title: Detection of Plasmon Coupling between Silver Nanowires Based on Hyperspectral Darkfield and SERS Imaging and Supported by DDA Theoretical Calculations.
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.
authors.affiliation: Institute of Chemistry, University of Sao Paulo, Av. Prof. Lineu Prestes, 748, Cidade Universitaria, Sao Paulo-SP, 05508000, Brazil.
authors.forename: Jonnatan J
authors.initials: JJ
authors.lastname: Santos
authors.affiliation: Institute of Chemistry, University of Sao Paulo, Av. Prof. Lineu Prestes, 748, Cidade Universitaria, Sao Paulo-SP, 05508000, Brazil.
authors.forename: Evandro
authors.initials: E
authors.lastname: Ivanov
authors.affiliation: Institute of Chemistry, University of Campinas, Barao Geraldo, Campinas-SP, 13083970, Brazil.
authors.forename: Diego P
authors.initials: DP
authors.lastname: dos Santos
authors.affiliation: Institute of Chemistry, University of Sao Paulo, Av. Prof. Lineu Prestes, 748, Cidade Universitaria, Sao Paulo-SP, 05508000, Brazil.
authors.forename: Henrique E
authors.initials: HE
authors.lastname: Toma
authors.affiliation: Institute of Chemistry, University of Sao Paulo, Av. Prof. Lineu Prestes, 748, Cidade Universitaria, Sao Paulo-SP, 05508000, Brazil. paola@iq.usp.br.
authors.forename: Paola
authors.initials: P
authors.lastname: Corio
keywords: DDA calculations; SERS; darkfield/hyperspectral microscopy; plasmon coupling; silver nanowires