Advanced Functional Materials
Advanced Functional Materials
5 years ago

Multifurcate Assembly of Slanted Micropillars Fabricated by Superposition of Optical Vortices and Application in High-Efficiency Trapping Microparticles

Multifurcate Assembly of Slanted Micropillars Fabricated by Superposition of Optical Vortices and Application in High-Efficiency Trapping Microparticles
Zhongyu Wang, Jiawen Li, Jincheng Ni, Chenchu Zhang, Shengyun Ji, Ziqin Li, Yanlei Hu, Dong Wu, Bing Xu, Zhaoxin Lao, Jiaru Chu
Self-assembly induced by capillary force is abundant in nature and has been widely used in fabrication as a bottom-up method. Here a rapid and flexible method for achieving an even number of furcate slanted micropillars by single-exposure under a spatial phase modulated laser beam is reported, which is produced by designing a superimposed hologram with opposite topological charges to split the incident beam into several equal-weighting sectors. These furcate micropillars with intentional spatial arrangement can be directed to capillary-assisted self-assembly process for generating designable hierarchical functional arrays. Due to the slanted characteristic of micropillars (8°–13°), the assembled arrays are very stable and can be used as an effective tool for trapping SiO2 particles to form honeycomb patterns with an ultrahigh trapping ratio (>90%), which can image as a microlens array. The investigation reveals that micropillars with a height of 6 µm exhibit the high trapping ratio of particles, which maintain a fine imaging performance. The fast fabrication (more than 2 orders of magnitude enhancement) of furcate slanted pillars paves an avenue for developing innovative microoptics, microfluidics and biological scaffold engineering. A rapid and flexible method for fabricating an even number of furcate slanted micropillars is realized by superimposing opposite optical vortices. The furcate micropillars are directed to capillary-driven self-assembly with intentional spatial arrangement, which can catch SiO2 particles with an ultrahigh trapping ratio (>90%). The furcate pillars pave an avenue for developing innovative microoptics, microfluidics, and biological scaffold engineering.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201701939

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