Visualization of localized intense optical fields in single gold-nanoparticle assemblies and ultrasensitive Raman active sites.
We demonstrate visualization of localized intense electromagnetic fields in real space in well-tailored dimeric and trimeric gold nanospheres by using near-field optical techniques. With two-photon induced luminescence and Raman measurements, we show that the electric field is confined at an interstitial site in the aggregate. We also demonstrate optical switching operations for the electric-field localized sites in the trimer structure.
Imura
Kohei
K
Institute for Molecular Science and The Graduate University for Advanced Studies, Okazaki, Aichi 444-8585, Japan.
Okamoto
Hiromi
H
Hossain
Mohammad K
MK
Kitajima
Masahiro
M
D004574:Electromagnetic Fields; D006046:Gold / Q000737:chemistry*; D007089:Image Enhancement / Q000379:methods*; D008027:Light; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D012680:Sensitivity and Specificity; D013059:Spectrum Analysis, Raman / Q000379:methods*
D006046:Gold