基于矢量焦点超构透镜的偏振结构及高安全性光学加密
Polarization structures generated through metalenses with vectorial foci for high-security optical encryption
摘要
Abstract
Optical encryption technologies show significant potential applications in information security due to their advantages of parallel processing,large capacity,and low power consumption.Polarization,as an important degree of freedom of light,has attracted extensive research interest in optical encryption through polarization manipulation and multiplexing.However,current polarization control methods based on pixelated or interleaved metasurfaces still face significant challenges,including fabrication complexity and inevitable crosstalk caused by coupling between the neighboring structures,which limits the number of achievable multiplexing channels.A novel encryption method featuring longitudinal variability and cascaded polarization structures realized by metalenses with vectorial foci is proposed in this work.The intensity distributions on different observation planes are simulated using the Fresnel-Kirchhoff diffraction integral.Based on the geometric phase principle,the designed metalens consisting of TiO2 nanopillars with identical dimensions but spatially variant orientation angles,can generate multiple vectorial foci in different observation planes,reconstructing cascaded polarization structures.Here,any two cascaded polarization structures are encoded with mutually orthogonal polarization rotation angles.As the polarization direction of incident linearly polarized light changes,the polarization distribution encoded on the polarization structures can be dynamically modulated,consequently enabling ten-channel information encryption through polarization-dependent intensity redistribution.The encrypted information can only be decoded using the correct keys(incident wavelength,incident polarization state,output light polarization state,and observation position).This method integrates polarization rotation,polarization structure design,and longitudinal/cascaded control,significantly enhancing information capacity and security.It offers promising applications across various fields,such as optical display,encryption,and anti-counterfeiting.关键词
超构透镜/介质超表面/偏振调控/光学加密Key words
metalens/dielectric metasurface/polarization manipulation/optical encryption引用本文复制引用
赵帅富,钟发成,于群星,杨天,邵立,于占军,李艳..基于矢量焦点超构透镜的偏振结构及高安全性光学加密[J].物理学报,2025,74(17):74-84,11.基金项目
河南省高等学校重点研究项目计划基础专项(批准号:23ZX018)、河南省科技攻关项目(批准号:252102211125,242102230072,242102520007,252102230076,242102240087)、大学生创新创业训练计划项目(批准号:202410485056,202410485041)、郑州航空工业管理学院科研团队支持计划专项(批准号:24ZHTD01002)和河南省高等学校重点科研项目(批准号:25B140011)资助的课题. Project supported by the Key Research Projects of Colleges and Universities of Henan Province,China(Grant No.23ZX018),the Key Scientific and Technological Projects of Henan Province,China(Grant Nos.252102211125,242102230072,242102520007,252102230076,242102240087),the Innovation and Entrepreneurship Training Plan for University Students,China(Grant Nos.202410485056,202410485041),the Scientific Research Team Plan of Zhengzhou University of Aeronautics,China(Grant No.24ZHTD01002),and the Key Research Project of Colleges and Universities in Henan Province,China(Grant No.25B140011). （批准号:23ZX018）
