期刊
ACS NANO
卷 4, 期 8, 页码 4657-4666出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn1011144
关键词
gold nanorods; surface plasmon resonance; nanoparticle dimers; plasmon hybridization; single-particle spectroscopy; plasmon coupling
类别
资金
- Robert A. Welch Foundation [C-1664, C-1222]
- NSF [CHE-0955286]
- U.S. Department of Energy
- NSF IGERT
- 3M
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0955286] Funding Source: National Science Foundation
We have explored the consequences of symmetry breaking on the coupled surface plasmon resonances in individual dimers of gold nanorods using single-particle dark-field scattering spectroscopy and numerical simulations. Pairs of chemically grown nanorods can exhibit wide variation in sizes, gap distances, and relative orientation angles. The combination of single-particle spectroscopy and theoretical analysis allowed us to discern the effects of specific asymmetry-inducing parameters one at a time. The dominant influence of symmetry breaking occurred for longitudinal resonances in strongly coupled nanorods in linear end-to-end configurations. In particular, we found that the normally dark antibonding dimer mode becomes visible when the sizes of the two nanorods are different. In addition, we observed a conductively coupled plasmon mode that was red-shifted by at least 250 nm from the bonding plasmon mode for the corresponding nontouching geometry. Gaining detailed insight into how symmetry breaking influences coupled surface plasmon resonances of individual nanorod dimers is an important step toward the general understanding of the optical properties of assemblies of chemically synthesized nanorods with unavoidable irregularities in size and orientation.
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