Electromagnetic metasurfaces exhibit considerable potential for generating high-purity vortex beams and enabling high-resolution imaging and information encryption.However,traditional GHz devices face challenges,inclu...Electromagnetic metasurfaces exhibit considerable potential for generating high-purity vortex beams and enabling high-resolution imaging and information encryption.However,traditional GHz devices face challenges,including reduced efficiency due to bulky size and material losses.Herein,we designed a multilayer structure and demonstrated through simulations that this configuration served as an efficient transmissive meta-atom.We designed arrays in multiple sizes and finally determined that the optimal minimal unit was the meta-quaternion vortex array,which was subsequently used as the pixel basis for the target image.A digitally patterned GHz metadevice was fabricated and experimentally characterized with right-handed circularly polarized(RCP)light.The experimental results were in excellent agreement with the simulations.We combined the classical nine-grid encryption method(Luoshu)with metasurfaces and introduced the weighted superposition computation technique(WeightLock)to achieve multilayer encryption of target characters.Our research offered novel strategies for the next-generation 5G/6G communication systems,radar detection,and information encryption fields,demonstrating broad application prospects in intelligent communication and advanced radar technologies.展开更多
基金National Key Research and Development Program of China(2024YFE107800)National Natural Science Foundation of China(62205127)+1 种基金Basic Research Program of Jiangsu(BK20231493)Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province(KJS2272)。
文摘Electromagnetic metasurfaces exhibit considerable potential for generating high-purity vortex beams and enabling high-resolution imaging and information encryption.However,traditional GHz devices face challenges,including reduced efficiency due to bulky size and material losses.Herein,we designed a multilayer structure and demonstrated through simulations that this configuration served as an efficient transmissive meta-atom.We designed arrays in multiple sizes and finally determined that the optimal minimal unit was the meta-quaternion vortex array,which was subsequently used as the pixel basis for the target image.A digitally patterned GHz metadevice was fabricated and experimentally characterized with right-handed circularly polarized(RCP)light.The experimental results were in excellent agreement with the simulations.We combined the classical nine-grid encryption method(Luoshu)with metasurfaces and introduced the weighted superposition computation technique(WeightLock)to achieve multilayer encryption of target characters.Our research offered novel strategies for the next-generation 5G/6G communication systems,radar detection,and information encryption fields,demonstrating broad application prospects in intelligent communication and advanced radar technologies.
