Metasurface holograms that can be dynamically controlled have attracted wide attention and been realized in many ways. In particular, the phase change materials (PCMs) that can be switched into amorphous and crystalline states at high speed by external thermal stimulation are one of the most promising candidates to break the limitations of material properties and fixed structures. Here we propose a metasurface hologram that aims to realize a dual display that can reconstruct different images by annealing thermal stimulation. The designed metasurface incorporates alternated chalcogenide PCMs cubes and sector columns that possess uniform amplitude and full ${2}\pi $ phase coverage. Simplicity and compactness make this metadevice able to be easily integrated into various applications such as memory storage, augmented reality, anti-counterfeiting, and so on.

中文翻译：

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动态控制超表面全息图的复合纳米结构设计

可以动态控制的超表面全息图已引起广泛关注，并已通过多种方式实现。特别地，可以通过外部热刺激高速转换为非晶态和结晶态的相变材料（PCM）是打破材料性能和固定结构限制的最有前途的候选材料之一。在这里，我们提出了一个超表面全息图，旨在实现一种双重显示，该双重显示可以通过退火热刺激来重建不同的图像。设计的超表面结合了交替的硫属化物PCM立方和扇形柱，它们具有均匀的振幅和完整的$ {2} \ pi $相覆盖。简单性和紧凑性使得该元设备能够轻松集成到各种应用程序中，例如内存存储，增强现实，防伪等等。