面向光信息存储的小尺寸光场研究进展  

Small Size Optical Field Advancements for Optical Information Storage

作　　者：郑鹏程 谢向生 梁浩文 周建英 Zheng Pengcheng;Xie Xiangsheng;Liang Haowen;Zhou Jianying(State Key Laboratory of Optoelectronic Materials and Technologies,School of Physics and Astronomy,School of Physics,Sun Yat-Sen University,Guangzhou 510275,Guangdong,China;Department of Physics,College of Science,Shantou University,Shantou 515063,Guangdong,China)

机构地区：[1]光电材料与技术国家重点实验室,中山大学物理与天文学院,中山大学物理学院,广东广州510275 [2]汕头大学理学院物理系,广东汕头515063

出　　处：《中国激光》2023年第18期167-187,共21页Chinese Journal of Lasers

基　　金：广东省基础与应用基础重大项目(2020B0301030009);广东省基础与应用基础研究基金(2021A1515012050);国家自然科学基金(12074444)。

摘　　要：人类社会正处于信息爆炸的大数据时代,迅速膨胀的数据在持续高速增加,需要越来越大的存储容量来承载。高密度光存储技术具有非接触、抗电磁干扰、存储密度高等优点,为更好地存储、处理、分析每天产生的海量数据提供了优质方案。然而,光储存记录点的尺寸受到衍射极限的限制,传统光存储技术的存储密度难以大幅提升。近年来,随着多参量光场调控技术的发展,高数值孔径物镜聚焦下的结构化光场有了更新颖的结构、更丰富的维度和更小的尺寸,为高密度光存储提供了更多选择。本文将综述光场调控技术在紧聚焦焦场上的最新成果,介绍实现空间紧聚焦焦场的理论设计、模拟、实验、高效生成器件和应用。这些成果将会更好地服务于高密度光存储技术的研究与应用。Significance The big data era has witnessed a significant increase in data volume,necessitating additional storage devices to handle the continuous growth in information.High-density optical storage technology offers advantages such as non-contact operation,resistance to electromagnetic interference,and high storage density,suggesting an excellent solution for storing,processing,and analyzing big data.However,traditional optical storage technologies encounter limitations regarding storage density improvement owing to the diffraction limit,which restricts the size of recording points.Progress Advancements on the diffraction limit to improve optical storage density represent an important research topic.However,the reported near-field optical storage techniques require evanescent wave detection,which requires precise motion control during optical writing.Additionally,it is difficult to form multi-layer structures,which limits the increase in storage capacity.Recently,the development of multi-parameter optical field modulation technology has enabled the creation of novel small light field structures under the tightly focusing of high numerical aperture objectives.This advancement can be used to generate small sized recording points,which provides new possibilities for achieving high-density optical storage.This study focuses on the latest advancements in optical field modulation technology,particularly in tight focusing.It includes theoretical designs,simulations,experiments,efficient generation devices,and spatial tighter focal field applications.The study highlights the significance of small-sized sub-diffraction focal spots for improving optical storage density.It discusses light field modulation theory,including mathematical descriptions of optical diffraction and the focal spot size limit.Diffraction depictions such as scalar and vectorial diffraction theories,along with the concept of optical super-oscillation,are explored to address the diffraction limit and achieve super-resolution focal spots.Scalar diffract

关 键 词：光数据存储 衍射极限 光场调控 紧聚焦 光学超振荡 超构透镜 

分 类 号：TQ591[化学工程—精细化工]