Li Ran, Yi Hui, Hu Xiao, Chen Leng, Shi Guangsha, Wang Weimin, Yang Tian
1] University of Michigan - Shanghai Jiao Tong University Joint Institute, National Key Laboratory of Nano/Micro Fabrication Technology, Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China [2].
Sci Rep. 2013 Sep 27;3:2775. doi: 10.1038/srep02775.
Wrinkling has become a well developed bottom-up technique to make artificial surface textures in about the last decade. However, application of the optical properties of long range ordered wrinkles has been limited to one dimensional gratings to date. We report the demonstration of macroscopic optical focusing using wrinkled membranes, in which concentric wrinkle rings on a gold-PDMS bilayer membrane convert collimated illuminations to diffraction-free focused beams. Beam diameters of 300-400 μm have been observed in the visible range, which are dominantly limited by the eccentricity of the current devices. Based upon agreement between theoretical and experimental results on eccentricity effects, we predict a decrease of the beam diameter to no more than around 50 μm, if eccentricity is eliminated.
在过去十年左右的时间里，起皱已成为一种成熟的自下而上的技术，用于制造人造表面纹理。然而，迄今为止，长程有序皱纹的光学特性仅应用于一维光栅。我们报告了使用起皱膜实现宏观光学聚焦的演示，其中金-聚二甲基硅氧烷双层膜上的同心皱纹环将准直照明转换为无衍射聚焦光束。在可见光范围内观察到的光束直径为300-400μm，这主要受当前器件的偏心度限制。基于关于偏心度效应的理论和实验结果之间的一致性，我们预测，如果消除偏心度，光束直径将减小到不超过约50μm。
