Surface plasmon assisted photoemission from Au nanoparticles on graphite
Surface plasmon assisted photoemission from Au nanoparticles on graphite
复制标题
DOI：
10.1007/s003400100713
复制
发表时间：
2001-09-01
影响因子：
2.1
通讯作者：
Pfeiffer, W
中科院分区：
文献类型：
--
作者：
Kennerknecht, C;Hövel, H;Pfeiffer, W
使用超短激光脉冲对金属纳米粒子中的集体模式进行共振多重激发，导致粒子的多光子光发射增强。这里通过石墨上金纳米颗粒的表面等离子体共振证明了这种效应。光电子发射光谱的形状可以通过纳米颗粒的多光子光辅助热电子发射和通过石墨上的图像势态的共振发射来解释。将光子能量调节在 1.7 eV 和 3.2 eV 之间，可以识别出 2.1 +/- 0.1-eV 光子能量下光电发射产率的增强，这归因于金纳米粒子中表面等离子体激元的共振激发。电子能量损失光谱也支持该能量范围内表面等离子体激元激发的识别。
The resonant multiple excitation of collective modes in metallic nanoparticles using ultrashort laser pulses leads to an enhanced multiphoton photoemission from the particles. This effect is here demonstrated for the surface-plasmon resonance of Au nanoparticles on graphite. The shape of the photoemission spectra is explained by multiphoton photo-assisted thermionic emission from the nanoparticles and resonant emission via the image-potential state on graphite. Tuning the photon energy between 1.7 eV and 3.2 eV allows the identification of an enhancement of the photoemission yield at 2.1 +/- 0.1-eV photon energy that is attributed to the resonant excitation of the surface plasmon in the Au nanoparticles. This identification of the surface-plasmon excitation in this energy range is also supported by electron energy loss spectroscopy.