Multimodal Synergistic Optical Encryption Using Holographic Cholesteric Liquid Crystal Polymer Composite Films

ABSTRACT Integrating multiple optical encryption channels within a single thin‐film platform is essential for increasing information capacity while avoiding the complexity associated with multilayer architectures. Herein, we report a holographic cholesteric liquid crystal composite films (HCLC‐CFs) that integrates thermally programmable structural color, holographic phase modulation, and UV/thermal dual‐responsive fluorescence within a single‐layer optical encryption platform. Upon thermal stimulation, thermomechanical deformation of the polymer network simultaneously governs the evolution of the cholesteric pitch and the anisotropic deformation of the holographic grating, enabling coordinated wavelength tuning and dynamic phase modulation. Meanwhile, the incorporated fluorescent system exhibits dual thermo‐ and photo‐responsive emission, with reversible thermal fluorescence evolution providing an additional one‐time authentication capability. Consequently, wavelength, phase, and fluorescence evolve cooperatively under a common external stimulus, enabling hierarchical multimodal information encryption through coordinated optical decoding. This work demonstrates an effective strategy for developing integrated responsive photonic materials for advanced anti‐counterfeiting and high‐security optical information storage.