The phase-response effect of size-dependent optical enhancement in a single nanoparticle.
We demonstrate detailed simulations and experiments of near-field phase-response in a single silver nanoparticle. The plasmon-photon interaction is directly observed in the vicinity of silver nanoparticles through a near-field scanning optical microscope (NSOM). Our results manifest the correlation of phase-response and size-dependent optical enhancement. Detailed interference behaviors between optical excitation and plasmon mediated re-radiation are revealed on a single particle basis. This observation facilitates nano-applications in controlling the spatial distribution of surface plasmon (SP) modes by means of nanostructures.
Institute of Electro-Optical Science and Engineering, National Cheng Kung University, No.1, University Road, Tainan 701, Taiwan.
Chen-Han
CH
Huang
Hsing-Ying
HY
Lin
Cheng-Hsiang
CH
Lin
Hsiang-Chen
HC
Chui
Yun-Chiang
YC
Lan
Shi-Wei
SW
Chu
D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D020527:Microscopy, Scanning Probe / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000379:methods*
D012834:Silver