Femtosecond nonlinear birefringence and nonlinear dichroism in Au:TiO2 composite films

被引：20

作者：

Ma, GH ^{[1
]}

He, J ^{[1
]}

Tang, SH ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Phys, Singapore 119260, Singapore

来源：

PHYSICS LETTERS A | 2003年 / 306卷 / 5-6期

关键词：

metal nanoparticles; optical Kerr effect; uhrafast nonlinear optical response;

D O I：

10.1016/S0375-9601(02)01626-2

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

TiO2 amorphous film doped with gold nanoparticles was fabricated by alternating rf-sputtering method under vacuum condition. The nonlinear optical response was investigated by the optically heterodyne optical Kerr effect (OHD-OKE) and pump-probe methods at a wavelength of 780 nm with a laser pulse of 130 fs. The values of real and imaginary part of chi((3)) were determined to be about 10(-8) esu with the wavelength close to the surface plasmon absorption peak. The time-resolved OKE and pump-probe results suggest that the main physical mechanism involved in the large nonlinear birefringence and dichroism of the Au:TiO2 composite films stems mainly from the hot electron contributions. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：348 / 352

页数：5

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