Premium
Multifurcate Assembly of Slanted Micropillars Fabricated by Superposition of Optical Vortices and Application in High‐Efficiency Trapping Microparticles
Author(s) -
Ni Jincheng,
Wang Zhongyu,
Li Ziqin,
Lao Zhaoxin,
Hu Yanlei,
Ji Shengyun,
Xu Bing,
Zhang Chenchu,
Li Jiawen,
Wu Dong,
Chu Jiaru
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201701939
Subject(s) - microlens , materials science , optical tweezers , fabrication , microfluidics , trapping , holography , superposition principle , nanotechnology , optoelectronics , honeycomb , optics , lens (geology) , composite material , physics , medicine , ecology , alternative medicine , pathology , quantum mechanics , biology
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 SiO 2 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.