Stimuli-responsive geometric transformations endow metamaterials with dynamic properties and functionalities. However, using existing transformation mechanisms to program a single geometry to transform into diverse final configurations remains challenging, imposing crucial design restrictions on achieving versatile functionalities. Here, we present a programmable strategy for wide-spectrum reconfigurable micro-metastructures using linearly responsive transparent hydrogels as artificial muscles. Actuated by the hydrogel, the transformation of micro-metastructures arises from the collaborative buckling of their building blocks. Rationally designing the three-dimensional printing parameters and geometry features of the metastructures enables their locally isotropic or anisotropic deformation, allowing controllable wide-spectrum pattern transformation with programmable chirality and optical anisotropy. This reconfiguration mechanism can be applied to various materials with a wide range of mechanical properties. Our strategy enables a thermally reconfigurable printed metalattice with pixel-by-pixel mapping of different printing powers and angles for displaying or hiding complex information, providing opportunities for encryption, miniature robotics, photonics and phononics applications.

刺激响应几何变换赋予超材料动态特性和功能。然而，使用现有的转换机制对单个几何体进行编程以转换为不同的最终配置仍然具有挑战性，这对实现多功能功能施加了关键的设计限制。在这里，我们提出了一种使用线性响应透明水凝胶作为人造肌肉的广谱可重构微元结构的可编程策略。在水凝胶的驱动下，微观超结构的转变源于其构件的协同屈曲。合理设计元结构的三维打印参数和几何特征，使其能够局部各向同性或各向异性变形，从而实现具有可编程手性和光学各向异性的可控广谱图案变换。这种重构机制可应用于具有广泛机械性能的各种材料。我们的策略实现了热可重构印刷金属晶格，具有不同印刷功率和角度的逐像素映射，用于显示或隐藏复杂信息，为加密、微型机器人、光子学和声学应用提供机会。