FDTD simulation study of size/gap and substrate-dependent SERS activity study of Au@SiO2 nanoparticles
Yang Jing-Liang, Li Ruo-Ping, Han Jun-He, Huang Ming-Ju†, 
SEM images of Au@SiO2 NPs with shell thickness of (a) 50 nm, (b) 35 nm, (c) 15 nm, and (d) 3 nm, and corresponding SERS spectra of Rh6G molecule adsorbed in the gap between Au@ SiO2 NPs. Laser: 632.8 nm, 20 mW.
