Detection of Plasmon Coupling between Silver Nanowires Based on Hyperspectral Darkfield and SERS Imaging and Supported by DDA Theoretical Calculations

• Published in: Chemphyschem Vol. 17; no. 4; pp. 463 - 467
• Main Authors: Santos, Jonnatan J., Ivanov, Evandro, dos Santos, Diego P., Toma, Henrique E., Corio, Paola
• Format: Journal Article
• Language: English
• Published: Germany Blackwell Publishing Ltd 16.02.2016; Wiley Subscription Services, Inc
• Subjects: darkfield/hyperspectral microscopy; DDA calculations; Nanowires; plasmon coupling; SERS; silver nanowires; Spectrum analysis; silver nanowires; DDA calculations; plasmon coupling; darkfield/hyperspectral microscopy; SERS
• ISSN: 1439-4235; 1439-7641
• DOI: 10.1002/cphc.201501051

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 silver nanowires: The observation of plasmon coupling between silver nanowires is reported. The authors demonstrate that the surface‐enhanced Raman scattering depends on this interaction—and that the spectrum can be shaped by the hot spot.