Journal
NANO LETTERS
Volume 10, Issue 8, Pages 3184-3189Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl102108u
Keywords
Plasmon; Fano resonance; nanocluster; coherent phenomena; localized surface plasmon resonance (LSPR); sensing figure of merit (FoM)
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Funding
- Robert A. Welch Foundation [C-1220, C-1222]
- Department of Defense National Security Science and Engineering [N00244-09-0067]
- Center for Advanced Solar Photo-physics
- U.S. Department of Energy
- NSF NIRT [0709323]
- NSF [EIA-0216467]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0709323] Funding Source: National Science Foundation
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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.
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