Passive radiative thermal management holds substantial potential for enhancing energy efficiency and sustainability.However,few research efforts have addressed the integration of mechanical robustness and durability w...Passive radiative thermal management holds substantial potential for enhancing energy efficiency and sustainability.However,few research efforts have addressed the integration of mechanical robustness and durability with the distribution and composition of photonic structures within materials.Silk fibers,known for their distinctive hierarchical morphological structure,offer a solution to these challenges by providing exceptional optical and mechanical properties.Inspired by this,we developed a silk-like tough metafiber(PMABF)that incorporated multiple scatterers through a multi-scale structural construction of nanofiber aggregates and molecular interface engineering.We show that fabrics woven with PMABF can provide high midinfrared(MIR)emissivity(98.6%)within the atmospheric window and 86.7%reflectivity in the solar spectrum,attributed to its ellipsoidal photonic structure featuring by surface micro-/nano-particles and numerous internal voids.Through mature and scalable industrial manufacturing routes,our metafibers show excellent mechanical strength,hydrophobicity and thermal stability while maintaining effective passive radiative cooling.Practical application tests demonstrated that molecules introduced during the heterogeneous composite process significantly enhanced the metafiber’s tensile strength(125%)and compressive stress(261.5%)by forming junction welds among the nanofiber backbones to efficiently distribute the external forces.Furthermore,the superior thermal stability and flexibility of PMABF open abundant opportunities for diverse applications with demanding thermal management requirements,such as thermal protection and multi-scenario thermal camouflage.展开更多
The generation of tunably focused light at remote locations is a critical photonic functionality for a wide range of applications.Here,we present a novel concept in the emerging field of Metafibers that achieves,for t...The generation of tunably focused light at remote locations is a critical photonic functionality for a wide range of applications.Here,we present a novel concept in the emerging field of Metafibers that achieves,for the first time,fast,alignment-free,fiber-integrated spatial focus control in a monolithic arrangement.This is enabled by 3D nanoprinted intensity-sensitive phase-only on-fiber holograms,which establish a direct correlation between the intensity distribution in the hologram plane and the focus position.Precise adjustment to the relative power between the modes of a dual-core fiber generates a power-controlled interference pattern within the hologram,enabling controlled and dynamic focus shifts.This study addresses all relevant aspects,including computational optimization,advanced 3D nanoprinting,and tailored fiber fabrication.Experimental results supported by simulations validate the feasibility and efficiency of this monolithic Metafiber platform,which enables fast focus modulation and has transformative potential in optical manipulation,high-speed laser micromachining,telecommunications,and minimally invasive surgery.展开更多
Refractive index(RI)sensors play an important role in various applications including biomedical analysis and food processing industries.However,developing RI sensors with both high resolution and wide linear range rem...Refractive index(RI)sensors play an important role in various applications including biomedical analysis and food processing industries.However,developing RI sensors with both high resolution and wide linear range remains a great challenge due to the tradeoff between quality(Q)factor and free spectral range(FSR)of resonance mode.Herein,the optical steelyard principle is presented to address this challenge by synergizing resonances from the FabryPerot(FP)cavity and metasurface,integrated in a hybrid configuration form on the end facet of optical fibers.Specifically,the FP resonance acting like the scale beam,offers high resolution while the plasmonic resonance acting like the weight,provides a wide linear range.Featuring asymmetric Fano spectrum due to modal coupling between these two resonances,a high Q value(~3829 in liquid)and a sensing resolution(figure of merit)of 2664 RIU^(-1)are experimentally demonstrated.Meanwhile,a wide RI sensing range(1.3301.430 in the simulation and 1.34031.3757 in the experiment)is realized,corresponding to a spectral shift across several FSRs(four and two FSRs in the simulation and experiment,respectively).The proposed steelyard RI sensing strategy is promising in versatile monitoring applications,e.g.,water salinity/turbidity and biomedical reaction process,and could be extended to other types of sensors calling for both high resolution and wide linear range.展开更多
Pulsed polarized vortex beams,a special form of structured light,are generated by tailoring the light beam spatiotemporally and witness the growing application demands in nonlinear optics such as ultrafast laser proce...Pulsed polarized vortex beams,a special form of structured light,are generated by tailoring the light beam spatiotemporally and witness the growing application demands in nonlinear optics such as ultrafast laser processing and surface plasma excitation.However,existing techniques for generating polarized vortex beams suffer from either low compactness due to the use of bulky components or limited controlment of pulse performance.Here,an all-fiber technique combining plasmonic metafibers with mode conversion method is harnessed to generate high-performance pulsed polarized vortex beams.Plasmonic metafibers are utilized as saturable absorbers to produce Q-switched pulses with micro-second duration,while the offset splicing method is employed to partially convert the fundamental transverse mode(LP_(01))to higher-order mode(LP_(11)).Eventually,a polarized vortex beams laser is achieved at the telecom band with a repetition frequency of 116.0 kHz.The impact of geometrical parameters including period of metafibers and offset of splicing on the spatiotemporal properties of pulsed polarized vortex beams is systematically investigated.Our findings could pave the way for design,control and generation of all-fiber pulsed polarized vortex beams,and also offer insights into the development of other types of structured laser sources.展开更多
Metafibers expand the functionalities of conventional optical fibres to unprecedented nanoscale light manipulations by integrating metasurfaces on the fibre tips,becoming an emerging light-coupling platform for both t...Metafibers expand the functionalities of conventional optical fibres to unprecedented nanoscale light manipulations by integrating metasurfaces on the fibre tips,becoming an emerging light-coupling platform for both the nanoscience and fibre optics communities.Current metafibers remain proof-of-concept demonstrations that mostly explore isolated bare fibres owing to the lack of standard interfaces with universal fibre networks.Here,we develop methodologies for fabricating well-defined plasmonic metasurfaces directly on the end facets of commercial single-mode fibre jumpers using standard planar technologies and provide the first demonstration of their practical applications in the nonlinear plasmonic regime.Featuring plug-and-play connections with fibre circuitry and arbitrary metasurface landscapes,the metafibers with tunable plasmonic resonances are implemented into fibre laser cavities,yielding all-fibre sub-picosecond(minimum 513 fs)soliton mode locked lasers at optical wavelengths of 1.5μm and 2μm,demonstrating their unusual polarimetric nonlinear transfer functions and superior saturation absorption responses.The nanofabrication process flow is compatible with existing cleanroom technologies,offering metafibers an avenue to become a regular member of functionalised fibre components.This work paves the way toward the next generation of ultrafast lasers,optical frequency combs,and ultracompact‘all-in-fibre’optical systems.展开更多
基金supported by the National Natural Science Foundation of China(NO.22176031)the Fundamental Research Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University(CUSF-DH-D-2023029).
文摘Passive radiative thermal management holds substantial potential for enhancing energy efficiency and sustainability.However,few research efforts have addressed the integration of mechanical robustness and durability with the distribution and composition of photonic structures within materials.Silk fibers,known for their distinctive hierarchical morphological structure,offer a solution to these challenges by providing exceptional optical and mechanical properties.Inspired by this,we developed a silk-like tough metafiber(PMABF)that incorporated multiple scatterers through a multi-scale structural construction of nanofiber aggregates and molecular interface engineering.We show that fabrics woven with PMABF can provide high midinfrared(MIR)emissivity(98.6%)within the atmospheric window and 86.7%reflectivity in the solar spectrum,attributed to its ellipsoidal photonic structure featuring by surface micro-/nano-particles and numerous internal voids.Through mature and scalable industrial manufacturing routes,our metafibers show excellent mechanical strength,hydrophobicity and thermal stability while maintaining effective passive radiative cooling.Practical application tests demonstrated that molecules introduced during the heterogeneous composite process significantly enhanced the metafiber’s tensile strength(125%)and compressive stress(261.5%)by forming junction welds among the nanofiber backbones to efficiently distribute the external forces.Furthermore,the superior thermal stability and flexibility of PMABF open abundant opportunities for diverse applications with demanding thermal management requirements,such as thermal protection and multi-scenario thermal camouflage.
基金German Research Foundation(DFG)via the grants SCHM2655/21-1,SCHM2655/23-1,QI 140/2-1。
文摘The generation of tunably focused light at remote locations is a critical photonic functionality for a wide range of applications.Here,we present a novel concept in the emerging field of Metafibers that achieves,for the first time,fast,alignment-free,fiber-integrated spatial focus control in a monolithic arrangement.This is enabled by 3D nanoprinted intensity-sensitive phase-only on-fiber holograms,which establish a direct correlation between the intensity distribution in the hologram plane and the focus position.Precise adjustment to the relative power between the modes of a dual-core fiber generates a power-controlled interference pattern within the hologram,enabling controlled and dynamic focus shifts.This study addresses all relevant aspects,including computational optimization,advanced 3D nanoprinting,and tailored fiber fabrication.Experimental results supported by simulations validate the feasibility and efficiency of this monolithic Metafiber platform,which enables fast focus modulation and has transformative potential in optical manipulation,high-speed laser micromachining,telecommunications,and minimally invasive surgery.
基金support from the National Natural Science Foundation of China(62275221).
文摘Refractive index(RI)sensors play an important role in various applications including biomedical analysis and food processing industries.However,developing RI sensors with both high resolution and wide linear range remains a great challenge due to the tradeoff between quality(Q)factor and free spectral range(FSR)of resonance mode.Herein,the optical steelyard principle is presented to address this challenge by synergizing resonances from the FabryPerot(FP)cavity and metasurface,integrated in a hybrid configuration form on the end facet of optical fibers.Specifically,the FP resonance acting like the scale beam,offers high resolution while the plasmonic resonance acting like the weight,provides a wide linear range.Featuring asymmetric Fano spectrum due to modal coupling between these two resonances,a high Q value(~3829 in liquid)and a sensing resolution(figure of merit)of 2664 RIU^(-1)are experimentally demonstrated.Meanwhile,a wide RI sensing range(1.3301.430 in the simulation and 1.34031.3757 in the experiment)is realized,corresponding to a spectral shift across several FSRs(four and two FSRs in the simulation and experiment,respectively).The proposed steelyard RI sensing strategy is promising in versatile monitoring applications,e.g.,water salinity/turbidity and biomedical reaction process,and could be extended to other types of sensors calling for both high resolution and wide linear range.
基金supported by the National Natural Science Foundation of China(Grant No.62071016)the State Key Laboratory of Advanced Optical Communication Systems and Networks,China,and College Students Innovative Entrepreneurial Training Plan Program.
文摘Pulsed polarized vortex beams,a special form of structured light,are generated by tailoring the light beam spatiotemporally and witness the growing application demands in nonlinear optics such as ultrafast laser processing and surface plasma excitation.However,existing techniques for generating polarized vortex beams suffer from either low compactness due to the use of bulky components or limited controlment of pulse performance.Here,an all-fiber technique combining plasmonic metafibers with mode conversion method is harnessed to generate high-performance pulsed polarized vortex beams.Plasmonic metafibers are utilized as saturable absorbers to produce Q-switched pulses with micro-second duration,while the offset splicing method is employed to partially convert the fundamental transverse mode(LP_(01))to higher-order mode(LP_(11)).Eventually,a polarized vortex beams laser is achieved at the telecom band with a repetition frequency of 116.0 kHz.The impact of geometrical parameters including period of metafibers and offset of splicing on the spatiotemporal properties of pulsed polarized vortex beams is systematically investigated.Our findings could pave the way for design,control and generation of all-fiber pulsed polarized vortex beams,and also offer insights into the development of other types of structured laser sources.
文摘Metafibers expand the functionalities of conventional optical fibres to unprecedented nanoscale light manipulations by integrating metasurfaces on the fibre tips,becoming an emerging light-coupling platform for both the nanoscience and fibre optics communities.Current metafibers remain proof-of-concept demonstrations that mostly explore isolated bare fibres owing to the lack of standard interfaces with universal fibre networks.Here,we develop methodologies for fabricating well-defined plasmonic metasurfaces directly on the end facets of commercial single-mode fibre jumpers using standard planar technologies and provide the first demonstration of their practical applications in the nonlinear plasmonic regime.Featuring plug-and-play connections with fibre circuitry and arbitrary metasurface landscapes,the metafibers with tunable plasmonic resonances are implemented into fibre laser cavities,yielding all-fibre sub-picosecond(minimum 513 fs)soliton mode locked lasers at optical wavelengths of 1.5μm and 2μm,demonstrating their unusual polarimetric nonlinear transfer functions and superior saturation absorption responses.The nanofabrication process flow is compatible with existing cleanroom technologies,offering metafibers an avenue to become a regular member of functionalised fibre components.This work paves the way toward the next generation of ultrafast lasers,optical frequency combs,and ultracompact‘all-in-fibre’optical systems.
