Schematic of a modular diffractive neural network–based photonic encryption metahologram (IMAGE)

Pohang University of Science & Technology (POSTECH)

Schematic of a modular diffractive neural network–based photonic encryption metahologram

Caption

Schematic of secure holography using a reconfigurable stacked metasurface based on a modular diffractive deep neural network. Each metasurface layer independently reconstructs distinct wavelength-encoded holograms (e.g., ID and QR). When two layers are aligned at a specific interlayer spacing, the system is trained to reveal an encrypted hologram (PW). Because decryption is enabled by the combined choice of wavelength and interlayer spacing as physical decoding keys, the information can be retrieved without electronic computation. This single platform integrates standalone (layer-wise), combinational (cipher), and multi-wavelength functionalities, enabling a photonic security platform for optical encryption and data storage.

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POSTECH

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