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Fig. 1 | PhotoniX

Fig. 1

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

Fig. 1

Schematic illustration of cascaded metasurfaces based perfect HDPBs for optical encryption. The plaintext is encrypted into two cascaded metasurfaces with multiple cells. According to the customized keys in the form of coordinates (x1, y1, x2, y2) of two arrayed metasurfaces, cascading two specific cells (marked by red dashed lines) could generate two perfect HDPBs under RCP and LCP incidences. The states of two generated HDPBs can be independently described by the magenta and blue high-dimensional Poincaré spheres. Through characterizing the HDPBs by RCP/LCP analyzers for RCP/LCP incidences, the annular intensity distributions (outlined within green/red dashed lines) are presented and could be translated into different messages for information decryption

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