Kirigami helps 3D nano-fabrication

The Academy’s researchers use a focused ion beam to cut a precise pattern in a free-standing gold nanofilm, then use the same beam to pull the nanopattern into a 3D shape.

The pulling forces were induced by heterogeneous vacancies and the implanted ions within the gold nanofilm during ion beam irradiation.

By utilizing the topography-guided stress equilibrium within the nanofilm, versatile 3D shape transformations such as upward buckling, downward bending, complex rotation and twisting of nanostructures were precisely achieved.

The researchers produced a 3D pinwheel-like structure with giant optical chirality.