Drastic reduction of plasmon damping in gold nanorods -: art. no. 077402
Drastic reduction of plasmon damping in gold nanorods -: art. no. 077402
复制标题
DOI：
10.1103/physrevlett.88.077402
复制
发表时间：
2002-02-18
影响因子：
8.6
通讯作者：
Mulvaney, P
中科院分区：
文献类型：
--
作者：
Sönnichsen, C;Franzl, T;Mulvaney, P
粒子等离子体的退相研究使用单个金纳米粒子的光散射光谱。我们发现，由于抑制带间阻尼，纳米棒中的等离子体激元退相速率与小纳米球相比急剧降低。这里研究的棒也显示出非常小的辐射阻尼，由于它们的体积小。这些发现意味着大的局部场增强因子和相对较高的光散射效率，使金属纳米棒在光学应用中非常有趣。与理论比较表明，纯退相和界面阻尼的总等离子体激元退相率的贡献可以忽略不计。
The dephasing of particle plasmons is investigated using light-scattering spectroscopy on individual gold nanoparticles. We find a drastic reduction of the plasmon dephasing rate in nanorods as compared to small nanospheres due to a suppression of interband damping. The rods studied here also show very little radiation damping, due to their small volumes. These findings imply large local-field enhancement factors and relatively high light-scattering efficiencies, making metal nanorods extremely interesting for optical applications. Comparison with theory shows that pure dephasing and interface damping give negligible contributions to the total plasmon dephasing rate.