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The emerging Internet of Things (IoTs) invokes increasing security demandsthat require robust encryption or anti-counterfeiting technologies. Albeitbeing acknowledged as efficacious solutions in processing elaborate graphicalinformation via multiple degrees of freedom, optical data encryption andanti-counterfeiting techniques are typically inept in delivering satisfactoryperformance without compromising the desired ease-of-processibility orcompatibility, thus leading to the exploration of novel materials and devicesthat are competent. Here, a robust optical data encryption technique isdemonstrated utilizing polymer-stabilized-liquid-crystals (PSLCs) combined withprojection photoalignment and photopatterning methods. The PSLCs possessimplicit optical patterns encoded via photoalignment, as well as explicitgeometries produced via photopatterning. Furthermore, the PSLCs demonstrateimproved robustness against harsh chemical environments and thermal stability,and can be directly deployed onto various rigid and flexible substrates. Basedon this, it is demonstrated that single PSLC is apt to carry intricateinformation, or serve as exclusive watermark with both implicit features andexplicit geometries. Moreover, a novel, generalized design strategy isdeveloped, for the first time, to encode intricate and exclusive informationwith enhanced security by spatially programming the photoalignment patterns ofa pair of cascade PSLCs, which further illustrates the promising capabilies ofPSLCs in optical data encryption and anti-counterfeiting.

Robust Optical Data Encryption by Projection-Photoaligned Polymer-Stabilized-Liquid-Crystals