High-dimensional Poincaré beams generated through cascaded metasurfaces for high-security optical encryption

National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, China

Funds: The authors acknowledge the funding provided by National Key Research and Development Program of China (2022YFA1404301), National Natural Science Foundation of China (Nos. 62325504, 62305149, 92250304, 62288101), and Dengfeng Project B of Nanjing University. The authors acknowledge the micro-fabrication center of the National Laboratory of Solid State Microstructures (NLSSM) for technique support.

摘要

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Abstract:
Optical encryption plays an increasingly important role in the field of information security owing to its parallel processing capability and low power consumption. Employing the ultrathin metasurfaces in optical encryption has promoted the miniaturization and multifunctionality of encryption systems. Nevertheless, with the few number of degrees of freedom (DoFs) multiplexed by single metasurface, both key space and encoding space are limited. To address this issue, we propose a high-security and large-capacity optical encryption scheme based on perfect high-dimensional Poincaré beams with expanded DoFs. By cascading two arrayed metasurfaces, more beam properties can be independently engineered, which gives rise to the extensively expanded key and encoding spaces. Our work provides a promising strategy for optical encryption with high security level and large information capacity and might facilitate the applications of Poincaré beams in optical communications and quantum information.

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参考文献(54)

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