Journal
NANO LETTERS
Volume 9, Issue 10, Pages 3619-3625Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl901839f
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Funding
- Korean government (MEST) [R11-2008-095-01000-0, R01-2008-000-12194-0, M1070300103208M030003211, R11-2008-052-02003]
- Korea Research Institute of Science and Standard (KRISS) [40003010.02]
- KRCF
- Korea Food & Drug Administration [08162KF-DA550]
- National Research Foundation of Korea [R01-2008-000-12194-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We carried out the near-field optical imaging of isolated and dimerized gold nanocubes to directly investigate the strong coupling between two adjacent nanoparticles. The high-resolution (similar to 10 nm) local field maps (intensities and phases) of self-assembled nanocube dimers reveal antisymmetric plasmon modes that are starkly different from a simple superposition of two monomeric dipole plasmons, which is fully reproduced by the electrodynamics simulations, The result decisively proves that, for the closely spaced pair of nanoparticles (interparticle distance/particle size similar to 0.04), the strong Coulombic attraction between the charges at the interparticle gap dominates over the Intraparticle charge oscillations, resulting in a hybridized dimer plasmon mode that is qualitatively different from those expected from a simple dipole-dipole coupling model.
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