Split of surface plasmon resonance of gold nanoparticles on silicon substrate: a study of dielectric functions

The split of surface plasmon resonance of self-assembled gold nanoparticles on Si substrate is observed from the dielectric functions of the nanoparticles. The split plasmon resonances are modeled with two Lorentz oscillators: one oscillator at ~1 eV models the polarization parallel to the substrate...

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Bibliographic Details
Published in:Optics express 2010-10, Vol.18 (21), p.21926-21931
Main Authors: Zhu, S, Chen, T P, Cen, Z H, Goh, E S M, Yu, S F, Liu, Y C, Liu, Y
Format: Article
Language:English
Subjects:
Absorption
Gold - chemistry
Metal Nanoparticles - chemistry
Metals - chemistry
Models, Statistical
Nanoparticles - chemistry
Optics and Photonics
Oscillometry - methods
Particle Size
Silicon - chemistry
Surface Plasmon Resonance - methods
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Summary:The split of surface plasmon resonance of self-assembled gold nanoparticles on Si substrate is observed from the dielectric functions of the nanoparticles. The split plasmon resonances are modeled with two Lorentz oscillators: one oscillator at ~1 eV models the polarization parallel to the substrate while the other at ~2 eV represents the polarization perpendicular to the substrate. Both parallel and perpendicular resonances are red-shifted when the nanoparticle size increases. The red shifts in both resonances are explained by the image charge effect of the Si substrate.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.18.021926