Large third-order nonlinear optical susceptibility of Au-Al2O3 composite films near the resonant frequency

被引：81

作者：

Liao, HB ^{[1
]}

Xiao, RF ^{[1
]}

Fu, JS ^{[1
]}

Wong, GKL ^{[1
]}

机构：

[1] HONG KONG UNIV SCI & TECHNOL, DEPT PHYS, KOWLOON, HONG KONG

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 1997年 / 65卷 / 4-5期

关键词：

D O I：

10.1007/s003400050331

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Au:Al2O3 composite films with high Au concentrations (30%-60% in volume fraction) were prepared by reactive co-sputtering and post rapidly thermal annealing. The structure of the films and the size distributions of the Au nanoclusters were examined by TEM, and the third-order nonlinear optical susceptibility chi((3)) was measured by degenerated four-wave mixing using a 70-ps pulse laser at 532 nm. The maximum value of the chi((3)) was about 1.2 x 10(-6) esu in the annealed films and occurred at around 45% Au concentration. The figure of merit, chi((3))/alpha (alpha is the absorption coefficient), has a value of 7 x 10(-12) esu cm over a wide range of Au concentrations.

引用

页码：673 / 676

页数：4

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