Combining bright-feld and edge-enhanced imaging affords an effective avenue for extracting complex morphological information from objects,which is particularly beneficial for biological imaging.Multiplexing metalenses...Combining bright-feld and edge-enhanced imaging affords an effective avenue for extracting complex morphological information from objects,which is particularly beneficial for biological imaging.Multiplexing metalenses present promising candidates for achieving this functionality.However,current multiplexing meta-lenses lack spectral modulation,and crosstalk between different wavelengths hampers the imaging quality,especilly for biological samples requiring precise wavelength specificity.Here,we experimentally demonstrate the nonlocal Huygens'meta-lens for high-quality-factor spin-multiplexing imaging.Quasi-bound states in the continuum(q-BlCs)are excited to provide a high quality factor of 90 and incident-angle dependence.The generalized Kerker condition,driven by Fano-like interactions between q-BIC and in-plane Mie resonances,breaks the radiation symmetry,resulting in a transmission peak with a geometric phase for polarization-converted light,while unconverted light exhibits a transmission dip without a geometric phase.Enhanced polarization conversion efficiency of 65%is achieved,accompanied by a minimal unconverted value,surpassing the theoretical limit of traditional thin nonlocal metasurfaces.Leveraging these effects,the output polarization-converted state exhibits an efficient wavelengthselective focusing phase profle.The unconverted counterpart serves as an effective spatial frequency filter based on incident-angular dispersion,passing high-frequency edge details.Bright-field imaging and edge detection are thus presented under two output spin states.This work provides a versatile framework for nonlocal metasurfaces,boosting biomedical imaging and sensing applications.展开更多
Imaging in the solar blind ultraviolet(UV)region offers significant advantages,including minimal interference from sunlight,reduced background noise,low false-alarm rate,and high sensitivity,and thus has important app...Imaging in the solar blind ultraviolet(UV)region offers significant advantages,including minimal interference from sunlight,reduced background noise,low false-alarm rate,and high sensitivity,and thus has important applications in early warning or detection of fire,ozone depletion,dynamite explosions,missile launches,electric leakage,etc.However,traditional imaging systems in this spectrum are often hindered by the bulkiness and complexity of conventional optics,resulting in heavy and cumbersome setups.The advent of metasurfaces,which use a two-dimensional array of nano-antennas to manipulate light properties,provides a powerful solution for developing miniaturized and compact optical systems.In this study,diamond metalenses were designed and fabricated to enable ultracompact solar-blind UV imaging.To prove this concept,two representative functionalities,bright-field imaging and spiral phase contrast imaging,were demonstrated as examples.Leveraging diamond's exceptional properties,such as its wide bandgap,high refractive index,remarkable chemical inertness,and high damage threshold,this work not only presents a simple and feasible approach to realize solar-blind imaging in an ultracompact form but also highlights diamond as a highly capable material for developing miniaturized,lightweight,and robust imaging systems.展开更多
基金supported by the University Grants Committee/Research Grants Council of the Hong Kong Special Administrative Region,China[Project No.AoE/P-502/20,CRF Project:C5031-22G,GRF Project:CityU15303521,CityU11305223,CityU11300224]City University of Hong Kong[Project No.9380131 and 7005867]+3 种基金National Natural Science Foundation of China[Grant No.62375232]S.X.acknowledges financial support from National Natural Science Foundation of China(Grant Nos.62125501,and 6233000076)Fundamental Research Funds for the Central Universities(Grant No.2022FRRK030004)Shenzhen Fundamental Research Projects(Grant Nos.JCYJ20220818102218040).
文摘Combining bright-feld and edge-enhanced imaging affords an effective avenue for extracting complex morphological information from objects,which is particularly beneficial for biological imaging.Multiplexing metalenses present promising candidates for achieving this functionality.However,current multiplexing meta-lenses lack spectral modulation,and crosstalk between different wavelengths hampers the imaging quality,especilly for biological samples requiring precise wavelength specificity.Here,we experimentally demonstrate the nonlocal Huygens'meta-lens for high-quality-factor spin-multiplexing imaging.Quasi-bound states in the continuum(q-BlCs)are excited to provide a high quality factor of 90 and incident-angle dependence.The generalized Kerker condition,driven by Fano-like interactions between q-BIC and in-plane Mie resonances,breaks the radiation symmetry,resulting in a transmission peak with a geometric phase for polarization-converted light,while unconverted light exhibits a transmission dip without a geometric phase.Enhanced polarization conversion efficiency of 65%is achieved,accompanied by a minimal unconverted value,surpassing the theoretical limit of traditional thin nonlocal metasurfaces.Leveraging these effects,the output polarization-converted state exhibits an efficient wavelengthselective focusing phase profle.The unconverted counterpart serves as an effective spatial frequency filter based on incident-angular dispersion,passing high-frequency edge details.Bright-field imaging and edge detection are thus presented under two output spin states.This work provides a versatile framework for nonlocal metasurfaces,boosting biomedical imaging and sensing applications.
基金National Key Research and Development Program of China(2022YFB3608604)National Natural Science Foundation of China(U21A2070,62374150,62074011,(62134008,62474165)+2 种基金Natural Science FoundationofHenan(242300421216)Science and Technology Major Project of Henan Province(231100230300)Beijing Nova Program(Z201100006820096).
文摘Imaging in the solar blind ultraviolet(UV)region offers significant advantages,including minimal interference from sunlight,reduced background noise,low false-alarm rate,and high sensitivity,and thus has important applications in early warning or detection of fire,ozone depletion,dynamite explosions,missile launches,electric leakage,etc.However,traditional imaging systems in this spectrum are often hindered by the bulkiness and complexity of conventional optics,resulting in heavy and cumbersome setups.The advent of metasurfaces,which use a two-dimensional array of nano-antennas to manipulate light properties,provides a powerful solution for developing miniaturized and compact optical systems.In this study,diamond metalenses were designed and fabricated to enable ultracompact solar-blind UV imaging.To prove this concept,two representative functionalities,bright-field imaging and spiral phase contrast imaging,were demonstrated as examples.Leveraging diamond's exceptional properties,such as its wide bandgap,high refractive index,remarkable chemical inertness,and high damage threshold,this work not only presents a simple and feasible approach to realize solar-blind imaging in an ultracompact form but also highlights diamond as a highly capable material for developing miniaturized,lightweight,and robust imaging systems.
