Dual-Channel Binary Gray-Image Display Enabled with Malus-Assisted Metasurfaces
Dual-Channel Binary Gray-Image Display Enabled with Malus-Assisted Metasurfaces
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利用 Malus 辅助超表面实现双通道二值灰度图像显示
DOI：
10.1103/physrevapplied.14.034002
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发表时间：
2020-09-01
影响因子：
4.6
通讯作者：
Zheng, Guoxing
中科院分区：
文献类型：
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作者：
Dai, Qi;Zhou, Nan;Zheng, Guoxing
由各向异性纳米结构组成的亚表面具有同时操纵光的偏振和强度的能力，这为构建能够以高分辨率和可靠性显示灰度图像的多路亚表面铺平了道路。然而，以往用于灰度图像显示的多路复用元设备大多是基于具有不同几何形状和/或超单元设计策略的纳米结构，这使得元表面的设计和制造变得复杂，或者降低了信息分辨率。在这里，受益于马吕斯定律中隐含的取向简并，我们证明了灰度图像多路传输可以简单地通过单一尺寸的纳米结构设计方法来实现。具体地说，通过配置银纳米块的四步取向，可以建立两个独立的信息通道，将不同的灰度图像存储到单个亚表面中。我们实验演示了Malus辅助的亚表面，它的功能是作为一个双通道灰度图像显示设备来记录两个独立的二值灰度图像，而不会产生串扰。在单一尺寸的设计策略下，每块纳米砖可以记录两个通道的信息，所提出的变形表面同时对两个灰度图像都具有84667点/英寸的超高信息密度。该亚表面具有纳米结构设计简单、超致密、高分辨率、工作窗口宽、安全性高等优点，使其在防伪、信息隐藏、信息多路传输、超致密图像显示、高密度光存储、集成和多路传输纳米光电子学等领域得到了进一步的研究和应用。
Metasurfaces composed of anisotropic nanostructures possess the ability to manipulate the polarization and intensity of light simultaneously, which paves an emerging way to construct multiplexing metadevices capable of displaying gray images with high resolution and reliability. However, previous multiplexing metadevices for gray-image displaying are mostly based on nanostructures with varied geometries and/or supercell design strategies, which complicate both the metasurface design and manufacturing or decrease the information resolution. Here, benefiting from the orientation degeneracy implied in Malus's law, we show that gray-image multiplexing can be implemented simply by a single-sized nanostructure-design approach. Specifically, by configuring the four-step orientations of silver nanobricks, two independent information channels can be established to store different gray images into a single metasurface. We experimentally demonstrate the Malus-assisted metasurface, which functions as a dual-channel gray-image display device to record two independent binary gray images without crosstalk. With the single-sized design strategy, each nanobrick can record information of two channels, and the proposed metasurface simultaneously owns an ultrahigh information density of 84 667 dots per inch for both of the two gray images. With advantages such as simplicity in nanostructure design, ultracompactness, high resolution, broadband working windows, and high security, the proposed metasurfaces empower advanced researches and applications in anticounterfeiting, information hiding, information multiplexing, ultracompact image displaying, high-density optical storage, integrated and multiplexed nanooptoelectronics, etc.