Toward Ultra‐High‐Capacity Meta‐Optics Storage: 3D Data Cube Encrypted via Arbitrary Spatial Coordinates

Abstract Optical holographic data storage technologies are increasingly critical for next‐generation information systems due to their advantages in storage density, stability, and security. However, current holographic storage approaches are limited by a small number of optical degrees of freedom, restricting both the multiplexing capacity and the expansion of independent channels, and by fixed spatial coordinate encoding, which hinders full utilization of 3D spatial information in Fresnel holography. Here, a 3D data encryption cube storage strategy is proposed and experimentally demonstrated, based on arbitrary holographic coordinate definition within the Fresnel region, enabled by an on‐chip meta‐device. By leveraging guided‐wave‐driven detour phase manipulation and optimizing the light field via an angular spectrum method integrated with a gradient descent algorithm, up to 160 spatially distinct holographic channels are realized with an equivalent storage density reaching over 200 000 dpi. Each spatial coordinate inherently serves as an encryption key, enabling secure and spatially selective data retrieval. Simultaneously, the proposed scheme suppresses zero‐order diffraction, enhancing holographic reconstruction fidelity. This work offers a promising pathway toward high‐capacity, high‐security optical storage and 3D holographic applications.