等离子体子
材料科学
金属
二聚体
纳米结构
激发
局域表面等离子体子
光电子学
表面等离子共振
表面等离子体子
纳米技术
化学
纳米颗粒
物理
有机化学
冶金
量子力学
作者
Burak Gerislioglu,Liangliang Dong,Arash Ahmadivand,Huatian Hu,Peter Nordlander,Naomi J. Halas
出处
期刊:Nano Letters
[American Chemical Society]
日期:2020-01-28
卷期号:20 (3): 2087-2093
被引量:100
标识
DOI:10.1021/acs.nanolett.0c00075
摘要
Dimers, two closely spaced metallic nanostructures, are one of the primary nanoscale geometries in plasmonics, supporting high local field enhancements in their interparticle junction under excitation of their hybridized "bonding" plasmon. However, when a dimer is fabricated on a metallic substrate, its characteristics are changed profoundly. Here we examine the properties of a Au dimer on a Au substrate. This structure supports a bright "bonding" dimer plasmon, screened by the metal, and a lower energy magnetic charge transfer plasmon. Changing the dielectric environment of the dimer-on-film structure reveals a broad family of higher-order hybrid plasmons in the visible region of the spectrum. Both of the localized surface plasmons resonances (LSPR) of the individual dimer-on-film structures as well as their collective surface lattice resonances (SLR) show a highly sensitive refractive index sensing response. Implementation of such all-metal magnetic-resonant nanostructures offers a promising route to achieve higher-performance LSPR- and SLR-based plasmonic sensors.
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