期刊
NANO LETTERS
卷 10, 期 8, 页码 3090-3095出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl1017173
关键词
Plasmonics; nanoparticle; dimer
类别
资金
- Robert A. Welch Foundation [C-1220, C-1222]
- Basque Government (BC)
- Spanish MICINN [FIS2007-066711-C02-00]
- BG-UPV/EHU [IT-366-07]
- CUBiHOLE [EUI2008-03816]
The optical properties of a nanoparticle dimer bridged by a conductive junction depend strongly on the junction conductivity. As the conductivity increases, the bonding dimer plasmon blueshifts and broadens. For large conductance, a low energy charge transfer plasmon also appears in the spectra with a line width that decreases with increasing conductance. A simple physical model for the understanding of the spectral feature is presented. Our finding of a strong influence of junction conductivity on the optical spectrum suggests that plasmonic cavities might serve as probes of molecular conductance at elevated frequencies not accessible through electrical measurements.
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