ACS Appl Mater Interfaces. 2018 Oct 24;10(42):36369-36376. doi: 10.1021/acsami.8b11173. Epub 2018 Oct 9.
This article presents a new method for fabricating complex cross-sectional microtubes with a high aspect ratio at micro/nanoscale. The microtubes are directly written in a photoresist using a femtosecond pulsed laser combined with a spatial light modulator (SLM). A new method for generating a C-shaped Bessel beam by modifying the Bessel beams with a SLM is reported for the first time. Using this gap-ring-shaped light field, microtubes with special cross section (trefoil-shaped, clover-shaped, spiral, etc.) have been first achieved through two-photo polymerization rapidly. The microtube wall can reach about 800 nm and the diameter of the gap-ring structure is only a few micrometers. As a demonstration, artificial stomata were manufactured with the same size as actual plants stomata consisting of gap-ring microtubes. This artificial stomata can mimic the function of the real stomata with rapid opening and closing, demonstrating its ability to trap and release microparticles regulated by rinse solvent.
本文提出了一种在微纳尺度下制造具有高纵横比的复杂截面微管的新方法。该微管是通过飞秒脉冲激光与空间光调制器（SLM）相结合直接在光刻胶中写入的。首次报道了一种通过 SLM 对贝塞尔光束进行修正来产生 C 形贝塞尔光束的新方法。利用这种缝隙环型光场，首次通过双光子聚合快速实现了具有特殊截面（三叶形、四叶草形、螺旋形等）的微管。微管壁可达 800nm 左右，缝隙环结构的直径只有几微米。作为演示，制造了具有与实际植物气孔相同尺寸的人工气孔，其由缝隙环微管组成。这种人工气孔可以模拟真实气孔的快速开闭功能，展示了其通过冲洗溶剂来捕获和释放微粒子的能力。
