title: Spectral variations in background light emission of surface-enhanced resonance hyper Raman scattering coupled with plasma resonance of individual silver nanoaggregates.
abstract: We demonstrate the origin of spectral variations in background light emission of surface enhanced resonance hyper Raman scattering (SERHRS) from single Ag nanoaggregates. Ag nanoaggregate-by-nanoaggregate variations in background light emission spectra are related to plasma (plasmon) resonance spectra. Temporal variations in background light emission spectra with temporal blueshifts in plasma resonance spectra are also observed under continuous laser excitation. Both types of the variations in background light emission are reproduced by multiplying background light emission spectra measured from a Ag microaggregate by Lorentz function spectra derived from plasma resonance spectra. The reproduction reveals that second electromagnetic (EM) enhancement by plasma resonance is the origin of the variations. Additionally, spectral variations in background light emission of SERHRS are similar to that of surface enhanced resonance Raman scattering (SERRS). The similarity indicates that both types of background light emission commonly obtain second EM enhancement from identical plasma resonance.
authors.affiliation: Nano-Bioanalysis Group, Health Technology Research Institute (HTRI), National Institute of Advanced Industrial Science and Technology (AIST), Takamatsu, Kagawa 761-0395, Japan.
authors.forename: Tamitake
authors.initials: T
authors.lastname: Itoh
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yoshikawa
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Yoshida
authors.forename: Vasudevanpillai
authors.initials: V
authors.lastname: Biju
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Ishikawa
mesh_terms: D053768:Metal Nanoparticles; D012834:Silver; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties; D013997:Time Factors
chemical_list: D012834:Silver