Structural Color Manipulation of Organic Films by Soft Plasma for Information Encryption and Anti-Counterfeiting

Structural color in thin films offers promising applications in optical encryption and anti-counterfeiting. The conventional solution-based methods struggle with continuous thickness control and patterning compatibility. Multicolor modulation of single-matter films is achieved by introducing a soft plasma etching technique that can uniformly thin the films. Combined with an improved transfer matrix method that can accurately simulate the thin-film interference effect, the film color can be simulated. It not only enables the precise modulation of film color, but also establishes a data set for neural networks. The addition of neural networks extends the application of structural color and the application of information anti-counterfeiting and encryption is demonstrated (with 99% accuracy). This dual approach of physical etching and intelligent design establishes a powerful platform for structural color engineering, opening up possibilities for secure imaging and dynamic optical devices.