Full‐Color High‐Capacity Dynamic Information Encryption Based on Femtosecond Laser‐Induced Forward Transfer

Abstract The development of dynamic 3D codes is widely studied, especially for smart information protection and advanced dynamic information encryption. However, it is challenging to fabricate information carriers with full color, dynamic properties under external stimuli, and high capacity, which restricts their applications. Here, microsized dynamic full color fluorescent 3D codes are successfully fabricated using the multilayer‐independent femtosecond laser‐induced forward transfer (FsLIFT) technology, which achieves simultaneous high‐resolution transferring and patterning. The combination and excitation of multilayered quantum dots film with different colors and patterns ensure dynamic information transformation of the 3D codes. Due to the high spatial resolution of the FsLIFT, the minimum line width of the patterns can reach 1.78 µm, which ensures a high capacity for encoding. In addition, the decoding process of the microsized dynamic fluorescent 3D codes only requires smartphones, microscope patches, and portable light sources. Finally, the facile fabrication and decoding process as well as the customizable patterning abilities demonstrate the practical application potential for the advanced dynamic coding.