Unraveling near-field origin of electromagnetic waves scattered from silver nanorod arrays using pseudo-spectral time-domain calculation.
In this study, we report the investigation of both near- and far-field electromagnetic characteristics of two-dimensional silver nanorod arrays embedded in anodic aluminum oxide with the use of a high-accuracy three-dimensional Legendre pseudospectral time-domain scheme. The simulated far-field scattering spectra agree with the experimental observations. We show that enhanced electric field is created between adjacent nanorods and, most importantly, far-field scattered light wave is mainly contributed from surface magnetic field, instead of the surface enhanced electric field. The identified near-field to far-field connection produces an important implication in the development of efficient surface-enhanced Raman scattering substrates.
Lin
Bang-Yan
BY
Graduate Institute of Communication Engineering, National Taiwan University, Taipei, Taiwan, ROC.
Hsu
Hui-Chen
HC
Teng
Chun-Hao
CH
Chang
Hung-Chun
HC
Wang
Juen-Kai
JK
Wang
Yuh-Lin
YL
D000465:Algorithms; D004574:Electromagnetic Fields; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D012542:Scattering, Radiation; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000379:methods*
D012834:Silver