Near-field Raman imaging and electromagnetic field confinement in the self-assembled monolayer array of gold nanoparticles.
Spatial distribution of surface enhanced Raman activity is visualized for two-dimensional (2D) nearly close-packed and well-ordered monolayer array of gold nanoparticles by using scanning near-field optical microscope. The 2D arrays exhibit highly nonuniform enhancement in Raman scattering, i.e., the regions along the edge of the 2D array are preferentially enhanced. We demonstrate that the spatial distribution of the localized electric field is also nonuniform and agrees well with that of the Raman enhancement.
Hossain
Mohammad Kamal
MK
Department of Applied Physics, National Defense Academy, Yokosuka, Kanagawa 239-0811, Japan.
Shimada
Toru
T
Kitajima
Masahiro
M
Imura
Kohei
K
Okamoto
Hiromi
H