Fano Resonances in Plasmonic Nanoclusters: Geometrical and Chemical Tunability
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- 作者：J. Britt Lassiter ; Heidar Sobhani ; Jonathan A. Fan ; Janardan Kundu ; Federico Capasso ; Peter Nordlander ; Naomi J. Halas
- 刊名：Nano Letters
- 出版年：2010
- 出版时间：August 11, 2010
- 年：2010
- 卷：10
- 期：8
- 页码：3184-3189
- 全文大小：421K
- 年卷期：v.10,no.8(August 11, 2010)
- ISSN：1530-6992
文摘
Clusters of plasmonic nanoparticles and nanostructures support Fano resonances. Here we show that this spectral feature, produced by the interference between bright and dark modes of the nanoparticle cluster, is strongly dependent upon both geometry and local dielectric environment. This permits a highly sensitive tunability of the Fano dip in both wavelength and amplitude by varying cluster dimensions, geometry, and relative size of the individual nanocluster components. Plasmonic nanoclusters show an unprecedented sensitivity to dielectric environment with a local surface plasmon resonance figure of merit of 5.7, the highest yet reported for localized surface plasmon resonance sensing in a finite nanostructure.