We introduce an idea of producing an optical lattice relied on the Talbot effect. Our alternative scheme is based on the interference of light behind a diffraction grating in the near-field regime. We demonstrate 1D a...We introduce an idea of producing an optical lattice relied on the Talbot effect. Our alternative scheme is based on the interference of light behind a diffraction grating in the near-field regime. We demonstrate 1D and 2D optical lattices with the simulations and experiments. This Talbot optical lattice can be broadly used from quantum simulations to quantum information. The Talbot effect is usually used in lensless optical systems, therefore it provides small aberrations.展开更多
Lateral photovoltaic （LPV） effects are observed in Bi2Sr2Co2Oy （BSCO） thin fihns. Upon illumination of a 532-111n constant laser, the lateral photovoltage is observed to vary linearly with tile laser position betw...Lateral photovoltaic （LPV） effects are observed in Bi2Sr2Co2Oy （BSCO） thin fihns. Upon illumination of a 532-111n constant laser, the lateral photovoltage is observed to vary linearly with tile laser position between two electrodes on tile film surface, and the position sensitivity can be enhmlced by coating a layer of graphite on the surface of the BSCO film as a light absorber. Results suggest that the LPV effect ill the thin fihn is independent of the photo-generated carriers but originates from thermoelectric effects. The present work demonstrates a potential application of BSCO films in position-sensitive photo （thermal） detectors.展开更多
The size effects of microstructure of lattice materials on structural analysis and minimum weight design are studied with extented multiscale finite element method（EMsFEM） in the paper. With the same volume of base ...The size effects of microstructure of lattice materials on structural analysis and minimum weight design are studied with extented multiscale finite element method（EMsFEM） in the paper. With the same volume of base material and configuration, the structural displacement and maximum axial stress of micro-rod of lattice structures with different sizes of microstructure are analyzed and compared.It is pointed out that different from the traditional mathematical homogenization method, EMsFEM is suitable for analyzing the structures which is constituted with lattice materials and composed of quantities of finite-sized micro-rods.The minimum weight design of structures composed of lattice material is studied with downscaling calculation of EMsFEM under stress constraints of micro-rods. The optimal design results show that the weight of the structure increases with the decrease of the size of basic sub-unit cells. The paper presents a new approach for analysis and optimization of lattice materials in complex engineering constructions.展开更多
基金the office of the higher education commissionthe Thailand research fund(TRF)+3 种基金Faculty of Science,Burapha university under contract number MRG5380264the National Electronics and Computer Technology CenterNational Science and Technology Development Agency and Industry/University Cooperative Research Center(I/UCRC)in HDD Componentthe Faculty of Engineering,Khon Kaen University
文摘We introduce an idea of producing an optical lattice relied on the Talbot effect. Our alternative scheme is based on the interference of light behind a diffraction grating in the near-field regime. We demonstrate 1D and 2D optical lattices with the simulations and experiments. This Talbot optical lattice can be broadly used from quantum simulations to quantum information. The Talbot effect is usually used in lensless optical systems, therefore it provides small aberrations.
基金supported by the National"973"Program of China(No.2011CB612305)the National Natural Science Foundation of China(No.51372064)+1 种基金the Nature Science Foundation for Distinguished Young Scholars of Hebei Province,China(No.2013201249)the Science and Technology Research Projects of Collegesand Universities in Hebei Province(No.QN20131040)
文摘Lateral photovoltaic （LPV） effects are observed in Bi2Sr2Co2Oy （BSCO） thin fihns. Upon illumination of a 532-111n constant laser, the lateral photovoltage is observed to vary linearly with tile laser position between two electrodes on tile film surface, and the position sensitivity can be enhmlced by coating a layer of graphite on the surface of the BSCO film as a light absorber. Results suggest that the LPV effect ill the thin fihn is independent of the photo-generated carriers but originates from thermoelectric effects. The present work demonstrates a potential application of BSCO films in position-sensitive photo （thermal） detectors.
基金supported by the National Natural Science Foundation of China(11372060,10902018,91216201,and 11326005)the National Basic Research Program of China(2011CB610304)the Major National Science and Technology Project(2011ZX02403-002)
文摘The size effects of microstructure of lattice materials on structural analysis and minimum weight design are studied with extented multiscale finite element method（EMsFEM） in the paper. With the same volume of base material and configuration, the structural displacement and maximum axial stress of micro-rod of lattice structures with different sizes of microstructure are analyzed and compared.It is pointed out that different from the traditional mathematical homogenization method, EMsFEM is suitable for analyzing the structures which is constituted with lattice materials and composed of quantities of finite-sized micro-rods.The minimum weight design of structures composed of lattice material is studied with downscaling calculation of EMsFEM under stress constraints of micro-rods. The optimal design results show that the weight of the structure increases with the decrease of the size of basic sub-unit cells. The paper presents a new approach for analysis and optimization of lattice materials in complex engineering constructions.
