检索结果-南通市图书馆

Piecewise Linear Weighted Iterative Algorithm for Beam Alignment in Scanning Beam Interference Lithography

Photonic Sensors 2019年第4期9卷 344-355页

作者： Ying SONG Bayanheshig Shuo LI Shan JIANG Wei WANG national engineering research centre for diffraction gratings manufacturing and application Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesJilin 130033China

To obtain a good interference fringe contrast and high fidelity,an automated beam iterative alignment is achieved in scanning beam interference lithography(SBIL).To solve the problem of alignment failure caused by a large beam angle(or position)overshoot exceeding the detector range while also speeding up the convergence,a weighted iterative algorithm using a weight parameter that is changed linearly piecewise is *** changes in the beam angle and position deviation during the alignment process based on different iterative algorithms are compared by experiment and *** results show that the proposed iterative algorithm can be used to suppress the beam angle(or position)overshoot,avoiding alignment failure caused by *** addition,the convergence speed can be effectively *** algorithm proposed can optimize the beam alignment process in SBIL.

关键词： Piecewise linear weighted iterative algorithm beam alignment scanning beam interference lithography(SBIL) overshoot suppression convergence speed

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Enhanced tensile ductility of tungsten microwires via high-density dislocations and reduced grain boundaries

引用

Journal of Materials Science & Technology 2021年第36期95卷 193-202页

作者： Chaoqun Dang Weitong Lin Fanling Meng Hongti Zhang Sufeng Fan Xiaocui Li Ke Cao Haokun Yang Wenzhao Zhou Zhengjie Fan Ji-jung Kai Yang Lu Department of Mechanical engineering City University of Hong KongHong KongChina Department of Materials Science and engineering Southern University of Science and TechnologyShenzhenChina School of Physical Science and Technology ShanghaiTech UniversityShanghaiChina Nano-manufacturing Laboratory(NML) Shenzhen Research InstituteCity University of Hong KongShenzhenChina State Key Laboratory for manufacturing Systems engineering Xi'an Jiaotong UniversityXi'anChina centre for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong KongChina

Despite being strong with many outstanding physical properties,tungsten is inherently brittle at room temperature,restricting its structural and functional applications at small ***,a facile strategy has been adopted,to introduce high-density dislocations while reducing grain boundaries,through electron backscatter diffraction(EBSD)-guided microfabrication of cold-drawn bulk tungsten *** designed tungsten microwire attains an ultralarge uniform tensile elongation of~10.6%,while retains a high yield strength of~2.4 *** situ TEM tensile testing reveals that the large uniform elongation of tungsten microwires originates from the motion of pre-existing high-density dislocations,while the subsequent ductile fracture is attributed to crack-tip plasticity and the inhibition of grain boundary *** work demonstrates the application potential of tungsten microcomponents with superior ductility and workability for micro/nanoscale mechanical,electronic,and energy systems.

关键词： Tungsten Dislocation Grain boundary Ductility In situ TEM Nanomechanics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Bessel-beam-based side-view measurement of seven-core fibre internal core distribution

引用

Light(Advanced manufacturing) 2024年第1期5卷 19-25页

作者： Liuwei Zhan Runze Zhu Hongwei Tong Haogong Feng Kanghu Zhou Fei Xu College of engineering and Applied Sciences and Collaborative Innovation centre of Advanced Microstructures Nanjing UniversityNanjing 210093Jiangsu ProvinceChina

Accurate knowledge of the internal core distribution of multicore fibres(MCFs)is essential,given their widespread application,including in fibre splicing,bundle fan-in/fan-out,mode coupling,writing gratings,and fibre ***,the extensive use of MCFs is restricted by the limited methods available to precisely measure the fibre core distribution,as the measurement accuracy determines the performance of the *** this study,a side-view and nondestructive scheme based on Bessel beam illumination was proposed for measuring the internal core distribution of a seven-core *** beams offer a large focal length in a scattering medium,and exhibit a unique pattern when propagating in an off-axis medium with a spatially varying refractive *** results revealed that a long focal length and unique pattern influence the image contrast in the case of Bessel beams,which differs from a typical Gaussian ***,high-precision measurement of a seven-core fibre core distribution based on a Bessel beam was demonstrated using a digital correlation method.A deep learning approach was used to improve the measurement precision to 0.2°with an accuracy of 96.8%.The proposed side-view Bessel-beam-based method has the potential to handle more complex MCFs and photonic crystal fibres.

关键词： Structured light Bessel beam illumination Internal measurement Nondestructive measurement

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ultrawide-band optically transparent antidiffraction metamaterial absorber with a Thiessen-polygon metal-mesh shielding layer

引用

Photonics research 2023年第7期11卷 1354-1363页

作者： NAITAO SONG QIAO SUN SU XU DONGZHI SHAN YANG TANG XIAOXI TIAN NIANXI XU JINGSONG GAO Key Laboratory of Optical System Advanced manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China College of Da Heng University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Jilin Provincial Key Laboratory of Advanced Optoelectronic Equipment and Instrument manufacturing Technology Changchun 130033China

Transparent absorbers, with a functional integration of broadband electromagnetic shielding, microwave camouflage,and optical transparency, have attracted increasing attention in the past decades. Metal mesh, an artificial, optically transparent, conducting material composed of periodic metallic gratings, is the optimal choice for the microwave shielding layer of transparent absorbers because of its excellent compatibility between high transparency and low resistance. However, the micrometer-level periodicity of metallic grating concentrates the diffraction of light, which degrades the imaging quality of cameras and sensors in common. In this study, we report on a generalized Thiessenpolygon-randomization method that prevents the concentration of the diffraction of light in periodic metallic grating and demonstrate an ultrawide-band optically transparent diffraction-immune metamaterial absorber. The absorber is constructed with a multilayer indium-tin-oxide-based metasurface and a Thiessen-polygon-randomized metal-mesh reflector. The lossy metasurface provides multimode absorption, whereas the Thiessen-polygon randomization prevents the concentration of the diffraction of light. The practical sample achieves a 10 dB absorptivity and shielding effectiveness over a range of 8–26.5 GHz, and the optical transparency is also preserved over the entire visible and near-infrared regions. The point spread function and field of view are both improved by using the antidiffraction absorber. Our study paves the way for the application of optically transparent electromagnetic devices, display, and optoelectronic integration in a more practical stage. ? 2023 Chinese Laser Press.

关键词： absorber transparent polygon

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Controllable generation of large-scale highly regular gratings on Si films

引用

Light(Advanced manufacturing) 2021年第3期2卷 88-96页

作者： Jiao Geng Xiaoguo Fang Lei Zhang Guangnan Yao Liye Xu Fengjiang Liu Weiwei Tang Liping Shi Min Qiu Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake University18 Shilongshan RoadHangzhou 310024Zhejiang ProvinceChina Institute of Advanced Technology Westlake Institute for Advanced Study18 Shilongshan RoadHangzhou 310024Zhejiang ProvinceChina

The application of femtosecond laser-induced periodic surface texturing has significant potential in medicine,optics,tribology,and biology,among other ***,when irradiated by a large intense laser spot,the periodic structures usually exhibit an uncontrollable regularity,forming bifurcated patterns,thus limiting their widespread *** originates from numerous independent branching *** usual solution to this problem is to utilize the quasi-direct laser writing technique,that is,by limiting the laser beam size(diameter ofgratings under stationary irradiation with a large laser spot(diameter>100 wavelengths).Surprisingly,some unconventional complex patterns,such as radial,annular,and spiral gratings,can also be easily produced by structured light fields with unprecedented *** diameters reach up to>500μ***,we can artificially control the initial seeding structure to further improve the regularity of the gratings,defined by dispersion in the ripple orientation angle in their 2D Fourier *** a result,the regularity in our experiments produced by a large laser spot is even higher than that scanned by a tiny *** and highly regular ripples are beneficial to the structural coloring effects because they arise from the light diffraction by subwavelength gratings.

关键词： regularity limiting utilize

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：