Surface Lattice Resonances Generated With One-dimensional Nobel Metallic Nanoparticle Arrays

Localized surface plasmons resonances of nobel metallic nanoparticles can be use to break through the optical diffraction limits,the incident energy can be confined effectively around the structures,which can be important for the design of micro-nano photonic devices,and have gained considerable attention in recent years.However,radiation damping increases significantly with the increasing of the particle sizes,which leads to the broadening of localized surface plasmon resonance peak and the reduction of the near-field enhancements,and it is main obstacle to improve the perfermance of nanophotonic devices.For the noble metallic nanoparticle arrays,the coupling between localized surface plasmon resonances of the metallic nanoparticles and the rayleigh anomaly of the array results in the surface lattice resonances(SLRs),which can be used to effectively supress the radiative losses,and the near-fields as well as the resonance quality factor can be enhanced significantly.Nevertheless,nanoparticle arrays are mainly fabricated with the "top-down" lithography method,which has the problems of high process cost and poor structure scalability.In order to solve the above problems,this study proposed to generate surface lattice resonances with one-dimensional nobel metallic nanoparticlearrays,which can be fabricated with the "bottom-up" template based self-assembly technology.The optical responses for the surface lattice resonances have been carefully studied with the numerical calculation,and the possiblity to fabricate the one-dimensional nobel metallic nanoparticle arrays has been experimentally confirmed.The main work includes:1 First,the optical properties of single-stranded and double-stranded nanoparticles chain structures were simulated by finite difference time-domain method.The effects on the localized surface plasmon resonances by adjusting the distance between the nanoparticles,the polarization direction of the incident light and the refractive index of the surrounding environment were investigated.In addition,the effect of nanoparticle chain length change and the random shift of the oparticles on the localized resonances peak position were also studied.This part of work would be important for the generation and the manipulation of surface lattice resonances in the array structure.2 Surface lattice resonances based on one-dimensional noble metallic nanoparticle arrays.Surface lattice resonances characteristics of nanoparticle single-stranded and double-stranded arrays structures were simulated by finite difference time-domain method.The effects of nanoparticles distance,polarization direction of incident light and refractive index of the surrounding environment on surface lattice resonance were studied,at the same time,the variation of peak position,resonance intensity and quality factor of surface lattice resonances is summarized.This has important guiding significance for thepractical application of surface lattice resonances based on one-dimensional noble metallic nanoparticle arrays.We also investigated the effect of random shifts of nanoparticles in the arrays on the intensity of surface lattice resonances.In the experiments,we are based on dopamine-coated nanoparticles solution and PDMS template with grating structure,nanoparticles periodic arrays structure was prepared by spin coating,the feasibility of preparing such one-dimensional noble metallic nanoparticle arrays structure was confirmed.