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Four-dimensional (4D) printing of shape memory polymer (SMP) imparts timeresponsive properties to 3D structures. Here, we explore 4D printing of a SMPin the submicron length scale, extending its applications to nanophononics. Wereport a new SMP photoresist based on Vero Clear achieving print features at aresolution of ~300 nm half pitch using two-photon polymerization lithography(TPL). Prints consisting of grids with size-tunable multi-colours enabled thestudy of shape memory effects to achieve large visual shifts through nanoscalestructure deformation. As the nanostructures are flattened, the colours andprinted information become invisible. Remarkably, the shape memory effectrecovers the original surface morphology of the nanostructures along with itsstructural colour within seconds of heating above its glass transitiontemperature. The high-resolution printing and excellent reversibility in bothmicrotopography and optical properties promises a platform fortemperature-sensitive labels, information hiding for anti-counterfeiting, andtunable photonic devices.

Structural Multi-Colour Invisible Inks with Submicron 4D Printing of Shape Memory Polymers