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arXiv 2207.08136physics.opticsphysics.app-ph
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用于动态图像显示和信息加密的相变超表面

Phase-change metasurfaces for dynamic image display and information encryption

Tingting Liu, Zhou Han, Junyi Duan, Shuyuan Xiao

摘要:

光学超颖表面能够以前所未有的水平设计电磁空间并控制光传播,为实现多个物理维度上的光调制提供了强大的工具。在这里,我们展示了Sb $_{2}$ S $_{3}$相变超表面平台,其允许幅度和相位的主动操纵。特别是,我们实现了动态纳米打印和全息图像显示,通过调整这种相变材料的结晶水平。被定制为用于幅度、几何和传播相位调制的Sb $_{2}$ S $_{3}$纳米块构成复用超颖表面中的动态超原子。利用入射光的偏振态作为解码密钥,编码后的信息可以在近场再现为一幅非印刷灰度图像,在远场再现为两幅全息图像。这些图像可以通过利用Sb $_{2}$ S $_{3}$纳米结构在非晶态和晶态之间的可逆可调谐性来打开和关闭。相变元表面具有多种信息和多重加密功能,有望实现高容量和高安全性的超紧凑数据存储,这为现代密码学和安全应用提供了一个令人兴奋的方向。

英文摘要:

Optical metasurfaces enable to engineer the electromagnetic space and control light propagation at an unprecedented level, offering a powerful tool to achieve modulation of light over multiple physical dimensions. Here, we demonstrate a Sb$_{2}$S$_{3}$ phase-change metasurface platform that allows active manipulation of both amplitude and phase. In particular, we implement dynamic nanoprinting and holographic image display through tuning crystallization levels of this phase-change material. The Sb$_{2}$S$_{3}$ nanobricks tailored to function the amplitude, geometric and propagation phase modulation constitute the dynamic meta-atoms in the multiplexed metasurfaces. Using the incident polarizations as decoding keys, the encoded information can be reproduced into a naonprinting grayscale image in the near field and two holographic images in the far field. These images can be switched on and off by taking advantages of the reversible tunability of Sb$_{2}$S$_{3}$ nanostructure between amorphous and crystalline states. The proposed phase-change metasurfaces featuring manifold information and multifold encryption promise ultracompact data storage with high capacity and high security, which suggests an exciting direction for modern cryptography and security applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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