The complex degrees of freedom of light, such as amplitude, phase, polarization, and orbital angular momentum, make it a prime candidate for use in optical security and encryption. By exploiting the unique characteristics of metasurfaces, exciting new optical security platforms have been demonstrated.

中文翻译：

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用超表面开启光学安全的未来

光的复杂自由度，如振幅、相位、偏振和轨道角动量，使其成为用于光学安全和加密的主要候选者。通过利用超表面的独特特性，已经展示了令人兴奋的新光学安全平台。