硅基衬底上金纳米颗粒表面等离子体共振的分裂：介电函数的研究

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

作者信息

Zhu S, Chen T P, Cen Z H, Goh E S M, Yu S F, Liu Y C, Liu Y

机构信息

School of Electrical and Electronics Engineering, Nanyang Technological University, 639798 Singapore.

出版信息

Opt Express. 2010 Oct 11;18(21):21926-31. doi: 10.1364/OE.18.021926.

DOI:10.1364/OE.18.021926

PMID:20941092

Abstract

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.

摘要

从自组装在硅衬底上的金纳米颗粒的介电函数中观察到表面等离子体共振的分裂。分裂的等离子体共振用两个洛伦兹振子进行建模：一个约1 eV的振子模拟平行于衬底的极化，而另一个约2 eV的振子代表垂直于衬底的极化。当纳米颗粒尺寸增加时，平行和垂直共振都会发生红移。两种共振中的红移都由硅衬底的镜像电荷效应来解释。