Optical three-dimensional(3D)measurement is a critical tool in micro-nano manufacturing,the automotive industry,and medical technology due to its nondestructive nature,high precision,and sensitivity.However,passive li...Optical three-dimensional(3D)measurement is a critical tool in micro-nano manufacturing,the automotive industry,and medical technology due to its nondestructive nature,high precision,and sensitivity.However,passive light field system still requires a refractive primary lens to collect light of the scene,and structured light can not work well with the highly refractive object.Meta-optics,known for being lightweight,compact,and easily integrable,has enabled advancements in passive metalens-array light fields and active structured light techniques.Here,we propose and experimentally validate a novel 3D measurement metasystem.It features a transmitting metasurface generating chromatic line focuses as depth markers and a symmetrically arranged receiving metasurface collecting depth-dependent spectral responses.A lightweight,physically interpretable algorithm processes these data to yield high-precision depth information efficiently.Experiments on metallic and wafer materials demonstrate a depth accuracy of±20μm and lateral accuracy of±10μm.This single-layer optical metasystem,characterized by simplicity,micro-level accuracy,easy installation and scalability,shows potential for diverse applications,including process control,surface morphology analysis,and production measurement.展开更多
Flexible electromagnetic metamaterials are a potential candidate for the ideal material for electromagnetic control due to their unique physical properties and structure.Flexible electromagnetic metamaterials can be d...Flexible electromagnetic metamaterials are a potential candidate for the ideal material for electromagnetic control due to their unique physical properties and structure.Flexible electromagnetic metamaterials can be designed to exhibit specific responses to electromagnetic waves within a particular frequency range.Research shows that flexible electromagnetic metamaterials exhibit significant electromagnetic control characteristics in microwave,terahertz,infrared and other frequency bands.It has a wide range of applications in the fields of electromagnetic wave absorption and stealth,antennas and microwave devices,communication information and other fields.In this review,the currently popular fabrication methods of flexible electromagnetic metamaterials are first summarized,highlighting the electromagnetic modulation capability in different frequency bands.Then,the applications of flexible electromagnetic metamaterials in four aspects,namely electromagnetic stealth,temperature modulation,electromagnetic shielding,and wearable sensors,are elaborated and summarized in detail.In addition,this review also discusses the shortcomings and limitations of flexible electromagnetic metamaterials for electromagnetic control.Finally,the conclusion and perspective of the electromagnetic properties of flexible electromagnetic metamaterials are presented.展开更多
基金financial supports from the National Key R&D Program of China (2021YFA1401200)Beijing Outstanding Young Scientist Program (BJJWZYJH01201910007022)+1 种基金National Natural Science Foundation of China (No. U21A20140, No. 92050117, No. 62105024) programBeijing Natural Science Foundation (JQ24028)
文摘Optical three-dimensional(3D)measurement is a critical tool in micro-nano manufacturing,the automotive industry,and medical technology due to its nondestructive nature,high precision,and sensitivity.However,passive light field system still requires a refractive primary lens to collect light of the scene,and structured light can not work well with the highly refractive object.Meta-optics,known for being lightweight,compact,and easily integrable,has enabled advancements in passive metalens-array light fields and active structured light techniques.Here,we propose and experimentally validate a novel 3D measurement metasystem.It features a transmitting metasurface generating chromatic line focuses as depth markers and a symmetrically arranged receiving metasurface collecting depth-dependent spectral responses.A lightweight,physically interpretable algorithm processes these data to yield high-precision depth information efficiently.Experiments on metallic and wafer materials demonstrate a depth accuracy of±20μm and lateral accuracy of±10μm.This single-layer optical metasystem,characterized by simplicity,micro-level accuracy,easy installation and scalability,shows potential for diverse applications,including process control,surface morphology analysis,and production measurement.
基金funded by the National Natural Science Foundation of China(No.62204020)the Beijing Municipal Education Commission Scientific Research Project(No.KM202211232016)+1 种基金the Beijing Outstanding Young Scientist Program(No.JWZQ20240101028)the China Association for Science and Technology Young Outstanding Scientists Funding Program(No.YESS20210023)。
文摘Flexible electromagnetic metamaterials are a potential candidate for the ideal material for electromagnetic control due to their unique physical properties and structure.Flexible electromagnetic metamaterials can be designed to exhibit specific responses to electromagnetic waves within a particular frequency range.Research shows that flexible electromagnetic metamaterials exhibit significant electromagnetic control characteristics in microwave,terahertz,infrared and other frequency bands.It has a wide range of applications in the fields of electromagnetic wave absorption and stealth,antennas and microwave devices,communication information and other fields.In this review,the currently popular fabrication methods of flexible electromagnetic metamaterials are first summarized,highlighting the electromagnetic modulation capability in different frequency bands.Then,the applications of flexible electromagnetic metamaterials in four aspects,namely electromagnetic stealth,temperature modulation,electromagnetic shielding,and wearable sensors,are elaborated and summarized in detail.In addition,this review also discusses the shortcomings and limitations of flexible electromagnetic metamaterials for electromagnetic control.Finally,the conclusion and perspective of the electromagnetic properties of flexible electromagnetic metamaterials are presented.
