Kirigami enables versatile shape transformation from two-dimensional (2D) precursors to 3D architectures with simplified fabrication complexity and unconventional structural geometries. We demonstrate a one-step and on-site nano-kirigami method that avoids the prescribed multistep procedures in traditional mesoscopic kirigami or origami techniques. The nano-kirigami is readily implemented by in situ cutting and buckling a suspended gold film with programmed ion beam irradiation. By using the topography-guided stress equilibrium, rich 3D shape transformation such as buckling, rotation, and twisting of nanostructures is precisely achieved, which can be predicted by our mechanical modeling. Benefiting from the nanoscale 3D twisting features, giant optical chirality is achieved in an intuitively designed 3D pinwheel-like structure, in strong contrast to the achiral 2D precursor without nano-kirigami. The demonstrated nano-kirigami, as well as the exotic 3D nanostructures, could be adopted in broad nanofabrication platforms and could open up new possibilities for the exploration of functional micro-/nanophotonic and mechanical devices.

中文翻译：

---

具有巨大光学手性的纳米折纸。

Kirigami实现了从二维（2D）前体到3D体系结构的通用形状转换，并简化了制造复杂性和非常规的结构几何形状。我们演示了一种一步式现场纳米折纸方法，该方法避免了传统的介观折纸或折纸技术中规定的多步骤程序。通过用编程的离子束辐照原位切割和弯曲悬浮的金膜，可以轻松实现纳米千纸鹤。通过使用地形引导的应力平衡，可以精确地实现丰富的3D形状转换，例如纳米结构的屈曲，旋转和扭曲，这可以通过我们的机械建模来预测。得益于纳米级3D扭曲特性，通过直观设计的类似3D风车的结构实现了巨大的光学手征性，与没有纳米千纸鹤的非手性2D前体形成鲜明对比。所展示的纳米千纸鹤以及奇异的3D纳米结构可以在广泛的纳米加工平台中采用，并可以为探索功能性微/纳米光子和机械设备开辟新的可能性。