Interpenetrating phase composites (IPCs) are a new class of composite materials with improved combinations of mechanical and physical properties. This study was performed on a new type of IPC called metal porous polym...Interpenetrating phase composites (IPCs) are a new class of composite materials with improved combinations of mechanical and physical properties. This study was performed on a new type of IPC called metal porous polymer composite (MPPC) with an interpenetrating network structure. Aluminum-polypropylene (AI-PE) and Aluminum-epoxy resin (Al-Ep) composites were produced by infiltrating the polymer in the aluminum foam. The composite microstructures were characterized using SEM observation. The compressive behavior and energy absorption characteristics of MPPC were investigated and compared with the aluminum foams. The compressive modulus of composite was compared with the VOIGT-REUSS bounds and HASHIN-SHTRIKMAN (H-S) bounds models. The experimental modulus of compressive tests falls well within the theoretical models.展开更多
Chirality, which describes the broken mirror symmetry in geometric structures, exists macroscopically in our daily life as well as microscopically down to molecular levels. Correspondingly, chiral molecules interact d...Chirality, which describes the broken mirror symmetry in geometric structures, exists macroscopically in our daily life as well as microscopically down to molecular levels. Correspondingly, chiral molecules interact differently with circularly polarized light exhibiting opposite handedness(left-handed and right-handed). However, the interaction between chiral molecules and chiral light is very weak. In contrast, artificial chiral plasmonic structures can generate "super-chiral" plasmonic near-field, leading to enhanced chiral light-matter(or chiroptical) interactions. The "super-chiral" near-field presents different amplitude and phase under opposite handedness incidence, which can be utilized to engineer linear and nonlinear chiroptical interactions. Specifically,in the interaction between quantum emitters and chiral plasmonic structures, the chiral hot spots can favour the emission with a specific handedness. This article reviews the state-of-the-art research on the design, fabrication and chiroptical response of different chiral plasmonic nanostructures or metasurfaces. This review also discusses enhanced chiral light-matter interactions that are essential for applications like chirality sensing, chiral selective light emitting and harvesting. In the final part, the review ends with a perspective on future directions of chiral plasmonics.展开更多
The eigenmodes analysis of Bloch modes in a chain of metallic nanowires(MNWs)provides a significant physical understanding about the light propagation phenomena involved in such structures.However,most of these analys...The eigenmodes analysis of Bloch modes in a chain of metallic nanowires(MNWs)provides a significant physical understanding about the light propagation phenomena involved in such structures.However,most of these analyses have been done above the light line in the dispersion relation,where the Bloch modes can only be excited with radiative modes.By making use of the Fourier modal method,in this paper we rigorously calculate the eigenmode and mode excitation of a chain of MNWs via the fundamental transverse magnetic(TM)mode of a dielectric waveguide.Quadrupolar and dipolar transversal Bloch modes were obtained in an MNW chain embedded in a dielectric material.These modes can be coupled efficiently with the fundamental TM mode of the waveguide.Since the eigenmodes supported by the integrated plasmonic structure exhibit strong localized surface plasmon(LSP)resonances,they could serve as a nanodevice for sensing applications.Also,the analysis opens a direction for novel nanostructures,potentially helpful for the efficient excitation of LSPs and strong field enhancement.展开更多
基金Project supported by Conseil General de 1'Aube (district grant) and the European Social Fund
文摘Interpenetrating phase composites (IPCs) are a new class of composite materials with improved combinations of mechanical and physical properties. This study was performed on a new type of IPC called metal porous polymer composite (MPPC) with an interpenetrating network structure. Aluminum-polypropylene (AI-PE) and Aluminum-epoxy resin (Al-Ep) composites were produced by infiltrating the polymer in the aluminum foam. The composite microstructures were characterized using SEM observation. The compressive behavior and energy absorption characteristics of MPPC were investigated and compared with the aluminum foams. The compressive modulus of composite was compared with the VOIGT-REUSS bounds and HASHIN-SHTRIKMAN (H-S) bounds models. The experimental modulus of compressive tests falls well within the theoretical models.
基金the Singapore National Research Foundation-Agence Nationale de la Recherche(Grant No.NRF2017-NRF-ANR0052DCHIRAL).
文摘Chirality, which describes the broken mirror symmetry in geometric structures, exists macroscopically in our daily life as well as microscopically down to molecular levels. Correspondingly, chiral molecules interact differently with circularly polarized light exhibiting opposite handedness(left-handed and right-handed). However, the interaction between chiral molecules and chiral light is very weak. In contrast, artificial chiral plasmonic structures can generate "super-chiral" plasmonic near-field, leading to enhanced chiral light-matter(or chiroptical) interactions. The "super-chiral" near-field presents different amplitude and phase under opposite handedness incidence, which can be utilized to engineer linear and nonlinear chiroptical interactions. Specifically,in the interaction between quantum emitters and chiral plasmonic structures, the chiral hot spots can favour the emission with a specific handedness. This article reviews the state-of-the-art research on the design, fabrication and chiroptical response of different chiral plasmonic nanostructures or metasurfaces. This review also discusses enhanced chiral light-matter interactions that are essential for applications like chirality sensing, chiral selective light emitting and harvesting. In the final part, the review ends with a perspective on future directions of chiral plasmonics.
文摘The eigenmodes analysis of Bloch modes in a chain of metallic nanowires(MNWs)provides a significant physical understanding about the light propagation phenomena involved in such structures.However,most of these analyses have been done above the light line in the dispersion relation,where the Bloch modes can only be excited with radiative modes.By making use of the Fourier modal method,in this paper we rigorously calculate the eigenmode and mode excitation of a chain of MNWs via the fundamental transverse magnetic(TM)mode of a dielectric waveguide.Quadrupolar and dipolar transversal Bloch modes were obtained in an MNW chain embedded in a dielectric material.These modes can be coupled efficiently with the fundamental TM mode of the waveguide.Since the eigenmodes supported by the integrated plasmonic structure exhibit strong localized surface plasmon(LSP)resonances,they could serve as a nanodevice for sensing applications.Also,the analysis opens a direction for novel nanostructures,potentially helpful for the efficient excitation of LSPs and strong field enhancement.
