Dual‐Lock Optical Security: Synergizing Circular Polarization and Synaptic Temporal Dynamics

Stable, secure, and high‐bandwidth information transmission in complex environments is a key requirement for smart sensor networks and unmanned systems. However, traditional optical transmission has problems such as information degradation and encryption dependence on complex hardware. Although the emerging neuromorphic encryption can achieve compact and high‐security dynamic encryption with a single device, it is still mainly based on electrical signals, which are limited by its bottlenecks in bandwidth and anti‐interference. To address these challenges, an all‐optical photo‐induced circularly polarized luminescent synapse (PICPLS) is proposed. By combining cholesteric liquid crystals with phosphorescent materials, the physical encryption of circularly polarized light and the temporal encryption of synaptic characteristics are achieved without the need for additional hardware. Furthermore, a dual‐mechanism synaptic polarization cryptosystem (DMSPC) was constructed based on this device to achieve all‐optical encrypted transmission. Under interference conditions, the image recognition accuracy after DMSPC transmission fluctuates by less than 1%, while the image recognition accuracy of the incorrectly decrypted images drops to approximately 25%. Collectively, this system not only reduces the hardware requirements but also significantly enhances the stability and security of information transmission, thereby providing a highly integrated and reliable solution for more secure all‐optical transmission in complex environments.