Integration of Great Water Repellence and Imaging Performance on a Superhydrophobic PDMS Microlens Array by Femtosecond Laser Microfabrication
Integration of Great Water Repellence and Imaging Performance on a Superhydrophobic PDMS Microlens Array by Femtosecond Laser Microfabrication
复制标题
通过飞秒激光微加工实现超疏水 PDMS 微透镜阵列的优异防水性和成像性能
DOI：
10.1002/adem.201800994
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发表时间：
2019-03-01
影响因子：
3.6
通讯作者：
Hou, Xun
中科院分区：
文献类型：
--
作者：
Li, Minjing;Yang, Qing;Hou, Xun
微透镜阵列(MLA)作为重要的光学器件，容易受到空气中水滴或类粉尘的污染。赋予人工MLA抗水和自洁能力仍然是一个巨大的挑战。报道了一种利用飞秒激光湿法刻蚀和飞秒激光直写相结合的方法制备超疏水聚二甲基硅氧烷(PDMS)多层膜的新方法。得到的表面由凸起的MLA和周围粗糙的微/纳米级分层结构组成。所制备的MLA表面的水滴的接触角为162度，当衬底轻微倾斜0.5度时，水滴可以很容易地滚动离开。除了优异的成像性能外，这种超低粘附性和超高疏水性还赋予了所制备的MLA优异的抗水能力以及相对于普通MLA的自洁功能。作者认为，防水自清洁MLA在太阳能电池、医用内窥镜和其他经常在潮湿环境或户外使用的光学系统中将有许多重要的应用。
Microlens arrays (MLAs), as the important optical devices, are easily polluted by the water droplets or power-like-contaminates in the air. Endowing the artificial MLAs with anti-water and self-cleaning abilities remains great challenge. In this paper, the authors report a novel method for fabricating superhydrophobic polydimethylsiloxane (PDMS) MLAs by the combination of femtosecond laser wet etching and femtosecond laser direct writing methods. The resultant surface is composed of a convex MLA and the surrounding rough micro/nanoscale hierarchical structures. Water droplet on the surface of the as-prepared MLA shows a contact angle of 162 degrees and can easily roll away when the substrate is slightly tilted 0.5 degrees. In addition to their excellent imaging performance, such ultralow adhesive and ultrahigh superhydrophobicity also endows the as-prepared MLA with excellent anti-water ability as well as the self-cleaning function relative to the normal MLA. The authors believe that the anti-water and self-cleaning MLAs will potentially have many important applications in solar cells, medical endoscopes, and other optical systems that are often used in the humid environment or outdoors.