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Metasurfaces provide a novel platform for information encryption due to their incomparable competence for the manipulation of different optical characteristics. Most current encryption schemes, however, decrypt the hidden information through a direct illumination of the metasurface, and the security of which cannot be fully guaranteed since the number of illumination condition is very limited and...
Metasurfaces, simultaneously operating in near‐ and far‐fields, can be employed as a promising candidate to implement different functions, thus significantly improving the information density, security, and system integration. Recent works have showcased some approaches for decoupling‐at‐large between near‐ and far‐field functionalities, but unfortunately, their coupling effects are just reduced and...
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