Broadband absorbers generally consist of plasmonic cavities coupled to metallic resonators separated by a dielectric film,and they are vertically stacking configurations.In this work,we propose an ultra-broadband nano...Broadband absorbers generally consist of plasmonic cavities coupled to metallic resonators separated by a dielectric film,and they are vertically stacking configurations.In this work,we propose an ultra-broadband nanowire metamaterial absorber composed of an array of vertically aligned dielectric nanowires with coaxial metallic rings.The absorber shows strong absorption from 0.2 to 7μm with an average absorption larger than 91%due to the excitation of gap surface plasmon polariton modes in Fabry–Perot-like resonators.Moreover,a refractory dielectric cladding can be added to improve the thermal stability of the absorber,showing a negligible impact on its absorption performance.The proposed absorber may find potential applications in solar energy harvesting,infrared imaging and spectroscopy,and optoelectronic devices.展开更多
Plasmonic nanostructures stand at the forefront of nanophotonics research,particularly in sensing and energy conversion applications.Their unique ability to confine light energy at the nanoscale makes them indispensab...Plasmonic nanostructures stand at the forefront of nanophotonics research,particularly in sensing and energy conversion applications.Their unique ability to confine light energy at the nanoscale makes them indispensable for a wide array of technological advancements.The study of these structures often makes use of different materials and,even more extensively,explores new shapes and configurations to extend our common repertoire of useful nanophotonics tools.Exploring the creation of bimetallic plasmonic nanostructures combines these two dimensions determining the space of possible plasmonic resonators and opens the possibility of tailoring systems with behavior unavailable to single-metal plasmonic structures.In this paper,we delve into the exploration of bimetallic systems employing plasmonic nanostars.These structures have demonstrated remarkable capabilities for surface-enhanced Raman scattering(SERS)spectroscopy and photochemistry,due to the strong plasmonic response of their peaks,whose disposition following a spherical symmetry makes them largely polarization-and orientationinsensitive.Herein,we report the colloidal synthesis of two different water-stable Au@Ag nanostars,explore their performance as photocatalysts and SERS substrates,and provide an in-depth account of their non-trivial physical response.展开更多
基金National Natural Science Foundation of China(62005037)Chengdu University of Information Technology(KYTZ202180)+1 种基金National Key Research and Development Program of China(2019YFB2203400)111 Project(B20030)。
文摘Broadband absorbers generally consist of plasmonic cavities coupled to metallic resonators separated by a dielectric film,and they are vertically stacking configurations.In this work,we propose an ultra-broadband nanowire metamaterial absorber composed of an array of vertically aligned dielectric nanowires with coaxial metallic rings.The absorber shows strong absorption from 0.2 to 7μm with an average absorption larger than 91%due to the excitation of gap surface plasmon polariton modes in Fabry–Perot-like resonators.Moreover,a refractory dielectric cladding can be added to improve the thermal stability of the absorber,showing a negligible impact on its absorption performance.The proposed absorber may find potential applications in solar energy harvesting,infrared imaging and spectroscopy,and optoelectronic devices.
基金supported by the projects PID2020-120306RB-I00,PID2020-118282RA-I00,PID2020-113704RB-I00TED2021-130038A-I00,TED2021-132101B-I00,RYC2021-033818-I,PDC2021-121787-I00,and FPU21/03137,funded by MCIN/AEI/10.13039/501100011033 and European Union“NextGenerationEU”/PRTR+5 种基金ED431C 2022/24 funded by Xunta de Galicia2020SGR00166 funded by Generalitat de Cataluña2021PFR-URV-B2-02 funded by Universitat Rovira i VirgiliHORIZON-EIC-2022-PATHFINDERCHALLENGES-01-06(No.101115149)HORIZON-HLTH-2022-DISEASE-06-TWOSTAGE(No.101080889)funded by the European Union Horizon 2020 Research and Innovation Program。
文摘Plasmonic nanostructures stand at the forefront of nanophotonics research,particularly in sensing and energy conversion applications.Their unique ability to confine light energy at the nanoscale makes them indispensable for a wide array of technological advancements.The study of these structures often makes use of different materials and,even more extensively,explores new shapes and configurations to extend our common repertoire of useful nanophotonics tools.Exploring the creation of bimetallic plasmonic nanostructures combines these two dimensions determining the space of possible plasmonic resonators and opens the possibility of tailoring systems with behavior unavailable to single-metal plasmonic structures.In this paper,we delve into the exploration of bimetallic systems employing plasmonic nanostars.These structures have demonstrated remarkable capabilities for surface-enhanced Raman scattering(SERS)spectroscopy and photochemistry,due to the strong plasmonic response of their peaks,whose disposition following a spherical symmetry makes them largely polarization-and orientationinsensitive.Herein,we report the colloidal synthesis of two different water-stable Au@Ag nanostars,explore their performance as photocatalysts and SERS substrates,and provide an in-depth account of their non-trivial physical response.
