Zhao Naixuan, Li Zile, Zhu Guodong, Li Jiaxin, Deng Liangui, Dai Qi, Zhang Weiguo, He Zhixue, Zheng Guoxing
Opt Express. 2022 Oct 10;30(21):37554-37565. doi: 10.1364/OE.472789.
Structural-color nanoprinting, which can generate vivid colors with spatial resolution at subwavelength level, possesses potential market in optical anticounterfeiting and information encryption. Herein, we propose an ultracompact metasurface with a single-cell design strategy to establish three independent information channels for simultaneous watermarked structural-color nanoprinting and holographic imaging. Dual-channel spectrum manipulation and single-channel phase manipulation are combined together by elaborately introducing the orientation degeneracy into the design of variable dielectric nanobricks. Hence, a structural-color nanoprinting image covered with polarization-dependent watermarks and a holographic image can be respectively generated under different decoded environments. The proposed metasurface shows a flexible method for tri-channel image display with high information capacity, and exhibits dual-mode anticounterfeiting with double safeguards, i.e., polarization-controlled watermarks and a far-field holographic image. This study provides a feasible route to develop multifunctional metasurfaces for applications including optical anticounterfeiting, information encryption and security, information multiplexing, etc.
结构色纳米打印能够在亚波长水平上产生具有空间分辨率的鲜艳色彩，在光学防伪和信息加密领域具有潜在的市场。在此，我们提出一种采用单细胞设计策略的超紧凑型超表面，以建立三个独立的信息通道，用于同时进行水印结构色纳米打印和全息成像。通过在可变介电纳米砖的设计中精心引入取向简并，将双通道光谱操纵和单通道相位操纵结合在一起。因此，在不同的解码环境下，可以分别生成覆盖有偏振相关水印的结构色纳米打印图像和全息图像。所提出的超表面展示了一种用于三通道图像显示的灵活方法，具有高信息容量，并展现出具有双重保障的双模防伪功能，即偏振控制水印和远场全息图像。这项研究为开发多功能超表面提供了一条可行的途径，可用于光学防伪、信息加密与安全、信息复用等应用。
