Fabry‐Pérot Microlaser Arrays Digitalized by Intra‐Cavity Microlenses for Multiply Programmable Optical Encryption

Abstract Optical encryptions based on micro/nanophotonics attracts significant interest for its high security and capacity. Among promising device platforms, microcavity lasers offer distinct advantages for information labeling and encryption through unique lasing characteristics, such as spectral fingerprints. Image‐like outputs, including lasing modes and patterns, facilitate parallel multimodal information processing and are compatible with integrated schemes using optoelectronic sensors and processors, although it remains largely underexplored. In this work, an imaging‐based digital encryption platform is developed in principle using Fabry–Pérot (FP) microlaser arrays that are intra‐cavity‐integrated with custom‐designed micro‐optics. Microlenses (MLs) are designed and fabricated directly on a cavity mirror by two‐photon lithography (TPL), forming a ML‐integrated FP microcavity when paired with another mirror. By coordinating the microlens focal length with the cavity length, FP microlasers arrays are constructed with customizable high Q ‐factors, small mode volumes, and lasing thresholds. A spatially programmed microlens array (MLA), together with cavity length and pump energy, functions as a triple key for the optical multi‐attribute encryption system. Finally, a multi‐key authentication scheme based on micro Quick Response (QR) codes is demonstrated through lasing patterns of heterogeneous microlaser arrays. This work presents a digitalizable and scalable tools for all‐optical or optoelectronic anti‐counterfeiting and data encryption applications.