By virtue of the extraordinary capability of manipulating the polarization state, amplitude and phase of electromagnetic fields, metasurfaces can be employed to display holographic or nanoprinting images with unprecedented spatial resolution. Bringing holography and nanoprinting together is an effective way toward information multiplexing. However, current approaches mostly utilize interleaving or stacking nanostructures with different functionalities to construct multiplexed metasurfaces, hence they are equivalent to a combination of several metasurfaces and the information capacity of each metasurface remains unchanged. Here, by combining intensity modulation governed by Malus's law with phase manipulation based on both geometric and propagation phases, a single‐cell‐designed metasurface for three‐channel image displays is proposed. The new design strategy can significantly improve the information capacity since the extra phase modulation originates from the orientation degeneracy and dimension variation of nanostructures rather than multilayer or interleaving design. Specifically, a three‐channel metasurface is experimentally demonstrated, which can simultaneously record a continuous grayscale nanoprinting image in the near field and project two independent holographic images in the far field. With the advantages of crosstalk‐free and ultracompactness, the proposed three‐channel metasurfaces can empower the design of multifunctional nano‐optical elements for applications in image displays, optical anticounterfeiting, optical storage and many other related fields.

中文翻译：

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同步元全息和元纳米印刷的三通道元表面：一种单细胞设计方法

凭借操纵电磁场的极化状态，幅度和相位的非凡能力，超颖表面可用于以前所未有的空间分辨率显示全息或纳米印刷图像。将全息术和纳米印刷结合在一起是实现信息复用的有效方法。然而，当前的方法大多利用具有不同功能的交织或堆叠的纳米结构来构造多重的超颖表面，因此它们等效于多个超颖表面的组合，并且每个超颖表面的信息容量保持不变。在此，通过将基于马洛斯定律的强度调制与基于几何和传播相位的相位操纵相结合，提出了一种用于三通道图像显示的单单元设计超颖表面。新的设计策略可以显着提高信息容量，因为额外的相位调制源自纳米结构的取向退化和尺寸变化，而不是多层或交错设计。具体来说，通过实验证明了三通道超颖表面，它可以在近场中同时记录连续的灰度纳米打印图像，并在远场中投影两个独立的全息图像。凭借无串扰和超紧凑的优势，拟议的三通道超表面可以设计用于图像显示，光学防伪，光学存储和许多其他相关领域的多功能纳米光学元件。