Collective Excitations and Dielectric Function of Self-Assembled Gold Nanoparticles on a Silicon Substrate

被引：6
作者：
Zhu, S. [1 ]
Chen, T. P. [1 ]
Cen, Z. H. [1 ]
Liu, Y. C. [2 ]
Liu, Y. [3 ]
机构：
[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
[2] Singapore Inst Mfg Technol, Singapore 638075, Singapore
[3] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Peoples R China
来源：
ELECTROCHEMICAL AND SOLID STATE LETTERS | 2010年 / 13卷 / 05期
基金：
新加坡国家研究基金会;
关键词：
band structure; dielectric function; ellipsometry; gold; nanoparticles; plasmons; self-assembly; SURFACE-PLASMON RESONANCE; OPTICAL-PROPERTIES; AU NANOPARTICLES; RAMAN-SCATTERING; THIN-FILMS; ENHANCEMENT; FABRICATION; SHAPE; SIZE;
D O I：
10.1149/1.3329540
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The optical properties of self-assembled gold nanoparticles on silicon substrate have been determined using ellipsometric analysis. The dielectric function of the nanoparticles is best represented by a Drude term and three Lorentz oscillators with the resonance energies at 1.26, 2.22, and 3.65 eV. The Lorentz oscillator at 3.65 eV is due to the interband transitions, while the other two oscillators are attributed to the splitting of the plasmon resonance of the spatially limited free electrons inside the nanoparticles. The splitting of plasmon resonance could be due to the influence of various factors such as the near-field interactions of adjacent nanoparticles, image effects of the substrate, imperfect spherical shapes of the nanoparticles, etc.
引用
收藏
页码：K39 / K42
页数：4
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