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Detection of Plasmon Coupling between Silver Nanowires Based on Hyperspectral Darkfield and SERS Imaging and Supported by DDA Theoretical Calculations
Author(s) -
Santos Jonnatan J.,
Ivanov Evandro,
dos Santos Diego P.,
Toma Henrique E.,
Corio Paola
Publication year - 2016
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201501051
Subject(s) - hyperspectral imaging , raman scattering , plasmon , discrete dipole approximation , nanowire , raman spectroscopy , materials science , hot spot (computer programming) , molecular physics , microscopy , optics , rhodamine , spectral line , coupling (piping) , optoelectronics , scattering , chemistry , physics , remote sensing , astronomy , computer science , fluorescence , geology , operating system , metallurgy
Abstract 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.