期刊
OPTICS EXPRESS
卷 17, 期 8, 页码 6407-6413出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.17.006407
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资金
- State Key Program for Basic Research of China [2004CB619003, 2006CB921804]
- National Natural Science Foundation of China [10523001, 10804051, 10874079, 60606020]
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
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