Observation of hot-electron pressure in the vibration dynamics of metal nanoparticles

被引：204

作者：

Perner, M

Gresillon, S

März, J

von Plessen, G

Feldmann, J

Porstendorfer, J

Berg, KJ

Berg, G

机构：

[1] Univ Munich, Lehrstuhl Photon & Optoelekt, Sekt Phys, D-80799 Munich, Germany

[2] Univ Munich, CeNS, D-80799 Munich, Germany

[3] Univ Halle Wittenberg, Fachbereich Phys, D-06108 Halle, Germany

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.85.792

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the vibration dynamics of ellipsoidal silver nanoparticles, using time-resolved optical pump-probe spectroscopy. When excited with femtosecond laser pulses, the particles execute anisotropic shape oscillations. We show that these vibrations are triggered by the thermal expansion of the optically heated particles. The time dependence of the vibrations indicates that this expansion is caused by two mechanisms: The lattice anharmonicity and the extremely large pressure of the hot conduction electrons.

引用

页码：792 / 795

页数：4

共 17 条

[1] THERMAL-EXPANSION OF SOLIDS AT LOW-TEMPERATURES [J].