轨道角动量复用三维加密全息图  

Orbital angular momentum multiplexing three-dimensional encrypted hologram

作　　者：方国全 林瀚 王思越 彭璞 方哲宇[1] FANG Guoquan;LIN Han;WANG Siyue;PENG Pu;FANG Zheyu(School of Physics,State Key Lab for Mesoscopic Physics,Peking University,Beijing 100871,China)

机构地区：[1]北京大学物理学院,人工微结构和介观物理国家重点实验室,北京100871

出　　处：《物理学报》2025年第6期87-94,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:12027807,62225501,62321004);国家重点研发计划(批准号:2020YFA0211300);北京大学高性能计算校级公共平台资助的课题.

摘　　要：经过几十年的发展,全息成像已成为展示信息的成熟光学技术.然而,仅通过光的波长和偏振作为信息传递的载体的传统全息技术,在信息传播的安全性和容量方面存在一定的不足.将一种新的光学维度,轨道角动量(orbital angular momentum,OAM),引入全息成像为这些问题提供了一个有效的解决方案.通过使用OAM复用的全息技术进行理论分析和仿真计算,二维图像被加密和存储.然后三维物体被切片为多幅二维图像,通过OAM复用的全息技术被存储于一个相位阵列中,实现了信息存储维度的有效降低,并且经过OAM复用的全息技术被成功复现,因而三维全息被实现.此外,每幅图按照相应拓扑荷进行加密,信息传递的安全性被显著提升.这种具有OAM选择性的全息技术更为安全,信息通量更大,具有广泛的应用潜力.After decades of development,holography has evolved into a sophisticated optical technology for information display.Traditional holographic techniques,which rely solely on the wavelength and polarization of light as information carriers,are limited in both security and capacity of information.The introduction of orbital angular momentum(OAM)as an additional optical dimension into holography effectively addresses these challenges.In order to maintain the OAM mode characteristics of the original image,spatial discrete sampling must be performed first.The sampled image undergoes Fourier transform to generate a discrete hologram.An OAM-selective hologram is then constructed by multiplying the discrete hologram with a spiral phase factor.By superimposing multiple selective holograms with varying topological charges,an OAMmultiplexing hologram is generated.Using this approach,computer simulations of OAM-based holography demonstrate the encryption of multiple two-dimensional images with different topological charges(l_(i))into an OAM-multiplexing hologram for storage.Decryption is achieved by illuminating the multiplexing hologram with a reproduction beam of a specific topological charge.When the condition(l′_(i)+l_(i)=0)is satisfied,the original image associated with the corresponding topological charge is successfully reproduced.Furthermore,a three-dimensional object,such as a rose in the article,can be decomposed into multiple two-dimensional planes by using a layering method.Holograms for each layer are generated based on their spatial positions and a custom function f that assigns topological charges(l_(i)).These holograms are stored in a phase array through OAM-multiplexing holography,effectively reducing the dimensionality of information storage.By setting different reproduction charges(l′_(i)),the holograms are successfully reconstructed.The spatial position of each layer is determined by the function f,enabling the replicating and stacking of layers to achieve a three-dimensional reconstruction of the rose,

关 键 词：轨道角动量 全息图 3D 成像 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构] O438.1[自动化与计算机技术—计算机科学与技术]