期刊
NANO LETTERS
卷 12, 期 9, 页码 5020-5026出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl302799h
关键词
Nanocluster; plasmon; electron beam-induced deposition (EBID); carbon nanoparticle (CNP); Fano resonance; magnetic mode
类别
资金
- Robert A. Welch Foundation [C-1220, C-1222]
- National Security Science and Engineering Faculty Fellowship (NSSEFF) [N00244-09-1-0067]
- Defense Threat Reduction Agency (DTRA) [HDTRA1-11-1-0040]
- Air Force Office of Scientific Research (AFOSR) [FA9550-10-1-0469]
- FWO of Flanders
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1040478] Funding Source: National Science Foundation
Planar clusters of coupled plasmonic nanoparticles support nanoscale electromagnetic hot spots and coherent effects, such as Fano resonances, with unique near and far field signatures, currently of prime interest for sensing applications. Here we show that plasmonic cluster properties can be substantially modified by the addition of individual, discrete dielectric nanoparticles at specific locations on the cluster, introducing new plasmon modes, or transmuting existing plasmon modes to new ones, in the resulting metallodielectric nanocomplex. Depositing a single carbon nanoparticle in the junction between a pair of adjacent nanodisks induces a metal dielectric metal-quadrupolar-plasmon mode. In a ten-membered cluster, placement of several carbon nanoparticles in junctions between multiple adjacent nanoparticles introduces a collective magnetic plasmon mode into the Fano dip, giving rise to an additional subradiant mode in the metallodielectric nanocluster response. These examples illustrate that adding dielectric nanoparticles to metallic nanoclusters expands the number and types of plasmon modes supported by these new mixed-media nanoscale assemblies.
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