Abstract Multi-channel information encryption technology has been implemented by optical metasurfaces owing to their superior ability to control the phase, amplitude, wavelength and polarization of incident light. However, current metasurface-based multi-channel encryption technologies suffer from information leakage in non-full channel decoding processes. To better increase the security of the encrypted information, we develop a secret shared phase encoding scheme by combining a visual secret sharing scheme with a metasurface-based phase-encoding technique. Our method achieves its high-concealment through mapping the target image into a set of unrecognizable phase-only keys that are subsequently encoded by a multi-wavelength metasurface. In the decryption process, the secret information can be reconstructed only by decoding and stacking all the wavelength channels of the metasurface. At the same time, chaotic images can be extracted from the other channels without revealing any original information. The simulated results and the theoretical analysis show the strong robustness and high security of our encryption setup, which is sure to find applications in emerging optical encryption schemes.

中文翻译：

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使用多波长超表面通过秘密共享相位编码方案实现的高级加密方法

摘要 光学超表面因其对入射光的相位、幅度、波长和偏振具有优越的控制能力，已经实现了多通道信息加密技术。然而，当前基于超表面的多通道加密技术在非全通道解码过程中存在信息泄漏问题。为了更好地提高加密信息的安全性，我们通过将视觉秘密共享方案与基于超表面的相位编码技术相结合，开发了一种秘密共享相位编码方案。我们的方法通过将目标图像映射到一组无法识别的仅相位键来实现其高度隐藏，这些键随后由多波长超表面编码。在解密过程中，只有通过解码和堆叠超表面的所有波长通道才能重建秘密信息。同时，可以在不泄露任何原始信息的情况下从其他通道中提取混沌图像。模拟结果和理论分析表明我们的加密设置具有很强的鲁棒性和高安全性，肯定会在新兴的光学加密方案中找到应用。