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Journal of Innovative Optical Health Sciences 2018年第4期11卷 81-91页

作者： Yangchun Deng junlei zhao Yun Dai Yudong Zhang The Key Laboratory on Adaptive Optics Chinese Academy of Sciences Chengdu 610209 P.R.China The Laboratory on Adaptive Optics Institute of Optics and Electronics Chinese Academy of Sciences Chengdu 610209 P.R.China University of Chinese Academy of Sciences Beijing 100049 P.R.China

A simple method to objectively and simultaneously measure eye's longitudinal and transverse chromatic aberrations was proposed.A dual-wavelength wavefront measurement system using two Hartmann-Shack wavefront sensors was *** wavefronts of the red(639.1 nm)and near-infrared(786.0 nm)lights were measured simultaneously for different positions in the model *** chromatic wavefronts were converted into Zernike *** Zernike tilt cofficient(irst term)was used to calculate the transverse chromatic aberration along the ax-direction,while the Zernike defocus coefficient(fourth term)was used to calculate the longi-tudinal chromatic *** measurement and simulation data were consistent.

关键词： Chromatic aberration Hartmann-Shack wavefront sensor simultaneity Zernike coefficient

Complex Ga_(2)O_(3) polymorphs explored by accurate and general-purpose machine-learning interatomic potentials

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npj Computational Materials 2023年第1期9卷 666-675页

作者： junlei zhao Jesper Byggmästar Huan He Kai Nordlund Flyura Djurabekova Mengyuan Hua Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Physics University of HelsinkiP.O.Box 43FI-00014 HelsinkiFinland FCAI:Finnish Center for Artificial Intelligence University of HelsinkiP.O.Box 43FI-00014 HelsinkiFinland School of Nuclear Science and Technology Xi’an Jiaotong UniversityXi’anShaanxi 710049China Helsinki Institute of Physics University of HelsinkiP.O.Box 43FI-00014 HelsinkiFinland

Ga_(2)O_(3) is a wide-band gap semiconductor of emergent importance for applications in electronics and ***,vital information of the properties of complex coexisting Ga_(2)O_(3) polymorphs and low-symmetry disordered structures is *** develop two types of machine-learning Gaussian approximation potentials(ML-GAPs)for Ga_(2)O_(3) with high accuracy forβ/κ/α/δ/γpolymorphs and generality for disordered stoichiometric *** release two versions of interatomic potentials in parallel,namely soapGAP and tabGAP,for high accuracy and exceeding speedup,*** potentials can reproduce the structural properties of all the five polymorphs in an exceptional agreement with ab initio results,meanwhile boost the computational efficiency with 5×102 and 2×105 computing speed increases compared to density functional theory,***,the Ga_(2)O_(3) liquid-solid phase transition proceeds in three different *** experimentally unrevealed complex dynamics can be understood in terms of distinctly different mobilities of O and Ga sublattices in the interfacial layer.

关键词： disordered exceptional exceeding

Density functional theory calculation of the properties of carbon vacancy defects in silicon carbide

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Nanotechnology and Precision Engineering 2020年第4期3卷 211-217页

作者： XiuhongWang junlei zhao Zongwei Xu Flyura Djurabekova Mathias Rommel Ying Song Fengzhou Fanga State Key Laboratory of Precision Measuring Technology&Instruments Centre of MicroNano Manufacturing TechnologyTianjin UniversityTianjin 300072China Department of Physics and Helsinki Institute of Physics University of HelsinkiP.O.Box 43FI-00014 HelsinkiFinland Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China Fraunhofer Institute for Integrated Systems and Device Technology IISB Schottkystrasse 1091058 ErlangenGermany

As a promisingmaterial for quantumtechnology,silicon carbide(SiC)has attracted great interest inmaterials *** vacancy is a dominant defect in ***,understanding the properties of this defect is critical to its application,and the atomic and electronic structures of the defects needs to be *** this study,density functional theorywas used to characterize the carbon vacancy defects in hexagonal(h)and cubic(k)lattice *** zero-phonon line energies,hyperfine tensors,and formation energies of carbon vacancies with different charge states(2−,−,0,+and 2+)in different supercells(72,128,400 and 576 atoms)were calculated using standard Perdew-Burke-Ernzerhof and Heyd-Scuseria-Ernzerhof *** show that the zero-phonon line energies of carbon vacancy defects are much lower than those of divacancy defects,indicating that the former is more likely to reach the excited state than the *** hyperfine tensors of VC+(h)and VC+(k)were *** of the calculated hyperfine tensor with the experimental results indicates the existence of carbon vacancies in SiC *** calculation of formation energy shows that the most stable carbon vacancy defects in the material are VC 2+(k),VC+(k),VC(k),VC−(k)and VC 2−(k)as the electronic chemical potential increases.

关键词： Density functional theory Silicon carbide Carbon vacancy

Angular dependence of nanoparticle generation in the matrix assembly cluster source

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Nano Research 2019年第12期12卷 3069-3074页

作者： Maria Chiara Spadaro junlei zhao William D.Terry Jian Liu Feng Yin Flyura Djurabekova Richard E.Palmer College of Engineering Swansea UniversityBay CampusFabian WaySwansea SAI 8ENUK Department of Physics and Helsinki Institute of Physics University of HelsinkiP.O.Box43f FIN-00014HelsinkiFinland Nanoscale Physics Research Laboratory School of Physics and AstronomyUniversity of BirminghamBirmingham B152TTUK National Center for Electron Microscopy in Beijing Key Laboratory cf Advanced Materials(MOE)The State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Physics and Information Technology Shaanxi Normal UniversityXian 710062China Catalan Institute of Nanoscience and Nanotechnology(ICN2) CSIC and BISTCampus UABBellaterra08193 BarcelonaCataloniaSpain

The matrix assembly cluster source(MACS)represents a bridge between conventional instruments for cluster beam deposition(CBD)and thelevel of industrial *** method is based on Ar^+ion sputtering of a pre-condensed Ar-M matrix(where M,is typically a metal such asAg).Each Ar^+ion produces a collision cascade and thus the formation of metal clusters is in the matrix,which are then sputtered *** wepresent an experimental and computational investigation of the cluster emission process,specifically its dependence on the Ar^+ion angle of in cidence and the cluster emission *** find the in cide nee angle strongly in flue nces the emerging cluster flux,which is assigned to thespatial location of the deposited primary ion energy relative to the cluster into the *** also found an approximately constant anglebetween the incident ion beam and the peak in the emitted cluster distribution,with value between 99°and 109°.

关键词： cluster beam deposition scale-up nano particles silver ligand-free green synthesis

Improving iconic memory through contrast detection training with HOA-corrected vision

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Fundamental Research 2024年第1期4卷 95-102页

作者： Ling Gong junlei zhao Yun Dai Zili Wang Fang Hou Yudong Zhang Zhong-Lin Lu Jiawei Zhou State Key Laboratory of Ophthalmology Optometry and Vision ScienceEye HospitalSchool of Ophthalmology and OptometryWenzhou Medical UniversityWenzhou 325027China Institute of Optics and Electronics Chinese Academy of SciencesChengdu 610209China The Key Laboratory of Adaptive Optics Chinese Academy of SciencesChengdu 610209China Chengdu University of Traditional Chinese Medicine Chengdu 610075China Division of Arts and Sciences New York University ShanghaiShanghai 200126China Center for Neural Science Department of PsychologyNew York UniversityNew York 10003United States NYU-ECNU Institute of Brain and Cognitive Science at NYU Shanghai Shanghai 200062China

Iconic memory and short-term memory are not only crucial for perception and cognition,but also of great importance to mental ***,we first showed that both types of memory could be improved by improving limiting processes in visual processing through perceptual *** adults were trained in a contrast detection task for ten days,with their higher-order aberrations(HOA)corrected in *** found that the training improved not only their contrast sensitivity function(CSF),but also their iconic memory and baseline information maintenance for short-term memory,and the relationship between memory and CSF improvements could be well-predicted by an observer *** results suggest that training the limiting component of a cognitive task with visual perceptual learning could improve visual *** may also provide an empirical foundation for new therapies to treat people with poor sensory memory.

关键词： Perceptual learning Iconic memory Higher-order aberrations Contrast sensitivity Short-term memory

Objective quantification of chromatic aberration across the visual field of the human eye

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Chinese Optics Letters 2018年第11期16卷 70-74页

作者： Yangchun Deng junlei zhao Yun Dai Yudong Zhan Key Laboratory on Adaptive Optics Chinese Academy of SciencesChengdu 610209China Laboratory on Adaptive Optics Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China University of Chinese Academy of Sciences Beijing 100049China Corresponding author：daiyunqq@*** corresponding author：ydzhang@***

A simple and straightforward method to objectively measure the transverse chromatic aberration （TCA） at horiq zontal field angles out to ±10° from the visual axis of the human eye was proposed. Longitudinal chromatic abetration （LCA） was also measured across the visual field. The TCA of a human eye was obtained by deviation of the point spread function （PSF） images. LCA was calculated from the Zernike defocus. The average TCA changing with eccentricity was 0.162 arcmin/degree between 639 nm and 795 nm wavelengths. Near the optic axis of the eye, the average LCA was 0.37 ± 0.02 D, and it increased slightly with eccentricity （up to 0.54 ± 0.02 D）.

关键词： Point spread function

Point-defect-driven flattened polar phonon bands in fluorite ferroelectrics

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npj Computational Materials 2023年第1期9卷 1120-1128页

作者： Pu Ai Fengjun Yan Wen Dong Shi Liu junlei zhao Kan-Hao Xue Syed Ul Hasnain Bakhtiar Yilong Liu Qi Ma Ling Miao Mengyuan Hua Guangzu Zhang Shenglin Jiang Wei Luo Qiuyun Fu School of Integrated Circuits Engineering Research Centre for Functional Ceramics of the Ministry of Education&Wuhan National Lab for Optoelectronics&Optical Valley Laboratory Huazhong University of Science and Technology430074 WuhanChina Department of Physics School of ScienceWestlake UniversityHangzhou310024 ZhejiangChina School of Optical and Electronic Information Research Centre&Wuhan National Lab for Optoelectronics&Optical Valley Laboratory Huazhong University of Science and Technology430074 WuhanChina Department of Electrical and Electronic Engineering Southern University of Science and Technology518055 ShenzhenChina Shenzhen Huazhong University of Science and Technology Research Institute 518000 ShenzhenP.R.China

The scale-free ferroelectric polarization of fluorite MO_(2)(M=Hf,Zr)due to flat polar phonon bands are promising for nonvolatile *** are also widely introduced to improve the emergent ***,their roles are still not fully understood at the ***,we report a significant effect of point-defect-driven flattening of polar phonon bands with more polar modes and polarization contribution in doped MO_(2).The polar phonon bands in La-doped MO_(2)(M=Hf,Zr)can be significantly flattened,compared with pure ***,the lower energy barrier with larger polarization of VO-only doped MO_(2) compared with La-doped cases suggest that VO and local lattice distortion should be balanced for high-performance fluorite *** work is believed to bridge the relation between point defects and the generally enhanced induced ferroelectricity in fluorite ferroelectrics at the atomic-level and inspire their further property optimization via defect-engineering.

关键词： bands phonon ferroelectric

Objective visual performance evaluation with visual evoked potential measurements based on an adaptive optics system

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Chinese Optics Letters 2018年第5期16卷 82-86页

作者： Yanrong Yang junlei zhao Haoxin zhao Fei Xiao Jiaxin Xie Wiejun Liu Yun Dai Key Laboratory on Adaptive Optics Chinese Academy of Sciences Chengdu 610209 China Laboratory on Adaptive Optics Institute of Optics and Electronics Chinese Academy of Sciences Chengdu 610209 China University of Chinese Academy of Sciences Beijing 100049 China School of Life Science and Technology University of Electronic Science and Technology of China Chengdu 610054 China

An objective visual performance evaluation with visual evoked potential （VEP） measurements was first inte- grated into an adaptive optics （AO） system. The optical and neural limits to vision can be bypassed through this system. Visual performance can be measured electrophysiologically with VEP, which reflects the objective func- tion from the retina to the primary visual cortex. The VEP ts without and with AO correction were preliminarily carried out using this system, demonstrating the great potential of this system in the objective visual performance evaluation. The new system will provide the necessary technique and equipment support for the further study of human visual function.

关键词： VEP AO Objective visual performance evaluation with visual evoked potential measurements based on an adaptive optics system PSF

患有青光眼或糖尿病的中国人眼像差特性统计分析

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光学学报 2015年第A01期35卷 443-451页

作者：肖飞戴云赵军磊赵豪欣张雨东中国科学院光电技术研究所四川成都610209 中国科学院自适应光学重点实验室四川成都610209 中国科学院大学北京100049

由于人眼像差的多样性和不确定性，自适应光学在活体人眼视网膜高分辨率成像临床应用中受到了限制。对患有青光眼或糖尿病的中国人眼像差数据进行统计分析，并在此基础上分析了人眼像差对成像质量的影响及对波前校正器的性能需求。分析... 详细信息

由于人眼像差的多样性和不确定性，自适应光学在活体人眼视网膜高分辨率成像临床应用中受到了限制。对患有青光眼或糖尿病的中国人眼像差数据进行统计分析，并在此基础上分析了人眼像差对成像质量的影响及对波前校正器的性能需求。分析结果表明青光眼和糖尿病患者的人眼高阶像差分别是正常人眼高阶像差的2．9和1．8倍，为了获得接近衍射极限分辨率的视网膜图像，对这两类病眼的像差校正均应该高于8阶泽尼克多项式，并且波前校正器的行程需要分别达到39μm和14μm以上。分析结果对基于自适应光学的临床眼科仪器开发有一定的指导意义。

关键词：自适应光学人眼像差波前校正视网膜成像

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基于控制信号重置的双变形镜人眼视网膜成像

光学学报 2015年第A01期35卷 40-46页

作者：肖飞赵军磊赵豪欣戴云张雨东中国科学院光电技术研究所自适应光学重点实验室四川成都610209 中国科学院大学北京100049

结合人眼自适应光学系统中无需复原Zernike模式系数的特性，提出基于控制信号重置的双变形镜并行控制的改进算法，改进后的算法可以减少矩阵运算量，并能相应地减少存储空间，使其适宜于人眼自适应光学系统的工作特性。对控制算法进行... 详细信息

结合人眼自适应光学系统中无需复原Zernike模式系数的特性，提出基于控制信号重置的双变形镜并行控制的改进算法，改进后的算法可以减少矩阵运算量，并能相应地减少存储空间，使其适宜于人眼自适应光学系统的工作特性。对控制算法进行理论介绍，通过模拟仿真证明其可行性，并将算法应用于双变形镜人眼视网膜高分辨率成像系统，实现了对双变形镜的快速稳定控制，获得了眼底视网膜高分辨率图像。模拟仿真和实验结果表明，该算法能够有效地补偿相伴畸变和抑制两个变形镜之间的耦合。

关键词：自适应光学双变形镜并行控制视网膜成像