Journal
NANO LETTERS
Volume 15, Issue 5, Pages 3391-3397Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00734
Keywords
plasmonic coupling; field-distribution; dimer; Au-nanocube; Ag-nanocube; DDA
Categories
Funding
- NSF [DMR-1206637]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1206637] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0906822] Funding Source: National Science Foundation
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Using the DDA method, We investigated the near-field coupling between two excited Au Or As 42 nm nanocubes in a face-to-face dimer configuration at Small separation distances where the exponential coupling behavior distinctly changes. This could be due to the failure of the dipole approximation at short distances or a change in the electromagnetic field distribution between the adjacent monomers. A detailed calculation of the plasmonic field distribution Strongly suggests that the latter Mechanism is responsible for the failure of the expected exponential coupling, behavior at small separation distances. The results suggest that the observed optical properties of the pair of Au or Ag nanocubes separated by distances larger than 6 nm, result from the electromagnetic coupling between the oscillating dipoles at the corners of the adjacent facets of the nanocubes. At separations smaller than 6 nm, the distribution of the plasmonic dipoles along,both the facets and the corners of the adjacent monomers control the plasmonic spectra and the distance dependent optical properties of the dimer.
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