Surface-plasmon resonances in single metallic nanoparticles
Surface-plasmon resonances in single metallic nanoparticles
复制标题
DOI：
10.1103/physrevlett.80.4249
复制
发表时间：
1998-05-11
影响因子：
8.6
通讯作者：
Feldmann, J
中科院分区：
文献类型：
--
作者：
Klar, T;Perner, M;Feldmann, J
利用近场光学天线效应，我们测量了单个金纳米粒子表面等离子体共振的均匀线形。从单个粒子的近场光谱中提取的表面等离子激元退相时间约为8fs。这一平均值与忽略表面效应的基于Mie理论的计算结果相吻合。个别颗粒偏离此值的原因被解释为局部纳米环境的变化。我们还观察到了由近邻粒子之间的电磁耦合引起的双峰线形状。
Using a near-field optical antenna effect, we measure the homogeneous line shape of the surface-plasmon resonance in single gold nanoparticles. The surface-plasmon dephasing times extracted from the near-field spectra of the individual particles vary around 8 fs. This mean value agrees with calculations based on Mie theory, which neglect surface effects. Deviations of individual particles from this value an interpreted as being due to variations in the local nanoenvironment. We also observe double-peaked line shapes caused by electromagnetic coupling between close-lying particles.