Capillary-force-driven self-assembly (CFSA) has been combined with many top-down fabrication methods to be alternatives to conventional single micro/nano manufacturing techniques for constructing complicated micro/nanostructures. However, most CFSA structures are fabricated on a rigid substrate, and little attention is paid to the tuning of CFSA, which means that the pattern of structures cannot be regulated once they are manufactured. Here, by combining femtosecond laser direct writing with CFSA, a flexible method is proposed to fabricate self-assembled hierarchical structures on a soft substrate. Then, the tuning of the self-assembly process is realized with a mechanical-stretching strategy. With this method, different patterns of tunable self-assembled structures are obtained before tuning and after release, which is difficult to achieve with other techniques. In addition, as a proof-of-concept application, this mechanical tunable self-assembly of microstructures on a soft substrate is used for smart displays and versatile micro-object trapping.

中文翻译：

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机械可调的毛细管力驱动的自组装分层结构在软基板上

毛细作用力驱动的自组装（CFSA）已与许多自上而下的制造方法相结合，以替代传统的单个微/纳米制造技术来构造复杂的微/纳米结构。但是，大多数CFSA结构是在刚性基板上制造的，因此很少注意CFSA的调整，这意味着一旦制造结构，就无法调节其图案。在此，通过将飞秒激光直接写入与CFSA相结合，提出了一种灵活的方法来在软基板上制造自组装的分层结构。然后，通过机械拉伸策略实现自组装过程的调整。使用这种方法，可以在调音之前和释放之后获得不同模式的可调自组装结构，这是其他技术难以实现的。此外，作为概念验证应用，这种在软基板上的微结构的机械可调自组装可用于智能显示器和通用的微物体捕获。