Micro channel of T2 copper were molding through electronic-magnetic forming experiments.Laser scanning confocal microscope and contourgraph were used to measure the section profile and sheet thickness.The effects of v...Micro channel of T2 copper were molding through electronic-magnetic forming experiments.Laser scanning confocal microscope and contourgraph were used to measure the section profile and sheet thickness.The effects of voltage,shape of channel and discharge cycles on laws of metal flow were studied.Results showed that forming depth of micro channel and thinning of sheet thickness increased as the increasing of the voltage.Mold-filling capacity of components formed by two molds with different structures had been increased when the voltage was increased.Mold with semicircle structure facilitate the material flow and the forming depth of parts was relative large.Semicircle structure was better than taper structure in mold-filling capacity.A number of small pulse discharges can improve the forming quality and deformation,but local thinning in sheet metal leads to non-uniform distribution of thickness.展开更多
Electromagnetic(EM)metamaterials represent a cutting-edge field that achieves anomalously macroscopic properties through artificial design and arrangement of microstructure arrays to freely manipulate EM fields and wa...Electromagnetic(EM)metamaterials represent a cutting-edge field that achieves anomalously macroscopic properties through artificial design and arrangement of microstructure arrays to freely manipulate EM fields and waves in desired ways.The unit cell of a microstructure array is also called a meta-atom,which can construct effective medium parameters that do not exist in traditional materials or are difficult to realize with traditional technologies.By deep integration with digital information,the meta-atom is evolved to a digital meta-atom,leading to the emergence of information metamaterials.Information metamaterials break the inherent barriers between the EM and digital domains,providing a physical platform for controlling EM waves and modulating digital information simultaneously.The concepts of meta-atoms and metamaterials are also introduced to high-frequency integrated circuit designs to address issues that cannot be solved by traditional methods,since lumped-parameter models become unsustainable at microscopic scales.By incorporating several meta-atoms to form a metachip,precise manipulation of the EM field distribution can be achieved at microscopic scales.In this perspective,we summarize the physical connotations and main classifications of meta-atoms and briefly discuss their future development trends.Through this article,we hope to draw more research attention to explore the potential values of meta-atoms,thereby opening up a broader stage for the in-depth development of metamaterials.展开更多
High-aspect-ratio structures with heights or depths significantly exceeding their lateral dimensions hold broad application potential across various fields.The production of these structures is challenging,requiring m...High-aspect-ratio structures with heights or depths significantly exceeding their lateral dimensions hold broad application potential across various fields.The production of these structures is challenging,requiring meticulous control over materials,scale,and precision.We introduce an economical and efficient approach for fabricating high-aspect-ratio nanostructures using a two-photon polymerization process.This approach achieves feature sizes of around 37 nm with an aspect ratio of 10:1 using commercial photoresists.Offering advantages over traditional techniques,our approach simplifies operation and enhances design flexibility,facilitating the creation of smaller,more complex,and high-aspect-ratio structures.The capabilities of this approach are demonstrated by producing arrays of three-dimensional microstructures that exhibit sub-micron scales,extensive periodicity,and pronounced aspect ratios.These developments open new possibilities for applications in biomedical,precision engineering,and optical microdevice manufacturing.展开更多
基金Item Sponsored by the National Natural Science Foundation of China[No.5083500250805035]
文摘Micro channel of T2 copper were molding through electronic-magnetic forming experiments.Laser scanning confocal microscope and contourgraph were used to measure the section profile and sheet thickness.The effects of voltage,shape of channel and discharge cycles on laws of metal flow were studied.Results showed that forming depth of micro channel and thinning of sheet thickness increased as the increasing of the voltage.Mold-filling capacity of components formed by two molds with different structures had been increased when the voltage was increased.Mold with semicircle structure facilitate the material flow and the forming depth of parts was relative large.Semicircle structure was better than taper structure in mold-filling capacity.A number of small pulse discharges can improve the forming quality and deformation,but local thinning in sheet metal leads to non-uniform distribution of thickness.
基金supported by the Project on Frontier and Interdisciplinary Research Assessment,Academic Divisions of the Chinese Academy of Sciences(Grant No.XK2023XXA001)the National Natural Science Foundation of China(Grant Nos.62422106,62131007,62471109,and 62288101).
文摘Electromagnetic(EM)metamaterials represent a cutting-edge field that achieves anomalously macroscopic properties through artificial design and arrangement of microstructure arrays to freely manipulate EM fields and waves in desired ways.The unit cell of a microstructure array is also called a meta-atom,which can construct effective medium parameters that do not exist in traditional materials or are difficult to realize with traditional technologies.By deep integration with digital information,the meta-atom is evolved to a digital meta-atom,leading to the emergence of information metamaterials.Information metamaterials break the inherent barriers between the EM and digital domains,providing a physical platform for controlling EM waves and modulating digital information simultaneously.The concepts of meta-atoms and metamaterials are also introduced to high-frequency integrated circuit designs to address issues that cannot be solved by traditional methods,since lumped-parameter models become unsustainable at microscopic scales.By incorporating several meta-atoms to form a metachip,precise manipulation of the EM field distribution can be achieved at microscopic scales.In this perspective,we summarize the physical connotations and main classifications of meta-atoms and briefly discuss their future development trends.Through this article,we hope to draw more research attention to explore the potential values of meta-atoms,thereby opening up a broader stage for the in-depth development of metamaterials.
基金supported by the National Natural Science Foundation of China(Nos.92050202 and 12274299)the Science and Technology Commission of Shanghai Municipality(No.22QA1406600)the Natural Science Foundation of Shanghai(No.20ZR1437600).
文摘High-aspect-ratio structures with heights or depths significantly exceeding their lateral dimensions hold broad application potential across various fields.The production of these structures is challenging,requiring meticulous control over materials,scale,and precision.We introduce an economical and efficient approach for fabricating high-aspect-ratio nanostructures using a two-photon polymerization process.This approach achieves feature sizes of around 37 nm with an aspect ratio of 10:1 using commercial photoresists.Offering advantages over traditional techniques,our approach simplifies operation and enhances design flexibility,facilitating the creation of smaller,more complex,and high-aspect-ratio structures.The capabilities of this approach are demonstrated by producing arrays of three-dimensional microstructures that exhibit sub-micron scales,extensive periodicity,and pronounced aspect ratios.These developments open new possibilities for applications in biomedical,precision engineering,and optical microdevice manufacturing.
