[19p-S622-1~16] 3.12 Nanoscale optical science and near-field optics

△ [19p-S622-13] Analysis of surface plasmon modes on metalic nanostructures by cathodoluminescence imaging

〇(M1)Daiki Nokubo¹, Atsushi Ono^1,2, Wataru Inami^1,2, Yoshimasa Kawata^1,2 (1.Graduate school of engineering, Shizuoka Uni., 2.Research institute of electronics, Shizuoka Uni.)

Keywords:Localized surface plasmon,Cathodoluminescence,Dimmer

We visualized LSPR of AuAg nanoparticles and nanodimmer structures by cathodoluminescence(CL) imaging. We analyzed the CL spectrum of each structure and acquired CL image at the emission peak wavelength. First, we analyzed CL spectrum of AuAg nanoparticles (particle size:100nm). Peak wavelength of nanoparticles are 390nm(Ag) and 520nm(Au).This peak wavelength shows the SPR wavelength of each nanoparticles. Therefore, we acquired the CL image at the peak wavelength(Ag:390nm,Au:520nm). From result, we observed that each nanoparticles show the strong emission at a circumference part. This result shows SPR of nanoparticle oscillates in the diameter direction. Second, we analyzed the CL spectrum of dimmer structure(particle size:100nm). Peak wavelength of dimmer was the same as single nanoparticles. So we acquired the CL image of dimmer at the peak wavelength(Ag:390nm,Au:520nm). From result, we observed that noncontacted part strongly emitted and emission from contacted part is very weak. This result shows that oscillation mode of dimmer is different from single nanoparticle and the transverse mode is excited in the dimmer. From these results, we can succeed to visualize the LSPR of nanoparticle and nanodimmer.