Localized surface plasmon resonances(LSPRs)in metal nanostructures have been a central subject of nano-photonics due to their ability to manipulate light beyond the optical diffraction limit.Nevertheless,the large int...Localized surface plasmon resonances(LSPRs)in metal nanostructures have been a central subject of nano-photonics due to their ability to manipulate light beyond the optical diffraction limit.Nevertheless,the large intrinsic dissipations of LSPRs have severely hindered their applications,so the on-demand control of the LSPR modes is highly desired and remains open yet.Here,we experimentally and theoretically demonstrate that the plasmon mode can be effectively engineered by interacting with constructive or destructive modes supported by film interference.When a metal nanoparticle interacts with a constructive mode,the dissipation linewidth of its LSPR mode shows a significant reduction of 58%.Simultaneously,the scattering intensity is remarkably enhanced,in vast favor of measuring weak signals from small nanoparticles.Furthermore,the film-destructiveinterference splitting in the scattering spectrum by weak coupling,rather than strong coupling,is revealed if the plasmon particles interact with the destructive mode,resulting in two new hybrid plasmon modes with narrow linewidths.The effective polarizability model of reshaping the LSPR modes by the film interference is present to well understand the experimental observations.Our work may pave the way toward low-loss plasmonic photonics and its practical applications.展开更多
A large-scale large eddy simulation in high performance personal computer clusters is carried out to present unsteady mixing mechanism of film cooling and the development of films. Simulation cases include a single-ho...A large-scale large eddy simulation in high performance personal computer clusters is carried out to present unsteady mixing mechanism of film cooling and the development of films. Simulation cases include a single-hole plate with the inclined angle of 30° and blowing ratio of 0.5, and a single-row plate with hole-spacing of 1.5D and 2D （diameters of the hole）. According to the massive simulation results, some new unsteady phenomena of gas films are found. The vortex system is changed in different position with the development of film cooling with the time marching the process of a single-row plate film cooling. Due to the mutual interference effects including mutual exclusion, a certain periodic sloshing and mutual fusion, and the structures of a variety of vortices change between parallel gas films. Macroscopic flow structures and heat transfer behaviors are obtained based on 20 million grids and Reynolds number of 28600.展开更多
Flexible electromagnetic interference(EMI)shielding films with high stability have shown promising prospect in harsh working conditions such as military,communication,and special protection fields.Herein,flexible aram...Flexible electromagnetic interference(EMI)shielding films with high stability have shown promising prospect in harsh working conditions such as military,communication,and special protection fields.Herein,flexible aramid nanofibers@polypyrrole(ANF@PPy)films with high stability were easily achieved by the in-situ growth of PPy on the surface of ANF and the subsequent pressured-filtration film-forming process.When the amount of pyrrole(Py)monomer is 40μL,the ANF@PPy(AP40)film exhibited excellent EMI shielding performance with shielding effectiveness(SE)of 41.69 dB,tensile strength of 96.01 MPa,and fracture strain of 21.95%at the thickness of 75.76μm.Particularly,the anticipated EMI shielding performance can be maintained even after being heated at 200℃in air,soaked in 3.5%NaCl solution,repeated folding for one million times,or burned directly,indicating superior environmental durability in harsh conditions.Therefore,it is believed that the ANF@PPy films with high stability offer a facile solution for practical protection for high-performance EMI shielding applications.展开更多
基金supported by the National Key R&D Program of China(Grant No.2021YFA1400800)the Key-Area Research and Development Program of Guangdong Province(Grant No.2018B030329001)+1 种基金the Guangdong Special Support Program(Grant No.2019JC05X397)the Key Project of Natural Science Foundation of Henan(Grant No.232300421141)。
文摘Localized surface plasmon resonances(LSPRs)in metal nanostructures have been a central subject of nano-photonics due to their ability to manipulate light beyond the optical diffraction limit.Nevertheless,the large intrinsic dissipations of LSPRs have severely hindered their applications,so the on-demand control of the LSPR modes is highly desired and remains open yet.Here,we experimentally and theoretically demonstrate that the plasmon mode can be effectively engineered by interacting with constructive or destructive modes supported by film interference.When a metal nanoparticle interacts with a constructive mode,the dissipation linewidth of its LSPR mode shows a significant reduction of 58%.Simultaneously,the scattering intensity is remarkably enhanced,in vast favor of measuring weak signals from small nanoparticles.Furthermore,the film-destructiveinterference splitting in the scattering spectrum by weak coupling,rather than strong coupling,is revealed if the plasmon particles interact with the destructive mode,resulting in two new hybrid plasmon modes with narrow linewidths.The effective polarizability model of reshaping the LSPR modes by the film interference is present to well understand the experimental observations.Our work may pave the way toward low-loss plasmonic photonics and its practical applications.
基金partially supported by the National Science and Technology Major Project(2013CB035700)the National Natural Science Foundation of China(11672225,11511130053)the Funds for the Central Universities(xjj2014135)
文摘A large-scale large eddy simulation in high performance personal computer clusters is carried out to present unsteady mixing mechanism of film cooling and the development of films. Simulation cases include a single-hole plate with the inclined angle of 30° and blowing ratio of 0.5, and a single-row plate with hole-spacing of 1.5D and 2D （diameters of the hole）. According to the massive simulation results, some new unsteady phenomena of gas films are found. The vortex system is changed in different position with the development of film cooling with the time marching the process of a single-row plate film cooling. Due to the mutual interference effects including mutual exclusion, a certain periodic sloshing and mutual fusion, and the structures of a variety of vortices change between parallel gas films. Macroscopic flow structures and heat transfer behaviors are obtained based on 20 million grids and Reynolds number of 28600.
基金the Science and Technology Commission of Shanghai Municipality(Nos.20230742300 and 18595800700)the project of“joint assignment”in Shanghai University led by Prof.
文摘Flexible electromagnetic interference(EMI)shielding films with high stability have shown promising prospect in harsh working conditions such as military,communication,and special protection fields.Herein,flexible aramid nanofibers@polypyrrole(ANF@PPy)films with high stability were easily achieved by the in-situ growth of PPy on the surface of ANF and the subsequent pressured-filtration film-forming process.When the amount of pyrrole(Py)monomer is 40μL,the ANF@PPy(AP40)film exhibited excellent EMI shielding performance with shielding effectiveness(SE)of 41.69 dB,tensile strength of 96.01 MPa,and fracture strain of 21.95%at the thickness of 75.76μm.Particularly,the anticipated EMI shielding performance can be maintained even after being heated at 200℃in air,soaked in 3.5%NaCl solution,repeated folding for one million times,or burned directly,indicating superior environmental durability in harsh conditions.Therefore,it is believed that the ANF@PPy films with high stability offer a facile solution for practical protection for high-performance EMI shielding applications.
