We report the unprecedented observation of plasmon coupling between silver nanowires, showing how the surface-enhanced Raman scattering depends upon this interaction and how the spectrum can be shaped by the hot spot. Such observations were accomplished by Raman spectroscopy mapping of silver nanowires modified with rhodamine. The local spectra on the hot spots were measured by darkfield hyperspectral microscopy, a powerful but uncommonly used technique that is capable of determining the location, structure, and spectra of the hot spots. The result obtained by the simulation of two parallel nanowires based on the discrete dipole approximation (DDA) method was in excellent agreement with the results obtained experimentally.
Coupling between two silver nanowires is observed by using Raman spectroscopy mapping, which can be used to detect the resulting hot spots. These experimentally obtained results compare well with the spectra calculated by dipole discrete approximation. More information can be found in the Communication by P. Corio et al. on page 463 in Issue 4 2016 (DOI: 10.1002/cphc.201501051).
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