Nano-Optical Investigation of Enhanced Field at Gold Nanosphere-Gold Plane Junctions

Bulletin of the Korean chemical society

Zee Hwan Kim¹  Won-Hwa Park¹  Sung-Hyun Ahn¹ 

关键词: Surface plasmons;    Surface-enhanced Raman scattering;    Finite-difference time-domain method;    Metal nanoparticles;    Dipole-coupling;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

The local field distribution around gold nanosphere-gold plane junction has been studied using the finitedifference time-domain (FDTD) electrodynamics calculation procedure. We find that both the in-plane and out-of-plane polarized excitation produce enhanced field strong enough to explain the observed SERS activities of the junctions. Comparison with a simple dipole-image dipole model shows that the enhanced field primarily originates from the multipole-image multipole interaction, which indicates that the detailed fine-structures of the nanoparticles also play a significant role in the SERS activities as well.

【 授权许可】

Unknown