Femtosecond multicolor transient absorption spectroscopy of colloidal silver nanoparticles

被引：11

作者：

Gaal, A. ^{[1
]}

Bugar, I. ^{[1
,2
]}

Capek, I. ^{[3
]}

Fialova, L. ^{[3
]}

Palszegi, T. ^{[4
]}

Szocs, V. ^{[5
]}

Satka, A. ^{[2
]}

Uherek, F. ^{[2
]}

机构：

[1] Comenius Univ, Fac Math Phys & Informat, Bratislava 84248, Slovakia

[2] Ctr Int Laser, Bratislava 84104, Slovakia

[3] Slovak Acad Sci, Inst Polymer, Bratislava 84236, Slovakia

[4] Slovak Acad Sci, Inst Technol, Bratislava 84513, Slovakia

[5] Comenius Univ, Fac Nat Sci, Bratislava 84215, Slovakia

来源：

LASER PHYSICS | 2009年 / 19卷 / 05期

关键词：

SURFACE-PLASMON RESONANCE; ULTRAFAST ELECTRON DYNAMICS; METAL NANOPARTICLES; GOLD; NONLINEARITIES; NANOCRYSTALS; RELAXATION; DEPENDENCE; PARTICLES; CLUSTERS;

D O I：

10.1134/S1054660X09050120

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Time-resolved femtosecond multicolor absorption spectroscopy of silver nanoparticle (NP) colloids with particle diameter in range of 10-30 nm is presented. The amplified femtosecond excitation of the surface plasmon resonance band resulted in transient absorption spectra reflecting the electron-phonon relaxation dynamics, which takes place on the early picosecond time scale. The monitored band with enhanced absorption in the 490-540 nm spectral range exhibited red-shift with increasing pump fluency from 0.4 mJ/cm(2) to the 1.5 mJ/cm(2) level. The growth of the relaxation time with increasing pump fluency reveals the temperature dependent relaxation dynamics caused by the nanometer sized electron confinement in the case of silver. This effect was confirmed also by identification of the relaxation time dependence on the particle diameter at constant pump fluency. The complex experimental results revealed nonlinearities both in the laser excitation and electron relaxation processes.

引用

页码：961 / 968

页数：8

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