Chin. Phys. Lett.  2010, Vol. 27 Issue (2): 024204    DOI: 10.1088/0256-307X/27/2/024204
FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
Photoinduced Reorientation Process and Nonlinear Optical Properties of Ag Nanoparticle Doped Azo Polymer Films
DENG Yan1, SHEN Jing2
1Department of Mathematics and Physics, Anhui University of Architecture, Hefei 2306012Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026
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DENG Yan, SHEN Jing 2010 Chin. Phys. Lett. 27 024204
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Abstract Azobenzene polymer films doped with and without Ag nanoparticles are prepared. The photoinduced reorientation process is investigated by using an Nd:YVO4 pump beam at 532 nm and a low semiconductor laser beam at 650 nm. The reorientation rate of azo polymer films is enhanced in the presence of Ag nanoparticles, and the rate of the azo polymer film with Ag concentration of 2.2 μg/ml is larger than that of the azo polymer films with Ag concentrations of 1.1 μg/ml and 4.4 μg/ml. The third-order nonlinear optical properties of the Ag/azo composite film are obtained by the Z-scan technique at a wavelength of 532 nm, and the measured nonlinear refractive index is 9.258×10-9 esu. It is shown that the main mechanisms involved in the large nonlinear optical responses come from the local field enhancement of Ag nanoparticles and the nonlinear effect of the azo polymer matrix.
Keywords: 42.65.-k      78.67.-n      82.35.Np     
Received: 09 October 2009      Published: 08 February 2010
PACS:  42.65.-k (Nonlinear optics)  
  78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)  
  82.35.Np (Nanoparticles in polymers)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/27/2/024204       OR      https://cpl.iphy.ac.cn/Y2010/V27/I2/024204
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DENG Yan
SHEN Jing
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