Study of plasmon resonance in a gold nanorod with an LC circuit model

Details 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

2009-03-21

arxiv.org/abs/0903.3661v1

Optics Express 17, 6407 (2009)

Physics

Optics

15 pages, 3 figures

Scientific paper

10.1364/OE.17.006407

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 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.

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