超高密度光存储研究进展  

Research Progress of Ultra⁃High Density Optical Storage

作　　者：阮昊[1] 胡巧 赵苗 Ruan Hao;Hu Qiao;Zhao Miao(Photonic Integrated Circuits Center,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海光学精密机械研究所光芯片集成研发中心,上海201800 [2]中国科学院大学,北京100049

出　　处：《中国激光》2024年第11期410-424,共15页Chinese Journal of Lasers

基　　金：国家重点研发计划(2021YFB2802000);上海市科委项目(18DZ1100400)。

摘　　要：当前,全球数据量正处在爆发式增长阶段,为光存储领域带来了巨大的发展机遇。受光学衍射极限的制约,传统光存储技术的密度难以满足海量数据的存储需求。为了提升光存储密度,人们开发了三维空间、偏振、波长等多维信息复用技术,同时,随着纳米技术的发展,现已突破衍射极限实现超分辨纳米信息存储。本文介绍了超高密度光存储领域的发展现状,总结了多维信息复用技术和超分辨光存储技术的代表性研究成果,梳理了不同技术方案可提升存储密度的理论极限。此外,本文还介绍了本课题组基于双光束超分辨光存储技术实现单盘拍比特(Pb)存储量级的最新研究进展,并展望了超高密度光存储面向大数据应用的挑战和发展趋势。Significance With the development of technologies such as artificial intelligence,the metaverse,the digital economy,and quantum computing,global data production is growing dramatically,and the amount of stored information has rapidly jumped from the PB level to the EB level or even the ZB level in extreme cases.According to statistics and predictions from the Statista,the total amount of data generated globally will grow at an annual rate of 27%from 2020 to 2025,and it is expected to reach 2142 ZB by 2035.But major storage devices,such as solid-state drives,hard drives,and magnetic tapes,generally face issues of high energy consumption and short operating lives.Additionally,costs increase sharply with time migration,and there is a risk of data loss.In comparison,optical storage technology is more durable,reliable,and energy-efficient,and it presents a promising green solution for long-term data storage.However,the density of traditional optical storage technology is limited by diffraction,making it difficult to meet the storage requirements of massive data.In order to improve storage density,methods commonly used are shortening the laser wavelength and increasing the numerical aperture(NA)of the objective lens to reduce the size of the recording spot,as demonstrated by the development from CD to BD.By using a recording wavelength of 405 nm and an objective lens with an NA of 0.85,a single BD can achieve a maximum capacity of 500 GB and a storage density of approximately 49.1 Gbit/inch2.Wavelengths below 400 nm result in high costs,while increasing NA reduces the working distance,which will easily damage the lens and optical disc.Therefore,it is necessary to develop new technologies to achieve ultra-high density optical storage.In recent decades,researchers have continuously explored innovative mechanisms for optical storage.By introducing parameters such as 3D space,polarization,and wavelength for multiple information reuse,storage space can be further utilized.In addition,with the development of nanotechnology,s

关 键 词：光数据存储 超高密度 多维信息复用 超分辨光存储技术 

分 类 号：TP333[自动化与计算机技术—计算机系统结构] TN29[自动化与计算机技术—计算机科学与技术]