High-performance infrared(IR)photodetectors made by low dimensional materials promise a wide range of applications in communication,security and biomedicine.Moreover,light-harvesting effects based on novel plasmonic m...High-performance infrared(IR)photodetectors made by low dimensional materials promise a wide range of applications in communication,security and biomedicine.Moreover,light-harvesting effects based on novel plasmonic materials and their combinations with two-dimensional(2 D)materials have raised tremendous interest in recent years,as they may potentially help the device complement or surpass currently commercialized IR photodetectors.Graphene is a particularly attractive plasmonic material because graphene plasmons are electrically tunable with a high degree of electromagnetic confinement in the mid-infrared(mid-IR)to terahertz regime and the field concentration can be further enhanced by forming nanostructures.Here,we report an efficient mid-IR room-temperature photodetector enhanced by plasmonic effect in graphene nanoresonators(GNRs)/graphene heterostructure.The plasmon polaritons in GNRs are size-dependent with strong field localization.Considering that the size and density of GNRs are controllable by chemical vapor deposition method,our work opens a cost-effective and scalable pathway to fabricate efficient IR optoelectronic devices with wavelength tunability.展开更多
The chimera state is the concurrent combination of synchronous and incoherent osdllations in a set of identical oscillators. In this study, we demonstrate the states for optical nanoresonators where the oscillators ar...The chimera state is the concurrent combination of synchronous and incoherent osdllations in a set of identical oscillators. In this study, we demonstrate the states for optical nanoresonators where the oscillators are designed based on a plasmonic dimer cavity. This resonator interchanges radiative energy with an active medium located at its hot.spot, and therefore forms an amplitude-medlated oscillating system. Finite-difference time-domain studied for this system, and strong coupling is shown to force the array members to fully synchronize while weaker coupling causes chimera states in the array.展开更多
Understanding the relationship between plasmon near-field enhancement and lifetime is crucial for various applications,yet their inverse correlation in single-element nanoresonators remains underexplored.Here,we exper...Understanding the relationship between plasmon near-field enhancement and lifetime is crucial for various applications,yet their inverse correlation in single-element nanoresonators remains underexplored.Here,we experimentally demonstrate an inverse correlation between these two parameters in single-element gold lateral V-shaped nanoresonators under different light polarization conditions by tuning the opening angle,through femtosecond time-resolved photoemission electron microscopy.Specifically,under p-polarized light irradiation,as the opening angle of V-shaped nanoresonators decreases,the plasmon near-field enhancement increases while the lifetime shortens simultaneously.展开更多
We discuss the recent advances in meta-optics and nanophotonics associated with the physics of bound states in the continuum(BICs).Such resonant states appear due to a strong coupling between leaky modes in optical gu...We discuss the recent advances in meta-optics and nanophotonics associated with the physics of bound states in the continuum(BICs).Such resonant states appear due to a strong coupling between leaky modes in optical guiding structures being supported by subwavelength high-index dielectric Mieresonant nanoantennas or all-dielectric metasurfaces.First,we review briefly very recent developments in the BIC physics in application to isolated subwavelength particles.We pay a special attention to novel opportunities for nonlinear nanophotonics due to the large field enhancement inside the particle volume creating the resonant states with high-quality(high-Q)factors,the so-called quasi-BIC,that can be supported by the subwavelength particles.Second,we discuss novel applications of the BIC physics to alldielectric optical metasurfaces with broken-symmetry meta-atoms when tuning to the BIC conditions allows to enhance substantially the Q factor of the flat-optics dielectric structures.We also present the original results on nonlinear high-Q metasurfaces and predict that the frequency conversion efficiency can be boosted dramatically by smart engineering of the asymmetry parameter of dielectric metasurfaces in the vicinity of the quasi-BIC regime.展开更多
基金support from the National Key Research&Development Program(No.2016YFA0201902,2018YFA0703200)Shenzhen Nanshan District Pilotage Team Program(LHTD20170006)+4 种基金National Natural Science Foundation of China(61974099 and 61604102,51773041,61890940)Shanghai Committee of Science and Technology in China(18ZR1404900)Natural Science Research Project for Anhui Universities(Grant No.KJ2019A0596)Youth Project of Provincial Natural Science Foundation of Anhui(Grant No.2008085QF319)Australian Research Council(ARC,FT150100450 and IH150100006)。
文摘High-performance infrared(IR)photodetectors made by low dimensional materials promise a wide range of applications in communication,security and biomedicine.Moreover,light-harvesting effects based on novel plasmonic materials and their combinations with two-dimensional(2 D)materials have raised tremendous interest in recent years,as they may potentially help the device complement or surpass currently commercialized IR photodetectors.Graphene is a particularly attractive plasmonic material because graphene plasmons are electrically tunable with a high degree of electromagnetic confinement in the mid-infrared(mid-IR)to terahertz regime and the field concentration can be further enhanced by forming nanostructures.Here,we report an efficient mid-IR room-temperature photodetector enhanced by plasmonic effect in graphene nanoresonators(GNRs)/graphene heterostructure.The plasmon polaritons in GNRs are size-dependent with strong field localization.Considering that the size and density of GNRs are controllable by chemical vapor deposition method,our work opens a cost-effective and scalable pathway to fabricate efficient IR optoelectronic devices with wavelength tunability.
文摘The chimera state is the concurrent combination of synchronous and incoherent osdllations in a set of identical oscillators. In this study, we demonstrate the states for optical nanoresonators where the oscillators are designed based on a plasmonic dimer cavity. This resonator interchanges radiative energy with an active medium located at its hot.spot, and therefore forms an amplitude-medlated oscillating system. Finite-difference time-domain studied for this system, and strong coupling is shown to force the array members to fully synchronize while weaker coupling causes chimera states in the array.
基金National Key Research and Development Program of China(2022YFA1604304,2022YFA1604303)National Natural Science Foundation of China(12404356,12374341)+2 种基金Department of Science and Technology of Jilin Province(YDZJ202401607ZYTS)Natural Science Foundation of Chongqing Municipality(CSTB2023NSCQMSX1026,CSTB2023NSCQ-MSX0302,CSTB2023NSCQMSX0708)111 Project(D17017)。
文摘Understanding the relationship between plasmon near-field enhancement and lifetime is crucial for various applications,yet their inverse correlation in single-element nanoresonators remains underexplored.Here,we experimentally demonstrate an inverse correlation between these two parameters in single-element gold lateral V-shaped nanoresonators under different light polarization conditions by tuning the opening angle,through femtosecond time-resolved photoemission electron microscopy.Specifically,under p-polarized light irradiation,as the opening angle of V-shaped nanoresonators decreases,the plasmon near-field enhancement increases while the lifetime shortens simultaneously.
基金financial support from the Australian Research Councilthe Strategic Fund of the Australian National University+3 种基金the Alexander von Humboldt Foundationfinancial support by the Russian Science Foundation(grant 18-72-10140)financial support by the Ministry of Education and Science of the Russian Federation(3.1500.2017/4.6)support from the Foundation for the Advancement of Theoretical Physics and Mathematics“BASIS”(Russia)
文摘We discuss the recent advances in meta-optics and nanophotonics associated with the physics of bound states in the continuum(BICs).Such resonant states appear due to a strong coupling between leaky modes in optical guiding structures being supported by subwavelength high-index dielectric Mieresonant nanoantennas or all-dielectric metasurfaces.First,we review briefly very recent developments in the BIC physics in application to isolated subwavelength particles.We pay a special attention to novel opportunities for nonlinear nanophotonics due to the large field enhancement inside the particle volume creating the resonant states with high-quality(high-Q)factors,the so-called quasi-BIC,that can be supported by the subwavelength particles.Second,we discuss novel applications of the BIC physics to alldielectric optical metasurfaces with broken-symmetry meta-atoms when tuning to the BIC conditions allows to enhance substantially the Q factor of the flat-optics dielectric structures.We also present the original results on nonlinear high-Q metasurfaces and predict that the frequency conversion efficiency can be boosted dramatically by smart engineering of the asymmetry parameter of dielectric metasurfaces in the vicinity of the quasi-BIC regime.
