范围内，多孔和分级的微森林的最小和平均反射率分别为 1.47%和 2.41%。与传统的激光黑化技术不同，微尺度结构的形成是由于沉积纳米颗粒的聚集而不是激光烧蚀槽。因此，这种方法几乎不会对表面造成损伤，也可以应用于厚度为 50μm 的铝膜。黑色的铝膜可以用来制作大型的抗反射壳。可以预见，这种设计和 LICVD 方法简单高效，可以拓宽抗反射表面在可见光隐身、精密光学传感器、光电设备和航空航天辐射热传递装置等许多领域的应用。
