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Reprogrammable optical metasurfaces by electromechanical reconfiguration

OPTICS EXPRESS 2021年第19期29卷 30751-30760页

作者： Han, Yu Chen, Shanshan Ji, Changyin Liu, Xing Wang, Yongtian Liu, Juan Li, Jiafang Beijing Inst Technol Beijing Key Lab Nanophoton & Ultrafine Optoelect Key Lab Adv Optoelect Quantum Architecture & Meas Minist Educ Beijing 100081 Peoples R China Beijing Inst Technol Sch Phys Beijing 100081 Peoples R China Beijing Inst Technol Sch Opt & Photon Beijing Engn Res Ctr Mixed Real & Adv Display Beijing 100081 Peoples R China Beijing Inst Technol Yangtze Delta Reg Acad Jiaxing 314019 Peoples R China

Metasurfaces, with artificially designed ultrathin and compact optical elements, enable versatile manipulation of the amplitude, phase, and polarization of light waves. While most of the metasurfaces are static and passive, here we propose a reprogrammable metasurface based on the state-of-art electromechanical nano-kirigami, which allows for independent manipulation of pixels at visible wavelengths through mechanical deformation of the nanostructures. By incorporating electrostatic forces between the top suspended gold nano-architectures and bottom silicon substrate, out-of-plane deformation of each pixel and the associated phase retardation are independently controlled by applying single voltage to variable pixels or exerting programmable voltage distribution on identical pixels. As a proof-of-concept demonstration, the metasurfaces are digitally controlled and a series of tunable metasurface holograms such as 3D dynamic display and ultrathin planar lenses are achieved at visible wavelengths. The proposed electromechanical metasurface provides a new methodology to explore versatile reconfigurable and programmable functionalities that may lead to advances in a variety of applications such as hologram, 3D displays, data storage, spatial light modulations, and information processing. (C) 2021 optical Society of America under the terms of the OSA Open Access Publishing Agreement

关键词： Effective refractive index optical elements Planar lenses Polarization control Spatial light modulators Surface waves

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Preselectable optical Fingerprints of Heterogeneous Upconversion Nanoparticles

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NANO LETTERS 2021年第18期21卷 7659-7668页

作者： Liao, Jiayan Zhou, Jiajia Song, Yiliao Liu, Baolei Chen, Yinghui Wang, Fan Chen, Chaohao Lin, Jun Chen, Xueyuan Lu, Jie Jin, Dayong Univ Technol Sydney Fac Sci Inst Biomed Mat & Devices IBMD Sydney NSW 2007 Australia Univ Technol Sydney Fac Engn & IT Ctr Artificial Intelligence Sydney NSW 2007 Australia Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Rare Earth Resource Utilizat Changchun 130022 Peoples R China Chinese Acad Sci CAS Key Lab Design & Assembly Funct Nanostruct Fuzhou 350002 Fujian Peoples R China Chinese Acad Sci Fujian Key Lab Nanomat Fujian Inst Res Struct Matter Fuzhou 350002 Fujian Peoples R China Southern Univ Sci & Technol UTS SUStech Joint Res Ctr Biomed Mat & Devices Dept Biomed Engn Shenzhen Peoples R China

The control in optical uniformity of single nanoparticles and tuning their diversity in multiple dimensions, dot to dot, holds the key to unlocking nanoscale applications. Here we report that the entire lifetime profile of the single upconversion nanoparticle (tau(2) profile) can be resolved by confocal, wide-field, and super-resolution microscopy techniques. The advances in both spatial and temporal resolutions push the limit of optical multiplexing from microscale to nanoscale. We further demonstrate that the time-domain optical fingerprints can be created by utilizing nanophotonic upconversion schemes, including interfacial energy migration, concentration dependency, energy transfer, and isolation of surface quenchers. We exemplify that three multiple dimensions, including the excitation wavelength, emission color, and tau(2) profile, can be built into the nanoscale derivative tau(2)-dots. Creating a vast library of individually preselectable nanotags opens up a new horizon for diverse applications, spanning from sub-diffraction-limit data storage to high-throughput single-molecule digital assays and super-resolution imaging.

关键词： single upconversion nanoparticles optical fingerprints multiple dimensions lifetime profiles

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Theoretical Investigation of (Zn, Co) co-Doped BaTiO3 for Advanced Energy and Photonic Applications

arXiv

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arXiv 2024年

作者： Kang, Zheng Wu, Mei Feng, Yiyu Li, Jiahao Zhang, Jieming Tian, Haiyi Wang, Ancheng Wu, Yunkai Wang, Xu College of Big Data and Information Engineering Guizhou University Guizhou Guiyang550025 China Department of Mathematics The Chinese University of Hong Kong 999077 Hong Kong Key Laboratory of Advanced Manufacturing Technology Ministry of Education Guizhou Guiyang550025 China

In light of recent advancements in energy technology, there is an urgent need for lead-free barium titanate (BTO) -based materials that exhibit remarkable ferroelectric and photoelectric properties. Notwithstanding the considerable experimental advances, a theoretical understanding from the electron and atomic perspectives remains elusive. This study employs the generalized gradient approximation plane wave pseudopotential technique to investigate the structural, electronic, ferroelectric, and optical properties of (Zn, Co) co-doped BaTiO3 (BZCT) based on density functional theory. The objective is to ascertain the extent of performance enhancement and the underlying mechanism of (Zn, Co) co-doping on barium titanate. Our findings reveal that the incorporation of (Zn, Co) into the BaTiO3 lattice significantly augments the tetragonality of the unit cell. Moreover, the ferroelectric properties are enhanced, with a spontaneous polarization that is stronger than that observed in pure BTO, exhibiting excellent ferroelectricity. The results of the Hubbard+U algorithm indicate that the band gap of BZCT is reduced. Concurrently, the enhanced ferroelectric polarization increases the built-in electric field of the material, facilitating the separation of photogenerated carriers and improving optical absorption. Consequently, the optical absorption ability and photorefractive ability are effectively enhanced. BZCT, with its high spontaneous polarization and outstanding optical properties, can serve as a promising candidate material in the fields of energy storage and photovoltaics. © 2024, CC BY-NC-ND.

关键词： Ferroelectricity

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光学图像压缩加密技术研究进展

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激光与光电子学进展 2023年第4期60卷 1-27页

作者：秦怡满天龙万玉红王兴北京工业大学理学部北京100124 南阳师范学院机电工程学院河南南阳473061

光波作为信息载体具有高速并行处理二维信息的能力及天然优势。光波的波长、振幅、相位、偏振等为光波的调制提供不同的维度和多种可能,也使得光学加密技术和光学密码系统展现出巨大的应用价值。随着加密数据传输量的急剧增长,在进行加... 详细信息

光波作为信息载体具有高速并行处理二维信息的能力及天然优势。光波的波长、振幅、相位、偏振等为光波的调制提供不同的维度和多种可能,也使得光学加密技术和光学密码系统展现出巨大的应用价值。随着加密数据传输量的急剧增长,在进行加密的同时实现信息的压缩变得愈加重要,因为这将缩短处理这些数据所需的时间并有效节约存储空间。提出广义的光学图像压缩加密的概念,并将压缩策略分为明文压缩、密文压缩和明文密文同步压缩。在此基础上,介绍适合每种策略的具体压缩方法,并通过阐述这些压缩方法在一些实例中的应用,综述了光学图像压缩加密技术的研究进展,也对未来的研究方向进行了展望。

关键词：光学信息安全压缩加密图像压缩光信息处理

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Recent advances on Neuromorphic Devices Based on Chalcogenide Phase-Change Materials

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ADVANCED FUNCTIONAL MATERIALS 2020年第50期30卷 2003419-2003419页

作者： Xu, Ming Mai, Xianliang Lin, Jun Zhang, Wei Li, Yi He, Yuhui Tong, Hao Hou, Xiang Zhou, Peng Miao, Xiangshui Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China Xi An Jiao Tong Univ Ctr Adv Mat Performance Nanoscale State Key Lab Mech Behav Mat Xian 710049 Peoples R China Fudan Univ Sch Microelect State Key Lab ASIC & Syst Shanghai 200433 Peoples R China

Traditional von Neumann computing architecture with separated computation and storage units has already impeded the data processing performance and energy efficiency, calling for emerging neuromorphic electronic and optical devices and systems which can mimic the human brain to shift this paradigm. Material-level innovation has become the key component to this revolution of information technology. Chalcogenide phase-change material (PCM) as a well-acknowledged data-storage medium is a promising candidate to tackle this challenge. In this review, the use of PCMs to implement artificial neurons and synapses from both the electronic and optical respects is discussed, and in particular, the structure-property physics and transition dynamics that enable such brain-inspired and in-memory computing applications are emphasized. Recent advances on the atomic-level amorphous and crystalline structures, transition mechanisms, materials optimization and design, neural and synaptic devices, brain-inspired chips, and computing systems, as well as the future opportunities of PCMs, are summarized and discussed.

关键词： artificial neurons artificial synapses memory neurocomputing phase change materials

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液晶的多维度光场调控技术研究进展

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中国激光 2023年第18期50卷 74-95页

作者：朱宸邵正龙周英杰任佳琪樊帆汤东亮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 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... 详细信息

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。

关键词：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

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CsPbX_(3)量子点微晶玻璃的光学性能研究进展

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硅酸盐学报 2022年第4期50卷 1132-1142页

作者：曹恩豪周大成刘营杨勇 Hassan Babeker 王齐邱建备昆明理工大学材料科学与工程学院昆明650093 云南省新材料制备与加工重点实验室昆明650033

CsPbX_(3)(X=Cl,Br,I)量子点微晶玻璃集CsPbX_(3)量子点出众的光学性能和玻璃良好的物化性能于一体,在光学数据存储、随机激光、X射线成像、照明显示、太阳能电池、光催化等领域有重要应用价值。本文概述了其制备加工以及相对应的性能... 详细信息

CsPbX_(3)(X=Cl,Br,I)量子点微晶玻璃集CsPbX_(3)量子点出众的光学性能和玻璃良好的物化性能于一体,在光学数据存储、随机激光、X射线成像、照明显示、太阳能电池、光催化等领域有重要应用价值。本文概述了其制备加工以及相对应的性能应用的最新进展,如利用飞秒激光加工在玻璃中指定区域析出CsPbX_(3)用作光学数据存储,以此刻画其组成-结构-性能之间关系与变化规律。不过,其在未来的研究中仍面临诸多挑战,如CsPbX_(3)在玻璃基质中的原位生长机理并不完全清楚,对CsPbX_(3)前驱体在“玻璃微反应器”中的赋存状态、近邻结构和分布形态的研究将有助于进一步认识CsPbX_(3)在玻璃中的形成机理,为获得光学性能更好的CsPbX_(3)量子点微晶玻璃提供理论指导。

关键词：量子点微晶玻璃玻璃体系玻璃网络拓扑结构钙钛矿析晶光学数据存储

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Rotational Multiplexing Method Based on Cascaded Metasurface Holography

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ADVANCED optical MATERIALS 2022年第8期10卷

作者： Wei, Qunshuo Huang, Lingling Zhao, Ruizhe Geng, Guangzhou Li, Junjie Li, Xiaowei Wang, Yongtian Beijing Inst Technol Sch Opt & Photon Beijing Engn Res Ctr Mixed Real & Adv Display Beijing 100081 Peoples R China Chinese Acad Sci Inst Phys Beijing Natl Lab Condensed Matter Phys Beijing 100190 Peoples R China Beijing Inst Technol Sch Mech Engn Laser Micro Nanofabricat Lab Beijing 100081 Peoples R China

Since the emergence of optical metasurfaces, their outstanding wavefront modulation ability and numerous degrees of freedom (DOFs) have motivated many multiplexing methods, and many unprecedented functionalities and impressive advances have been achieved. However, the number of DOFs of single-layer metasurfaces is intrinsically limited. To further explore the innovative multiplexing dimensions and application scenarios of metasurfaces, multilayer and cascaded metasurfaces are proposed. Inspired by the alignment sensitivity of cascaded metasurface holography, here the authors use the in-plane rotation between two cascaded metasurfaces as an additional design DOF to introduce the concept of the rotational multiplexing method. An iterative gradient optimization scheme based on a machine learning method is developed to obtain the phase profiles. Dual working modes can be achieved, and both single-layer and rotational cascaded holography can be reconstructed in the far-field. Such versatile configurations may provide promising solutions for optical encryption, data storage, and dynamic display.

关键词： cascaded metasurfaces holography optical encryption rotational multiplexing

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Nanocrystal-in-glass composite (NGC): A powerful pathway from nanocrystals to advanced optical materials

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PROGRESS IN MATERIALS SCIENCE 2022年 130卷

作者： Pan, Qiwen Yang, Dandan Dong, Guoping Qiu, Jianrong Yang, Zhongmin South China Univ Technol Sch Mat Sci & Engn State Key Lab Luminescent Mat & Devices Guangdong Prov Key Lab Fiber Laser Mat & Appl Tec Guangzhou 510640 Peoples R China South China Univ Technol Sch Phys & Optoelect Guangzhou 510640 Peoples R China Zhejiang Univ Coll Opt Sci & Engn State Key Lab Modern Opt Instrumentat Hangzhou 310027 Peoples R China

Transparent nanocrystal-in-glass composite (NGC) comprising functional nanocrystals in transparent inorganic glass creates a new bridging from nano/microscale structure to multifunctional macroscale devices with advanced optical properties. In this review, we outline the key scientific advances in the development of transparent NGC, from the perspectives of fundamental design principles, new synthetic strategies and their substantial progress in advanced optical applications. To generate desired transparent NGC materials, we start with the design principles to describe the transformation process from nano/micro to macro, providing an in-depth insight into the structure-property relationship and the underlying problem in particle binding and network reconstruction in the composite materials. Emerging techniques based on the "top-down" or "bottom-up" strategies have advanced the ability to fabricate nanocomposites with controllable composition, phases, fraction, morphology, spatial distribution, and orientation. We also provide an overview of recent advances in optical applications, including solid-state lighting, highperformance lasers, optical data storage, and fluorescence sensing. The remaining scientific challenges, for example, the important trade-off between functional performance and chemical compatibility when bridging the nanocrystals to transparent NGC and their devices, are also highlighted. Addressing these questions will provide a clear pathway to design and manufacture multifunctional inorganic materials based on these NGC materials.

关键词： Nanocrystal-in-glass composite (NGC) Design principles Top-down fabrication Bottom-up fabrication Advanced optical applications

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全息高分子纳米复合材料研究进展

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科学通报 2022年第11期67卷 1023-1035页

作者：王艺璇郝兴天彭海炎周兴平解孝林华中科技大学化学与化工学院能量转换与存储材料化学教育部重点实验室武汉430074

全息高分子纳米复合材料(holographic polymer nanocomposites, HPNC)是基于相干激光聚合诱导相分离原理制备的具有周期性有序结构的高分子纳米复合材料,属于多维度、跨尺度的新概念信息材料.不仅通过微米/亚微米尺度的周期性有序相分... 详细信息

全息高分子纳米复合材料(holographic polymer nanocomposites, HPNC)是基于相干激光聚合诱导相分离原理制备的具有周期性有序结构的高分子纳米复合材料,属于多维度、跨尺度的新概念信息材料.不仅通过微米/亚微米尺度的周期性有序相分离结构存储光波的振幅、相位等全部信息,还通过引入的纳米粒子、液晶、发光分子等存储其他信息,具有信息存储容量大、光调制能力强的特点.在高端防伪、裸眼三维显示、增强现实、高密度数据存储、全息传感等高新技术领域具有重要应用价值.本文重点概述HPNC的高性能化与多功能化研究进展,并展望了HPNC的发展方向.

关键词：纳米复合材料高分子全息防伪三维显示增强现实

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