Metallic nanoparticle arrays: a common substrate for both surface-enhanced Raman scattering and surface-enhanced infrared absorption.
Nanoshell arrays have recently been found to possess ideal properties as a substrate for combining surface enhanced raman scattering (SERS) and surface enhanced infrared absorption (SEIRA) spectroscopies, with large field enhancements at the same spatial locations on the structure. For small interparticle distances, the multipolar plasmon resonances of individual nanoshells hybridize and form red-shifted bands, a relatively narrow band in the near-infrared (NIR) originating from quadrupolar nanoshell resonances enhancing SERS, and a very broadband in the mid-infrared (MIR) arising from dipolar resonances enhancing SEIRA. The large field enhancements in the MIR and at longer wavelengths are due to the lightning-rod effect and are well described with an electrostatic model.
Le
Fei
F
Department of Physics and Astronomy, M.S. 61, Rice University Houston, Texas 77005, USA.
Brandl
Daniel W
DW
Urzhumov
Yaroslav A
YA
Wang
Hui
H
Kundu
Janardan
J
Halas
Naomi J
NJ
Aizpurua
Javier
J
Nordlander
Peter
P
D003198:Computer Simulation; D007259:Infrared Rays; D008027:Light; D046911:Macromolecular Substances / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D008956:Models, Chemical; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D012542:Scattering, Radiation; D013055:Spectrophotometry, Infrared / Q000379:methods*; D020349:Surface Plasmon Resonance / Q000379:methods*; D013499:Surface Properties
D046911:Macromolecular Substances; D008670:Metals