Unevenly distributed pixel-based camouflage metasurface hiding multiwavelength holograms in color printing  

作　　者：Yaqin Zheng Yuan Liao Yulong Fan Lei Zhang Zhang-Kai Zhou Dangyuan Lei 

机构地区：[1]Sun Yat-sen University,School of Physics,State Key Laboratory of Optoelectronic Materials and Technologies,Guangzhou,China [2]City University of Hong Kong,Department of Materials Science and Engineering,Department of Physics,Centre for Functional Photonics,Hong Kong Branch of National Precious Metals Material Engineering Research Centre,and Hong Kong Institute of Clean Energy,Kowloon,Hong Kong,China [3]Xi’an Jiaotong University,School of Electronic Science and Engineering,Xi’an,China

出　　处：《Advanced Photonics》2025年第1期23-30,共8页先进光子学(英文)

基　　金：supported by the Innovation and Technology Commission of Hong Kong(Grant No.GHP/026/19GD);the Research Grants Council of Hong Kong(Grant No.Ao E/P-502/20);the National Key R&D Program of China(Grant No.2021YFA1400804);the National Natural Science Foundation of China(Grant No.12222415);the Guangdong Natural Science Fund(Grant Nos.2024B1515040013 and 2020A0505140004);the Guangdong Provincial Quantum Science Strategic Initiative(Grant No.GDZX2305005)。

摘　　要：Ultracompact metasurfaces have gained a high reputation for manipulating light fields precisely within a subwavelength scale,bringing great development to the fields of nanophotonics,integrated optics,and quantum technology.There is broad interest in expanding the working band of metasurfaces to expand functionalities and the scope of applications.However,increasing the number of working wavelengths multiplexed in a single holographic metasurface is always complicated by two vital issues,i.e.,spectral cross talk and the efficiency imbalance between different wavelength channels.Therefore,holographic metasurfaces with multiplexed working wavelengths over three are seldom reported.To address these two issues,we present a design strategy based on unevenly distributed pixels(UEDPs).As a proof of concept,a UEDP-based metasurface is designed to offer a camouflage method to hide four encrypted holographic images in a multicolor printed image.Our results not only demonstrate the idea of UEDP as an easy-to-implement and effective way for strengthening the wavelength multiplexing of metasurfaces but also give rise to a camouflage metasurface by integrating high-capacity and high-security encrypted holographic information with a single printed image.We believe that the generic UEDP-based metasurface design strategy can be readily extended to the realization of artificial functional structures in various disciplines,such as optics,thermology,and acoustics.

关 键 词：metasurface HOLOGRAM CAMOUFLAGE ENCRYPTION 

分 类 号：O436[机械工程—光学工程]