Chin. Phys. Lett.  2009, Vol. 26 Issue (9): 097804    DOI: 10.1088/0256-307X/26/9/097804
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Large Third-Order Optical Nonlinearity of Cadmium Sulphide Nanoparticles Embedded in Polymer Thin Films
WANG Cun-Xiu, FU Shi-Shu, Gu Yu-Zong
Institute of Microsystem Physics, Henan University, Kaifeng 475004
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WANG Cun-Xiu, FU Shi-Shu, Gu Yu-Zong 2009 Chin. Phys. Lett. 26 097804
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Abstract A simple method for synthesis of well dispersed cadmium sulphide nanoparticles embedded in a polyethylene glycol matrix (PEG 400) in thin film form is presented. The large blue shift of the band gap energy of the CdS nanoparticles compared to the bulk semiconductors is observed via UV-vis absorption spectra. Photoluminescence spectra of CdS nanocomposite films show that the emission peaks shift towards the longer wavelength with the increase of annealing temperature. Transmission electron microscopic images as well as Raman scattering studies confirm the CdS nanometer size particle formation within the polymer matrix. The particle size is about 8 nm. Selected area electron diffraction (SAED) shows the cubic zinc blende polycrystalline rings. Third-order optical nonlinearity of the CdS nanoparticles embedded in polymer thin films is studied with the Z-scan technique under 1064 nm excitation. The results show that the CdS nanocomposite film exhibits negative nonlinear refraction index and positive absorption coefficient. The film shows large optical nonlinearity, and the magnitude of the third-order nonlinear susceptibility of the film is calculated to be 1.73×10-9 esu. The corresponding mechanism is discussed.
Keywords: 78.66.-w      78.67.-n     
Received: 12 May 2009      Published: 28 August 2009
PACS:  78.66.-w (Optical properties of specific thin films)  
  78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/26/9/097804       OR      https://cpl.iphy.ac.cn/Y2009/V26/I9/097804
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WANG Cun-Xiu
FU Shi-Shu
Gu Yu-Zong
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