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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
Published on: September 25, 2020
Dynamic optical stealth hydrogel for information encryption
Yi Yang1, Jingfan Wan2, Songzhi Gao3
1State Key Laboratory of Bio-fibers and Eco-textiles, College of Materials Science and Engineering, Collaborative Innovation Center of Shandong Marine Biobased Fibers and Ecological Textiles, Institute of Marine Biobased Materials, Qingdao University, Qingdao 266071, China. zhenchuanyu@qdu.edu.cn.
Abstract:
Physical-layer optical encryption offers intuitive readout and resistance to unauthorized copying. Here, we report a dynamically reconfigurable platform based on a polyacrylamide hydrogel lenticular lens array, where effective line-density matching acts as a physical key. The array decodes otherwise invisible information from printed media and smartphone screens, enabling reversible information display and concealment for optical encryption and anti-counterfeiting.
