Enhanced nonlinear optical absorption of Au/SiO2 nano-composite thin films
Zhao Cui-Hua(赵翠华)a)b),Zhang Bo-Ping(张波萍) a)†, and Shang Peng-Peng(尚鹏鹏)a)
a School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; b College of Resources and Environment, Guangxi University, Nanning 530004, China
Abstract Nano metal-particle dispersed glasses are the attractive candidates for nonlinear optical material applications. Au/SiO2 nano-composite thin films with 3 vol% to 65 vol% Au are prepared by inductively coupled plasma sputtering. Au particles as perfect spheres with diameters between 10 nm and 30 nm are uniformly dispersed in the SiO2 matrix. Optical absorption peaks due to the surface plasmon resonance of Au particles are observed. The absorption property is enhanced with the increase of Au content, showing a maximum value in the films with 37 vol% Au. The absorption curves of the Au/SiO2 thin films with 3 vol% to 37 vol% Au accord well with the theoretical optical absorption spectra obtained from Mie resonance theory. Increasing Au content over 37 vol% results in the partial connection of Au particles, whereby the intensity of the absorption peak is weakened and ultimately replaced by the optical absorption of the bulk. The band gap decreases with Au content increasing from 3 vol% to 37 vol % but increases as Au content further increases.
Received: 03 April 2009
Revised: 15 May 2009
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 50842028 and
50972012) and the National Basic Research Program of China (Grant No
2007CB613301).
Cite this article:
Zhao Cui-Hua(赵翠华),Zhang Bo-Ping(张波萍), and Shang Peng-Peng(尚鹏鹏) Enhanced nonlinear optical absorption of Au/SiO2 nano-composite thin films 2009 Chin. Phys. B 18 5539
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