Study of plasmon resonance in a gold nanorod with an LC circuit model
Study of plasmon resonance in a gold nanorod with an LC circuit model
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用 LC 电路模型研究金纳米棒中的等离激元共振
DOI：
10.1364/oe.17.006407
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发表时间：
2009-04-13
期刊：
影响因子：
3.8
通讯作者：
Zhu, Yong-yuan
中科院分区：
文献类型：
--
作者：
Huang, Cheng-ping;Yin, Xiao-gang;Zhu, Yong-yuan
金纳米棒由于其可调谐的纵向等离子体共振而引起了人们极大的研究兴趣。然而，对这一效应的理解进展甚微。一个主要原因是，除了金属球体和椭球体外，光与纳米颗粒之间的相互作用通常是不可溶的。本文提出了一种研究金纳米棒等离激元共振的新方案，将纳米棒模拟为具有电感和电容的LC电路。得到的共振波长不仅与长径比有关，还与棒半径有关，这表明了自感效应和线性标度击穿的重要性。此外，还对光的散射和吸收截面进行了解析推导，得到了消光光谱的洛伦兹线形。这一结果为我们提供了对这一现象的新见解。(C)2009年美国光学学会
Gold nanorod has generated great research interest due to its tunable longitudinal plasmon resonance. However, little progress has been made in the understanding of the effect. A major reason is that, except for the metallic spheres and ellipsoids, the interaction between light and nanoparticles is generally insoluble. In this paper, a new scheme has been proposed to study the plasmon resonance of gold nanorod, in which the nanorod is modeled as an LC circuit with an inductance and a capacitance. The obtained resonance wavelength is dependent on not only aspect ratio but also rod radius, suggesting the importance of self-inductance and the breakdown of linear scaling. Moreover, the cross sections for light scattering and absorption have been deduced analytically, giving rise to a Lorentzian line-shape for the extinction spectrum. The result provides us with new insight into the phenomenon. (C) 2009 Optical Society of America