Study of Electron-Phonon Coupling Dynamics in Au Nanorods by Transient Depolarization Measurements

被引：41

作者：

Jiang, Ying ^{[1
]}

Wang, Hai-Yu ^{[1
]}

Xie, Li-Ping ^{[1
]}

Gao, Bing-Rong ^{[1
]}

Wang, Lei ^{[1
,2
]}

Zhang, Xu-Lin ^{[1
]}

Chen, Qi-Dai ^{[1
]}

Yang, Han ^{[1
]}

Song, Hong-Wei ^{[1
]}

Sun, Hong-Bo ^{[1
,2
]}

机构：

[1] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China

[2] Jilin Univ, Coll Phys, Changchun 130023, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 07期

关键词：

GOLD NANORODS; COHERENT EXCITATION; ULTRAFAST DYNAMICS; OPTICAL-PROPERTIES; SURFACE-PLASMONS; NANOPARTICLES; RELAXATION; FEMTOSECOND; PARTICLES; SPECTROSCOPY;

D O I：

10.1021/jp9108656

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electron-phonon (e-ph) coupling dynamics in Au nanorods are studied with femtosecond transient depolarization experiments. Au nanorods exhibit strongly anisotropic e-ph coupling dynamics. It is considered to arise from different weights of pump energy assigned to two polarization directions because of the anisotropy of Au nanorods rather than because of an intrinsic process. The e-ph Coupling kinetics measured by transient experiments cannot be simply described by a single exponential function but by the integral of components contributed by random distribution of Au nanorods at all directions in aqueous Solution. After this correction, the relationship between electron-phonon relaxation times and Pump power is linear even in relatively high power. The time extrapolated to zero intensity is 0.75 ps, which is similar to the characteristic electron-phonon Coupling time for nanodots and bulk Au.

引用

页码：2913 / 2917

页数：5