Nano Archive

Enhanced nonlinear optical absorption of Au/SiO 2 nano-composite thin films

Cui-Hua, Zhao and Bo-Ping, Zhang and Peng-Peng, Shang (2009) Enhanced nonlinear optical absorption of Au/SiO 2 nano-composite thin films. Chinese Physics B, 18 (12). p. 5539.

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Official URL: http://stacks.iop.org/1674-1056/18/i=12/a=068

Abstract

Nano metal-particle dispersed glasses are the attractive candidates for nonlinear optical material applications. Au/SiO 2 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 SiO 2 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/SiO 2 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.

Item Type:Article
ID Code:11291
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:31
Last Modified:02 Nov 2011 00:47

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