Flexible Plasmonic Metasurfaces with User‐Designed Patterns for Molecular Sensing and Cryptography

Flexible plasmonic metasurfaces have garnered considerable attention because the material's mechanical flexibility enables new functionalities and integrated applications. Here, by adopting low‐cost materials and simple techniques, we demonstrate a method of fabricating large flexible metasurfaces with arbitrary user‐designed iridescent patterns. These naked‐eye recognizable patterns together with their excellent plasmonic activities have yielded new functionalities and novel applications. Demonstrations include plasmonic sensing, reflective displays, developing new encryption strategies and integrated devices, etc. Moreover, the low fabrication cost (<US$ 0.03 cm⁻²) would enable the practical use of the material. The metasurface can even be fashioned into an innovative, multifunctional medical ID bracelet. We believe our flexible plasmonic metafilm will inspire the fabrication of many novel applications and open up new horizons in various fields.