Enhanced Nonlinear Optical Properties of Laser Deposited Ag/BaTiO ₃ Nanocomposite Films

The composite films containing Ag particles embedded in BaTiO3 matrix were deposited on MgO (100) substrates by using the pulsed laser deposition technique and characterized by x-ray diffraction and x-ray photoelectron spectroscopy. The absorption peak resulting from the surface plasmon resonance of Ag particles is found at the wavelength of 430 nm. The third-order nonlinear optical characteristics of the films are determined by z-scan technique using a nanosecond laser. The results show that the Ag/BaTiO3 nanocomposite films exhibit great optical nonlinearities and the real and imaginary parts of the third-order nonlinear susceptibility χ(3) are calculated to be 4.544×10-6 esu and 2.352×10-7 esu, respectively. The enhancement mechanism of χ(3) is discussed.

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