Author Affiliations
Abstract
1 National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation, Collaborative Innovation Center of Advanced Microstructures, and College of Engineering and Applied Sciences, Nanjing University, Nanjing 210023, China
2 School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China
Cascaded holography coupled with the secret-sharing scheme has recently gained considerable attention due to its enhanced information processing and encryption capabilities. Here, we propose a new holographic iterative algorithm and present the implementation of cascaded liquid crystal (LC) holography for optical encryption. Each LC layer acts as the secret key and can generate a distinct holographic image. By cascading two LC elements, a new holographic image is formed. Additionally, we showcase the dynamic optical encryption achieved by electrically switching LCs with combined electric keys. This work may offer promising applications in optical cryptography, all-optical computing, and data storage.
liquid crystals holography optical encryption 
Chinese Optics Letters
2023, 21(12): 120003
Author Affiliations
Abstract
Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
In light of the powerful light manipulation ability of holographic metasurfaces, optical imaging with wavelength multiplexing and polarization multiplexing is performed in this paper. The metasurface is composed of identical rectangular nanoholes etched in silver film. Three imaging effects, including the in-plane color imaging, three-dimensional wavelength-encrypted imaging, and polarization-multiplexing wavelength-encrypted imaging, are realized. The designed metasurface has compact structure, and the obtained image has lower noise. The simulation and experiment results give the verification. Multiple images, including spatial multiplexing, wavelength multiplexing, and polarization multiplexing, exhibit immense potentialities of metasurfaces, and this work is helpful for expanding the applications of metasurfaces.
metasurface holography optical encryption color imaging 
Chinese Optics Letters
2023, 21(10): 100501
朱宸 1邵正龙 1周英杰 1任佳琪 1[ ... ]汤东亮 1,2,**
作者单位
摘要
1 湖南大学物理与微电子科学学院微纳光电器件及应用教育部重点实验室,湖南 长沙 410082
2 湖南大学粤港澳大湾区创新研究院,广东 广州 511300
液晶作为一种介于液态与结晶态之间的功能性软材料,可以同时表现出液体流动性和晶体的各向异性,被广泛应用于图像显示、集成光电子学、光通信等领域。近年来,由于液晶理论研究的深入及其加工技术的发展,液晶在几何相位、动态可调谐等光场调控方面的优势推动了光学器件的平面化、集成化、智能化和小型化。综述了液晶在光场调控方面的最新应用进展,具体讨论了其对光波振幅、相位、偏振等多维度参数的调控特性,进而探讨了液晶在多功能光学器件和光学加密系统中的应用。
光数据存储 液晶 光场调控 各向异性 几何相位 多功能 光学加密 
中国激光
2023, 50(18): 1813006
作者单位
摘要
暨南大学纳米光子学研究院广东省纳米光学操控重点实验室,广东 广州 511443
信息技术的发展使得信息加密变得日益重要。光学加密作为一种信息加密手段,具有多维度和高并发速度等优势。然而,传统的光学加密方案往往需要复杂和笨重的光学元件,这导致器件难以小型化和便携化,同时也降低了加密效率。超构表面是一种人工设计的二维平面结构,能够在亚波长尺度上实现对光场的灵活调控,为光学加密提供了一个灵活的平台。近年来,基于超构表面的光学加密方法不断涌现,其利用光在输入端和输出端的多维度来增加加密的复杂度和安全性。基于此,根据加密的端口类型,分别从单一输入端、单一输出端以及输入-输出端联合三个方面对这些方法进行了分析和讨论,并对超构表面光学加密的未来发展趋势进行了展望。
光通信 超构表面 光学加密 多维光场 纳米打印 光学全息 输入-输出端口 
中国激光
2023, 50(18): 1813004
Xin Liu 1,2Qian Chen 1,2Jun Zeng 1,2,*Yangjian Cai 1,2,**Chunhao Liang 1,2,***
Author Affiliations
Abstract
1 Shandong Provincial Engineering and Technical Center of Light Manipulation & Shandong Provincial Key Laboratory of Optics and Photonic Devices, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
2 Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China
The optical coherence structures of random optical fields can determine beam propagation behavior, light–matter interactions, etc. Their performance makes a light beam robust against turbulence, scattering, and distortion. Recently, we proposed optical coherence encryption and robust far-field optical imaging techniques. All related applications place a high demand on precision in the experimental measurements of complex optical coherence structures, including their real and imaginary parts. Past studies on these measurements have mainly adopted theoretical mathematical approximations, limited to Gaussian statistic involving speckle statistic (time-consuming), or used complicated and delicate optical systems in the laboratory. In this study, we provide: a robust, convenient, and fast protocol to measure the optical coherence structures of random optical fields via generalized Arago (or Poisson) spot experiments with rigorous mathematical solutions. Our proposal only requires to capture the intensity thrice, and is applicable to any optical coherence structures, regardless of their type or optical statistics. The theoretical and experimental results demonstrated that the real and imaginary parts of the structures could be simultaneously recovered with high precision. We believe that such a protocol can be widely employed in phase measurement, optical imaging, and image transfer.
optical coherence statistical optics Arago spot optical encryption optical imaging 
Opto-Electronic Science
2023, 2(2): 220024
胡涛 1,2孙雪茹 1,2金伟民 1,2,*
作者单位
摘要
1 浙江师范大学 物理与电子信息工程学院 信息光学研究所,浙江金华32004
2 浙江省光信息检测与显示技术研究重点实验室,浙江金华31004
为了拓展对计算全息加密图像的解密方法,针对非法攻击难度大的对称-非对称混合加密系统,提出了一种利用神经网络恢复混沌虹膜相位掩模计算全息加密图像的方案。对明文图像进行加密,生成计算全息的密文图像,制作大量的密文明文图像对作为数据集。通过搭建神经网络不断地训练和测试,训练完成后的神经网络可以拟合出密文图像到明文图像的映射关系,解密时不再使用公钥和私钥对密文图像进行解密。实验结果表明:通过神经网络恢复出的图像与明文图像相比,平均互相关系数为0.984,平均峰值信噪比为61.0 dB,平均结构相似性为0.77;对密文图像进行噪声污染,也可以恢复出较高质量的图像,实现了通过神经网络对密文图像解密的目的,方案是可行的并具有较好的鲁棒性。
计算全息 光学加密 深度学习 生物密码 混沌 残差网络 computational holography optical encryption deep learning biological cryptography chaos residual network 
光学 精密工程
2023, 31(3): 417
Author Affiliations
Abstract
1 Electronic Information School, Wuhan University, Wuhan 430072, China
2 Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
3 Peng Cheng Laboratory, Shenzhen 518055, China
4 Wuhan Institute of Quantum Technology, Wuhan 430206, China
For a conventional cascaded metasurface, the combination channel and each single channel are mutually dependent because the phase modulation of a cascaded metasurface is the sum of each single one. Here we propose a cascaded metasurface that can independently encode information into multiple channels. Based on the orientation degeneracy of anisotropic metasurfaces, each single metasurface can produce a quick-response (QR) image in the near field, governed by the Malus law, while the combined channel can produce a holographic image in the far field, governed by geometric phase. The independent and physically separated trichannel design makes information encryption safer.
cascaded metasurfaces optical encryption holography nanoprinting 
Chinese Optics Letters
2023, 21(2): 020003
作者单位
摘要
中国人民解放军61932部队, 北京 100166
基于矢量分解及双随机相位编码设计了一种光学图像加密系统。通过矢量分解将原始图像分解为两个相位模板, 其中一个相位模板通过双随机相位编码系统进行加密, 另一个相位模板作为额外的密钥, 参与图像的解密, 通过与解密光束相干叠加恢复出原始图像。数值模拟表明, 所设计加密系统具有较好的加密和解密效果, 以及较强的抗噪声和剪切攻击能力。相较于双随机编码系统, 文中加密系统通过矢量分解增加了一个密钥, 拓展了系统密钥空间, 且矢量分解破坏了加密系统的线性关系, 加密系统能够抵御唯密文攻击、已知明文攻击及选择明文攻击, 具有较高的安全性。
光学加密 矢量分解 双随机相位编码 密钥空间 Optical encryption Vector decomposition Double random phase encoding Key space 
光散射学报
2022, 34(3): 237
作者单位
摘要
1 重庆邮电大学 通信与信息工程学院, 重庆 400065
2 东北大学 计算机科学与工程学院, 沈阳 110819
针对目前光网络物理层面临的窃听安全问题, 文章提出了一种基于高非线性光纤(HNLF)和超结构光纤布拉格光栅(SSFBG)新的混合光加密方案。方案中采用简并四波混频(FWM)效应对用户信息进行加解密, 并采用光编码技术对密钥信息进行编解码, 编码的同时实现了密钥信号的隐匿传输。通过对比信道中传输的加密信号波形和原始发送信号波形衡量系统的安全性, 并通过系统接收端误码率来衡量系统的有效性。仿真结果表明, 使用了文章所提新的混合光加密方案后, 用户数据信息的频率和相位发生扰乱, 编码后的密钥信号光功率低至-34.4 dBm, 因此窃听信道既无法得到有效数据信息, 也检测不到密钥信号, 从而实现了正交相移键控(QPSK)信号的安全传输。
光加密 光编码 隐匿传输 高非线性光纤 超结构光纤布拉格光栅 optical encryption optical coding hidden transmission HNLF SSFBG 
光通信研究
2022, 48(3): 7
吴军 1,*王刚 1徐刚 2,**
作者单位
摘要
1 桂林电子科技大学电子工程与自动化学院, 广西 桂林 541000
2 中国科学院宁波材料技术与工程研究所, 浙江 宁波 315201
针对现有彩色图像光学加密方法存在解密结果失真的问题,提出一种结合混沌运算与菲涅耳衍射全息的彩色图像单通道加密新方法。首次加密操作利用菲涅耳衍射将彩色图像RGB通道分量转换成一幅实值计算全息图;第二次加密操作是利用改造的Logistic混沌系统对计算全息图像素进行置换与扩散。结果表明,本文方法除传统混沌系统密钥以外,菲涅耳衍射距离、参考光波长和入射角方向余弦作为关键密钥均可以增大密钥空间(约为10 249),而且具有较小的密钥体积;解密图像的保真度高且相邻像素相关性、信息熵、像素数改变率和归一化改变强度等评价指标均接近理想值;密文图像的直方图平坦,灰度分布均匀,完全隐藏了原始彩色图像的灰度和色彩信息。
全息 彩色图像加密 光学加密 计算全息 混沌 
光学学报
2021, 41(19): 1909001

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