Thermal expander metadevices can yield a large uniform temperature field powered by a linear heat source.Previous design of thermal expander metadevices can be regarded as a combination of achieved thermal cloaks and ...Thermal expander metadevices can yield a large uniform temperature field powered by a linear heat source.Previous design of thermal expander metadevices can be regarded as a combination of achieved thermal cloaks and their background materials.However,these thermal-cloak-inspired expander metadevices have an inherent flaw,i.e.,their thermal functionality will be lost when the background material is changed,thus limiting their practical applications.To solve this problem,the multiscale topology optimization(MTO)method is employed to design thermal expander metadevices that can maintain their expander functionality under different background materials.In MTO,transformation thermotic technology is used to determine the anisotropic thermal conductiv-ities inside a thermal expander metadevice and topology optimization is performed to generate the topological configuration of each microstructure with the target effective thermal conductivity.Subsequently,the thermal functionalities of thermal double and triple expander metadevices with different background materials are nu-merically verified via simulations.Finally,the thermal double expander metadevice is fabricated via additive manufacturing and experimentally tested for its thermal functionality.The findings of this study address the challenge of designing thermal expander metadevices with background material-independent functionality.展开更多
Flexible manipulation and efficient detection of terahertz wave polarization states remain critical challenges for advancing terahertz technologies in communications,biomedicine,and environmental monitoring.This study...Flexible manipulation and efficient detection of terahertz wave polarization states remain critical challenges for advancing terahertz technologies in communications,biomedicine,and environmental monitoring.This study innovatively proposes an all-dielectric metadevice integrated platform that achieves coordinated polarization gen-eration and detection through multidimensional polarization-channel multiplexing.The proposed device inte-grates four polarization-conversion functional units into a single planar architecture,enabling synchronous generation of four independent polarization channels under unpolarized incidence while establishing direct cor-relations between their intensity profiles and the polarization state of incident waves.Leveraging the Stokes parameter framework,we develop a high-efficiency detection mechanism that precisely reconstructs incident polarization states utilizing only four-channel intensity information,overcoming the limitations of conventional multi-component cascaded polarization detection systems.Experimental results demonstrate the device's excep-tional polarization-resolving capability at 0.9 THz.Furthermore,the platform exhibits significant potential for multidimensional optical field manipulation,successfully generating four-channel polarization-vortex beams with independent topological charges.This compact multichannel polarization-control strategy opens new ave-nues,to our knowledge,for developing portable terahertz imaging systems,high-capacity communication devices,and multidimensional information encryption technologies,thereby accelerating the practical implementation of terahertz science and applications.展开更多
The terahertz(THz)frequency range,situated between microwave and infrared radiation,has emerged as a pivotal domain with broad applications in high-speed communication,imaging,sensing,and biosensing.The development of...The terahertz(THz)frequency range,situated between microwave and infrared radiation,has emerged as a pivotal domain with broad applications in high-speed communication,imaging,sensing,and biosensing.The development of topological THz metadevices represents a notable advancement for photonic technologies,leveraging the distinctive electronic properties and quantum-inspired phenomena inherent to topological materials.These devices enable robust waveguiding capabilities,positioning them as critical components for on-chip data transfer and photonic integrated circuits,particularly within emerging 6G communication frameworks.A principal advantage resides in the capacity to maintain low-loss wave propagation while effectively suppressing backscattering phenomena,a critical requirement for functional components operating at higher frequencies.In parallel,by leveraging advanced materials such as liquid crystals,plasma,and phase-change materials,these devices facilitate real-time control over essential wave parameters,including amplitude,frequency,and phase,which augments the functionality of both communication and sensing systems,opening new avenues for THz-based technologies.This review outlines fundamental principles of topological components and reconfigurable metadevices operating at THz frequencies.We further explore emerging strategies that integrate topological properties and reconfigurability,with a specific focus on their implementation in chip-scale photonic circuits and free-space wavefront control.展开更多
Integrated-resonant units(IRUs),associating various meta-atoms,resonant modes,and functionalities into one supercell,have been promising candidates for tailoring composite and multifunctional electromagnetic responses...Integrated-resonant units(IRUs),associating various meta-atoms,resonant modes,and functionalities into one supercell,have been promising candidates for tailoring composite and multifunctional electromagnetic responses with additional degrees of freedom.Integrated-resonant metadevices can overcome many bottlenecks in conventional optical devices,such as broadband achromatism,efficiency enhancement,response selectivity,and continuous tunability,offering great potential for performant and versatile application scenarios.We focus on the recent progress of integrated-resonant metadevices.Starting from the design principle of IRUs,a variety of IRU-based characteristics and subsequent practical applications,including achromatic imaging,light-field sensing,polarization detection,orbital angular momentum generation,metaholography,nanoprinting,color routing,and nonlinear generation,are introduced.Existing challenges in this field and opinions on future research directions are also provided.展开更多
Metamaterials are composite materials whose material properties(acoustic, electrical, magnetic, or optical, etc.) are determined by their constitutive structural materials, especially the unit cells. The development o...Metamaterials are composite materials whose material properties(acoustic, electrical, magnetic, or optical, etc.) are determined by their constitutive structural materials, especially the unit cells. The development of metamaterials continues to redefine the boundaries of materials science. In the field of electromagnetic research and beyond, these materials offer excellent design flexibility with their customized properties and their tunability under external stimuli. In this paper, we first provide a literature review of metamaterials with a focus on the technology and its evolution. We then discuss steps in the industrialization process and share our own experience.展开更多
Metadevices have emerged as a new element or system in recent years,from optics to mechanical science,showing superior performance and powerful application potential.In this study,a mechanical metadevice that capable ...Metadevices have emerged as a new element or system in recent years,from optics to mechanical science,showing superior performance and powerful application potential.In this study,a mechanical metadevice that capable of low-frequency vibration isolation,which is called metamaterial springs or metasprings,is proposed.Meanwhile,a modular design method is reported to obtain the customizable quasi-zero stiffness characteristic of the designed metaspring.As proof-of-concept,we demonstrate,both in simulations and experiments,the quasi-zero stiffness characteristics of the proposed metasprings using 3D-printed experimental specimens.Moreover,the low-frequency vibration isolation properties of the proposed metasprings is demonstrated both in vibration tests and automotive vibration tests.This work provides a new mechanical metadevice,that is,metasprings for low-frequency vibration isolation,as well as a modular design method for designing metasprings,which may revolutionize vibration isolation devices in the field of low-frequency vibration isolation.展开更多
Surface plasmons(SPs)are electromagnetic surface waves that propagate at the interface between a conductor and a dielectric.Due to their unique ability to concentrate light on two-dimensional platforms and produce ver...Surface plasmons(SPs)are electromagnetic surface waves that propagate at the interface between a conductor and a dielectric.Due to their unique ability to concentrate light on two-dimensional platforms and produce very high local-field intensity,SPs have rapidly fueled a variety of fundamental advances and practical applications.In parallel,the development of metamaterials and metasurfaces has rapidly revolutionized the design concepts of traditional optical devices,fostering the exciting field of meta-optics.This review focuses on recent progress of meta-optics inspired SP devices,which are implemented by the careful design of subwavelength structures and the arrangement of their spatial distributions.Devices of general interest,including coupling devices,on-chip tailoring devices,and decoupling devices,as well as nascent SP applications empowered by sophisticated usage of meta-optics,are introduced and discussed.展开更多
Quasicrystal has attracted lots of attention since its discovery because of the mathematically non-periodic arrangement and physically unique diffraction patterns.By combining the quasi-periodic features of quasicryst...Quasicrystal has attracted lots of attention since its discovery because of the mathematically non-periodic arrangement and physically unique diffraction patterns.By combining the quasi-periodic features of quasicrystal and the special rotational symmetry with metasurface,many novel phenomena and applications are proposed such as optical spin-Hall effect,non-linear far-field radiation control,and broadband polarization conversion.However,the additional functions and effects brought by phase and amplitude modulation on quasicrystal arrangement still lack research.Here,we design and fabricate a dielectric quasicrystal metasurface which can simultaneously reconstruct holographic images and exhibit diffraction patterns by assembling the nanostructures in a quasi-periodic array.Most importantly,we combine the global arrangement of metasurfaces with the local responses(phase and amplitude)of meta-atoms for achieving the dual functionality.Furthermore,we also suppress the zero diffraction order in the far-field based on the quasi-momentum matching rule.The proposed method has great mathematical importance and explores new possibilities for multifunctional meta-devices for holographic display,optical switching and anti-counterfeiting.展开更多
基金supported by National Natural Science Foundation of China(Grant No.52305259)National Postdoctoral Program for In-novative Talents of China(Grant No.BX20230135)+5 种基金China Postdoctoral Science Foundation(Grant No.2023M741261)the New Cornerstone Science Foundation through the XPLORER PRIZEthe Young Top-notch Talent Cultivation Program of Hubei Provincethe Knowledge Innova-tion Program of Wuhan-Shuguangthe Fundamental Research Funds for the Central Universities(Grant No.HUST:2024BRB005)the Taihu Lake Innovation Fund for Future Technology(Grant No.HUST:2023-B-7).
文摘Thermal expander metadevices can yield a large uniform temperature field powered by a linear heat source.Previous design of thermal expander metadevices can be regarded as a combination of achieved thermal cloaks and their background materials.However,these thermal-cloak-inspired expander metadevices have an inherent flaw,i.e.,their thermal functionality will be lost when the background material is changed,thus limiting their practical applications.To solve this problem,the multiscale topology optimization(MTO)method is employed to design thermal expander metadevices that can maintain their expander functionality under different background materials.In MTO,transformation thermotic technology is used to determine the anisotropic thermal conductiv-ities inside a thermal expander metadevice and topology optimization is performed to generate the topological configuration of each microstructure with the target effective thermal conductivity.Subsequently,the thermal functionalities of thermal double and triple expander metadevices with different background materials are nu-merically verified via simulations.Finally,the thermal double expander metadevice is fabricated via additive manufacturing and experimentally tested for its thermal functionality.The findings of this study address the challenge of designing thermal expander metadevices with background material-independent functionality.
基金High-Level Talent Fund of Jiangsu University(JDKQ20250401)Sichuan Science and Technology Program(2025ZNSFSC0847)+1 种基金China Postdoctoral Science Foundation(2023TQ0296)Postdoctoral Fellowship Program of CPSF(GZC20232389).
文摘Flexible manipulation and efficient detection of terahertz wave polarization states remain critical challenges for advancing terahertz technologies in communications,biomedicine,and environmental monitoring.This study innovatively proposes an all-dielectric metadevice integrated platform that achieves coordinated polarization gen-eration and detection through multidimensional polarization-channel multiplexing.The proposed device inte-grates four polarization-conversion functional units into a single planar architecture,enabling synchronous generation of four independent polarization channels under unpolarized incidence while establishing direct cor-relations between their intensity profiles and the polarization state of incident waves.Leveraging the Stokes parameter framework,we develop a high-efficiency detection mechanism that precisely reconstructs incident polarization states utilizing only four-channel intensity information,overcoming the limitations of conventional multi-component cascaded polarization detection systems.Experimental results demonstrate the device's excep-tional polarization-resolving capability at 0.9 THz.Furthermore,the platform exhibits significant potential for multidimensional optical field manipulation,successfully generating four-channel polarization-vortex beams with independent topological charges.This compact multichannel polarization-control strategy opens new ave-nues,to our knowledge,for developing portable terahertz imaging systems,high-capacity communication devices,and multidimensional information encryption technologies,thereby accelerating the practical implementation of terahertz science and applications.
基金the Nanyang Assistant Professorship Start-up Grant and Ministry of Education(Singapore)under AcRF TIER1(RG61/23)support from the Simons Foundation and the Air Force Office of Scientific Research MURI program.
文摘The terahertz(THz)frequency range,situated between microwave and infrared radiation,has emerged as a pivotal domain with broad applications in high-speed communication,imaging,sensing,and biosensing.The development of topological THz metadevices represents a notable advancement for photonic technologies,leveraging the distinctive electronic properties and quantum-inspired phenomena inherent to topological materials.These devices enable robust waveguiding capabilities,positioning them as critical components for on-chip data transfer and photonic integrated circuits,particularly within emerging 6G communication frameworks.A principal advantage resides in the capacity to maintain low-loss wave propagation while effectively suppressing backscattering phenomena,a critical requirement for functional components operating at higher frequencies.In parallel,by leveraging advanced materials such as liquid crystals,plasma,and phase-change materials,these devices facilitate real-time control over essential wave parameters,including amplitude,frequency,and phase,which augments the functionality of both communication and sensing systems,opening new avenues for THz-based technologies.This review outlines fundamental principles of topological components and reconfigurable metadevices operating at THz frequencies.We further explore emerging strategies that integrate topological properties and reconfigurability,with a specific focus on their implementation in chip-scale photonic circuits and free-space wavefront control.
基金the University Grants Committee/Research Grants Council of the Hong Kong Special Administrative Region,China(Project No.AoE/P-502/20,CRF Project No.C5031-22GF,and GRF Project Nos.15303521 and 11310522)the Shenzhen Science and Technology Innovation Commission(Grant No.SGDX2019081623281169)+1 种基金the Department of Science and Technology of Guangdong Province(Grant No.2020B1515120073)the City University of Hong Kong(Project No.9380131).
文摘Integrated-resonant units(IRUs),associating various meta-atoms,resonant modes,and functionalities into one supercell,have been promising candidates for tailoring composite and multifunctional electromagnetic responses with additional degrees of freedom.Integrated-resonant metadevices can overcome many bottlenecks in conventional optical devices,such as broadband achromatism,efficiency enhancement,response selectivity,and continuous tunability,offering great potential for performant and versatile application scenarios.We focus on the recent progress of integrated-resonant metadevices.Starting from the design principle of IRUs,a variety of IRU-based characteristics and subsequent practical applications,including achromatic imaging,light-field sensing,polarization detection,orbital angular momentum generation,metaholography,nanoprinting,color routing,and nonlinear generation,are introduced.Existing challenges in this field and opinions on future research directions are also provided.
基金supported by Guangdong Innovative Research Team Program (2009010005)
文摘Metamaterials are composite materials whose material properties(acoustic, electrical, magnetic, or optical, etc.) are determined by their constitutive structural materials, especially the unit cells. The development of metamaterials continues to redefine the boundaries of materials science. In the field of electromagnetic research and beyond, these materials offer excellent design flexibility with their customized properties and their tunability under external stimuli. In this paper, we first provide a literature review of metamaterials with a focus on the technology and its evolution. We then discuss steps in the industrialization process and share our own experience.
基金supported by the Basic Science Center Project of NSFC under grant No.51788104the China Postdoctoral Science Foundation under Grant No.2022M721850+1 种基金the NSFC under grant No.11974203the Scientific Research Foundation for Talented Scholars of CSUFT University(2024YJ002).
文摘Metadevices have emerged as a new element or system in recent years,from optics to mechanical science,showing superior performance and powerful application potential.In this study,a mechanical metadevice that capable of low-frequency vibration isolation,which is called metamaterial springs or metasprings,is proposed.Meanwhile,a modular design method is reported to obtain the customizable quasi-zero stiffness characteristic of the designed metaspring.As proof-of-concept,we demonstrate,both in simulations and experiments,the quasi-zero stiffness characteristics of the proposed metasprings using 3D-printed experimental specimens.Moreover,the low-frequency vibration isolation properties of the proposed metasprings is demonstrated both in vibration tests and automotive vibration tests.This work provides a new mechanical metadevice,that is,metasprings for low-frequency vibration isolation,as well as a modular design method for designing metasprings,which may revolutionize vibration isolation devices in the field of low-frequency vibration isolation.
基金supported by the National Natural Science Foundation of China(Nos.62005193,62135008,62075158,62175180,61735012,61935015,and 62025504)the U.S.National Science Foundation(No.2114103).
文摘Surface plasmons(SPs)are electromagnetic surface waves that propagate at the interface between a conductor and a dielectric.Due to their unique ability to concentrate light on two-dimensional platforms and produce very high local-field intensity,SPs have rapidly fueled a variety of fundamental advances and practical applications.In parallel,the development of metamaterials and metasurfaces has rapidly revolutionized the design concepts of traditional optical devices,fostering the exciting field of meta-optics.This review focuses on recent progress of meta-optics inspired SP devices,which are implemented by the careful design of subwavelength structures and the arrangement of their spatial distributions.Devices of general interest,including coupling devices,on-chip tailoring devices,and decoupling devices,as well as nascent SP applications empowered by sophisticated usage of meta-optics,are introduced and discussed.
基金the funding provided by the National Key R&D Program of China(2021YFB2802200)Beijing Outstanding Young Scientist Program(BJJWZYJH01201910007022)+3 种基金National Natural Science Foundation of China(No.U21A20140,No.92050117)program,Fok Ying-Tong Education Foundation of China(No.161009)Beijing Municipal Science&Technology Commission,Administrative Commission of Zhongguancun Science Park(No.Z211100004821009)Science and Technology Innovation Program of Beijing Institute of Technology(2021CX01008)supported by the Synergetic Extreme Condition User Facility(SECUF).We also acknowledge the fabrication and measurement service in the Analysis&Testing Center,Beijing Institute of Technology.
文摘Quasicrystal has attracted lots of attention since its discovery because of the mathematically non-periodic arrangement and physically unique diffraction patterns.By combining the quasi-periodic features of quasicrystal and the special rotational symmetry with metasurface,many novel phenomena and applications are proposed such as optical spin-Hall effect,non-linear far-field radiation control,and broadband polarization conversion.However,the additional functions and effects brought by phase and amplitude modulation on quasicrystal arrangement still lack research.Here,we design and fabricate a dielectric quasicrystal metasurface which can simultaneously reconstruct holographic images and exhibit diffraction patterns by assembling the nanostructures in a quasi-periodic array.Most importantly,we combine the global arrangement of metasurfaces with the local responses(phase and amplitude)of meta-atoms for achieving the dual functionality.Furthermore,we also suppress the zero diffraction order in the far-field based on the quasi-momentum matching rule.The proposed method has great mathematical importance and explores new possibilities for multifunctional meta-devices for holographic display,optical switching and anti-counterfeiting.
