Metasurface holographic encryption, as an emerging and highly promising technique, presents the advantages of multi‐dimension and high security and consequently provides a flexible and convenient platform for information encryption. Recent years have witnessed rapid progress in meta‐holographic encryption through the utilization of different dimensions of electromagnetic (EM) waves, yet enhancing the capacity and security of encrypted information remains an endless goal. In this context, the concept of three physical dimensions encrypted metasurface holography is proposed in which orbital angular momentum (OAM) is fully synergized with frequency and polarization state. The mechanism relies on the simultaneous control of these dimensions and arbitrarily overlaying them in each operation channel, thereby acting as a multi‐dimensional key to realize information encryption and decryption. As a proof‐of‐concept experiment, a three‐physical dimension encrypted meta‐hologram is designed that conceals four real images as encrypted information in 32 information channels. Remarkably, a specific OAM order, frequency, and polarization state is required to decrypt the designed meta‐hologram. This work opens a new avenue for multi‐dimensional encrypted holography, which has broad application prospects for information security and data storage in the era of big data.

中文翻译：

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由轨道角动量、频率和偏振加密的多维元全息术

超表面全息加密作为一种新兴的、极具前景的技术，具有多维度、高安全性的优势，为信息加密提供了灵活便捷的平台。近年来，通过利用不同维度的电磁波，元全息加密取得了快速进展，但增强加密信息的容量和安全性仍然是一个永无止境的目标。在此背景下，提出了三个物理维度加密超表面全息术的概念，其中轨道角动量（OAM）与频率和偏振态充分协同。该机制依靠对这些维度的同时控制，并在各个操作通道中任意叠加，从而充当多维密钥来实现信息加密和解密。作为概念验证实验，设计了一个三物理维度加密元全息图，将四个真实图像隐藏为 32 个信息通道中的加密信息。值得注意的是，需要特定的 OAM 阶数、频率和偏振态来解密设计的元全息图。该工作为多维加密全息技术开辟了一条新途径，在大数据时代的信息安全和数据存储方面具有广阔的应用前景。