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Chin. Phys. B, 2009, Vol. 18(12): 5539    DOI: 10.1088/1674-1056/18/12/068
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Enhanced nonlinear optical absorption of Au/SiO2 nano-composite thin films

Zhang Bo-Pinga, Shang Peng-Penga, Zhao Cui-Huab
a School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; b School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;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.
Keywords:  plasma sputtering      optical absorption spectra      Au/SiO2 nano-composite film  
Received:  03 April 2009      Revised:  15 May 2009      Published:  20 December 2009
PACS:  78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters)  
  42.65.-k (Nonlinear optics)  
  68.55.A- (Nucleation and growth)  
  73.22.Lp (Collective excitations)  
  78.66.Sq (Composite materials)  
  81.15.Cd (Deposition by sputtering)  
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, Zhang Bo-Ping, Shang Peng-Peng Enhanced nonlinear optical absorption of Au/SiO2 nano-composite thin films 2009 Chin. Phys. B 18 5539

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