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Plasmonics of multifaceted metallic nanoparticles, field enhancement, and TERS (Phys. Status Solidi B 1/2015)
Author(s) -
Noguez Cecilia,
Villagómez Carlos J.,
González Ana L.
Publication year - 2015
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201570301
Subject(s) - plasmon , raman spectroscopy , nanoparticle , materials science , electromagnetic field , nanotechnology , nanometre , scanning electron microscope , excitation , near and far field , field (mathematics) , plasmonic nanoparticles , optoelectronics , optics , physics , mathematics , quantum mechanics , pure mathematics , composite material
Metal nanoparticles exhibit remarkable physical and chemical properties that are morphology‐dependent, their optical response being of particular interest. It has been shown that the optical properties of the nanoparticles are pronounced morphology‐dependent, i.e. can be controlled by changing shape and size. Metal nanoparticles strongly couple with light through the excitation of surface plasmon resonances, leading to novel phenomena at the nanometer scale, including localization and consequent enhancement of the electromagnetic field (see the Feature Article by Noguez et al., pp. 56–71 ). For producing the strongest local electromagnetic field enhancement at a given frequency, it is necessary to rationalize which parameters are or are not important to modify. This electron confinement and squeezing of the electromagnetic field in small regions near the nanoparticles can be manipulated for a significant increase of the sensitivity of spectroscopies. In recent years the utilization of scanning probe microscopy has been proposed to significantly increase the weak Raman signal from few molecules deposited on a substrate. Here the microscopy metallic tip acts as a plasmonic nanoantenna that amplifies the Raman signals by several orders of magnitude. This technique has been called tip‐enhanced Raman spectroscopy or TERS.