Direct fabrication of compound-eye microlens array on curved surfaces by a facile femtosecond laser enhanced wet etching proces
Direct fabrication of compound-eye microlens array on curved surfaces by a facile femtosecond laser enhanced wet etching proces
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DOI：
10.1063/1.4971334
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发表时间：
2016
影响因子：
4
通讯作者：
Xun Hou
中科院分区：
文献类型：
--
作者：
Hao Bian;Yang Wei;Qing Yang;Feng Chen;Fan Zhang;Guangqing Du;Jiale Yong;Xun Hou
We report a direct fabrication of an omnidirectional negative microlens array on a curved substrate by a femtosecond laser enhanced chemical etching process, which is utilized as a molding template for duplicating bioinspired compound eyes. The femtosecond laser treatment of the curved glass substrate employs a common x-y-z stage without rotating the sample surface perpendicular to the laser beam, and uniform, omnidirectional-aligned negative microlenses are generated after a hydrofluoric acid etching. Using the negative microlens array on the concave glass substrate as a molding template, we fabricate an artificial compound eye with 3000 positive microlenses of 95-lm diameter close-packed on a 5-mm polymer hemisphere. Compared to the transferring process, the negative microlenses directly fabricated on the curved mold by our method are distortion-free, and the duplicated artificial eye presents clear and uniform imaging capabilities. This work provides a facile and efficient route to the fabrication of microlenses on any curved substrates without complicated alignment and motion control processes, which has the potential for the development of new microlensbased devices and systems.
