期刊
ACS NANO
卷 10, 期 3, 页码 3835-3842出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b00715
关键词
surface plasmon resonance; near-field imaging dephasing photoemission electron microscopy (PEEM); dark plasmon mode
类别
资金
- KAKENHI [23225006, 26870014]
- Japan Society for the Promotion of Science (JSPS) [25107501]
- Nanotechnology Platform (Hokkaido University)
- Low-Carbon Research Network of Japan
- Grants-in-Aid for Scientific Research [26706018, 15H01073, 15H00856, 26870014, 23225006] Funding Source: KAKEN
Dipole and quadrupole modes are the two lowest orders of localized surface plasmon resonance (LSPR) eigenmodes in metallic nanoparticles. Of these two modes, the quadrupole mode is forbidden for symmetric metallic nanoparticles excited by linearly polarized light at normal incidence. Here, we demonstrate excitation of the quadrupole mode in symmetrical gold (Au) nanoblocks shined with s -polarized light at oblique incidence. In particular, we probe the near -field LSPR in Au nanoblocks using photoemission electron microscopy (PEEM) and find that at oblique incidence, the dipole and quadrupole modes can be selectively excited, in terms of near -field enhancement, by manipulating the light polarization state. More importantly, by time -resolved PEEM measurements, we experimentally demonstrate that the quadrupole mode in symmetrical Au nanoblocks has longer dephasing time than that of the dipole mode.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据