A plasmonic filter and sensor is designed based on an end-coupled ring-groove composited resonator(RGCR).According to the magnetic field distributions of the resonance modes,a horizontal or vertical groove is added to...A plasmonic filter and sensor is designed based on an end-coupled ring-groove composited resonator(RGCR).According to the magnetic field distributions of the resonance modes,a horizontal or vertical groove is added to the perfect ring resonator,and the transmission peaks for the 1st and the 2nd modes can be linearly changed by the length of the groove.In this case,the proposed structure can act as an on-chip optical filter with flexible wavelength manipulation.When the groove is rotated with an angle of?/4,Fano resonance arises due to the mode interference.Dual asymmetric sharp transmission peaks are achieved around the wavelength of the former 2nd resonance mode.High figure of merit and high sensitivity are obtained for the structure,and it is believed that the device can find widely applications in the biochemistry sensing area.The corresponding spectra and the propagation characteristics are numerically investigated by using the finite-difference time-domain method.展开更多
2D-material-based photodetectors enhanced by plasmonic nanostructures can support responsivity/detectivity several orders higher than commercial photodetectors,drawing extensive attention as promising candidates for t...2D-material-based photodetectors enhanced by plasmonic nanostructures can support responsivity/detectivity several orders higher than commercial photodetectors,drawing extensive attention as promising candidates for the next-generation photodetectors.However,to boost the nanostructure-enhanced 2D photodetectors into real-world applications,crucial challenges lie in the design of broadband enhancing nanostructures and their scalable and position-controllable fabrication.Here,based on a broadband resonant plasmonic disk array fabricated by a scalable and position-controllable technique(direct writing photolithography),we present a visible-near infrared(405-1310 nm)2D WS_(2) photodetector,whose detectivity is up to 3.9×10^(14)Jones,a value exceeding that of the previous plasmon-enhanced 2D photodetectors.The broadened spectral response range and the high detectivity originate from the hot electron injection,optical absorption enhancement,and strain effect supported by the plasmonic array.Furthermore,the designed plasmonic 2D photodetector supports self-powered photodetection,indicating promising potential in energy-free and portable optoelectronic systems.Our results demonstrate an effective method to construct high-performance broadband photodetectors,which can facilitate the development of 2D photodetectors in commercial applications.展开更多
基金supported by the National Natural Science Foundation of China under Grants (61405039) and (61475037)Science and Technology Planning Projects of Guangdong Province,China under Grant (2016A 020223013)+4 种基金the Natural Science Foundation of Guangdong Province,China,under Grant (2014A030310300)the Foundation for Distinguished Young Talents in Higher Education of Guangdong,China,under Grant (2014KQNCX066)Research Fund for the Doctoral Program of Higher Education of China under Grant (20134407 110008)Guangzhou Science and Technology Project of Guangdong Province,China under Grant (2016201604030027)the Research Fund of Guangdong University of Technology under Grant (16ZK0041 ,13ZK0387)
文摘A plasmonic filter and sensor is designed based on an end-coupled ring-groove composited resonator(RGCR).According to the magnetic field distributions of the resonance modes,a horizontal or vertical groove is added to the perfect ring resonator,and the transmission peaks for the 1st and the 2nd modes can be linearly changed by the length of the groove.In this case,the proposed structure can act as an on-chip optical filter with flexible wavelength manipulation.When the groove is rotated with an angle of?/4,Fano resonance arises due to the mode interference.Dual asymmetric sharp transmission peaks are achieved around the wavelength of the former 2nd resonance mode.High figure of merit and high sensitivity are obtained for the structure,and it is believed that the device can find widely applications in the biochemistry sensing area.The corresponding spectra and the propagation characteristics are numerically investigated by using the finite-difference time-domain method.
基金National Natural Science Foundation of China(62131018,12104100)Natural Science Foundation of Guangdong Province(2022A1515010027)+1 种基金Guangzhou Municipal Science and Technology Project(SL2022A04J01205)Nanovision Technology(Beijing)Co.,Ltd.(607230264)。
文摘2D-material-based photodetectors enhanced by plasmonic nanostructures can support responsivity/detectivity several orders higher than commercial photodetectors,drawing extensive attention as promising candidates for the next-generation photodetectors.However,to boost the nanostructure-enhanced 2D photodetectors into real-world applications,crucial challenges lie in the design of broadband enhancing nanostructures and their scalable and position-controllable fabrication.Here,based on a broadband resonant plasmonic disk array fabricated by a scalable and position-controllable technique(direct writing photolithography),we present a visible-near infrared(405-1310 nm)2D WS_(2) photodetector,whose detectivity is up to 3.9×10^(14)Jones,a value exceeding that of the previous plasmon-enhanced 2D photodetectors.The broadened spectral response range and the high detectivity originate from the hot electron injection,optical absorption enhancement,and strain effect supported by the plasmonic array.Furthermore,the designed plasmonic 2D photodetector supports self-powered photodetection,indicating promising potential in energy-free and portable optoelectronic systems.Our results demonstrate an effective method to construct high-performance broadband photodetectors,which can facilitate the development of 2D photodetectors in commercial applications.
