Hidden Structural Colors from Bistable, Electrically Driven COF Photonic Assemblies for Secure Optical Encoding
2025
Optical encryption based on nanostructured materials offers an innovative approach to secure data encoding. Here, we report an electrically addressable, colloidal photonic platform using covalent organic framework (COF) particles that enables dynamic, bistable image encryption. Through the electrophoretic self-assembly of size-controlled COF particles within patterned cells, we achieve spatially resolved Bragg reflections visible only under bright-field (BF) microscopy. The encrypted optical states remain hidden t…