基于自由透镜相位的多维度轨道角动量全息(特邀)  

Multi-dimensional Orbital Angular Momentum Holography Based on Free Lens Phase(Invited)

作　　者：于鑫阳 李发静 罗嘉祺 陈克莉 聂守平[1] 袁操今[1] YU Xinyang;LI Fajing;LUO Jiaqi;CHEN Keli;NIE Shouping;YUAN Caojin(Jiangsu Key Laboratory of Optoelectronic Technology,School of Physical Science and Technology,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]南京师范大学物理科学与技术学院江苏省光电技术重点实验室,南京210023

出　　处：《光子学报》2024年第10期73-84,共12页Acta Photonica Sinica

基　　金：国家自然科学基金(No.62175112)。

摘　　要：光学轨道角动量全息是一种有效的信息存储和加密技术,但轨道角动量这一单个维度已经无法满足日益增加的复用容量需求,拓展额外的复用自由度是该项技术的发展方向。构建了一种将多参数可调的自由透镜相位引入轨道角动量全息中实现径向、角向和轴向三个维度联合复用的方案。模拟和实验结果均表明,只有用与编码拓扑荷值l符号相反的、径向位移参数r0以及焦距f相同的自由透镜相位所调制的完美光学涡旋照射时,方可重建出正确的目标图像。此外,将自由透镜相位中的形状控制因子q作为额外的编码载体,进一步增加复用全息的信道数量。同时,还证明了基于自由透镜相位的轨道角动量全息可以实现分数阶拓扑荷复用。该技术将轨道角动量全息技术与光场调控技术相结合,提高了全息加密的安全性,增加了复用信道的自由度,在通信领域具有潜在的应用前景。Computer generated holography simulates the recording process of traditional optical holography by using computers to encode the amplitude and phase information of an object,and is able to achieve the information reconstruction of a virtual three-dimensional object in space,which has been widely used in the fields of three-dimensional display,optical storage and optical encryption.With the increasing complexity of 3D information,the amount of information storage requirements,and the amount of encrypted data,multiplexing in computer generated holography using space,time,wavelength and polarization dimensions has become an inevitable trend.However,with the explosive growth of information,the existing dimensions are about to be exploited.OAM holographic multiplexing technology has gained the attention of researchers.Traditional multiplexing modes use OAM as the only information carrier,which is prone to crosstalk and low information multiplexing rate.In order to solve the above problems,researchers have improved the orbital angular momentum holographic encryption scheme by combining the OAM with other optical dimensions,and the corresponding research results have been numerous.Thanks to the rapid development of vortex light field modulation technology,more and more intrinsic degrees of freedom of the beam have been exploited,such as notched beams,chiral light fields,and residual optical vortices.Researchers have applied these degrees of freedom to orbital angular momentum holography and achieved remarkable results,greatly enhancing the holographic information capacity and security performance.It is found that the generalized perfect optical vortices modulated by a free-lens phase have holographic preservation and mode selection properties similar to those of the spiral phase,and it is known that this novel and unique modulated phase has not yet been applied to orbital angular momentum holography.In this paper,we propose a multidimensional holographic encryption scheme that combines optical orbital angular momentum a

关 键 词：轨道角动量 复用全息 光场调控 自由透镜 完美光学涡旋 

分 类 号：O438.1[机械工程—光学工程]