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Linear and nonlinear optical properties of SrBi2Nb2O9 thin films fabricated by RF magnetron sputtering

KANSONG CHEN1,* , HAOSHUANG GU1, LI XU1

Affiliation

  1. School of Physics and Electronic Technology, Key Laboratory of Ferroelectric and Piezoelectric Materials and Devices of Hubei Province, Hubei University, Wuhan 430062, China

Abstract

SrBi2Nb2O9 (SBN) thin films were prepared on fused quartz substrates at room temperature by RF magnetron sputtering technique. The structure and the composition of the films were characterized by X-ray diffraction and X-ray fluorescence spectrometry. The optical transmittance of the samples was measured and their dispersion of refractive index was found to follow the Sellmeier-type dispersion relation. The nonlinear optical properties of the films were determined using a single beam z-scan technique at a laser wavelength of 532 nm with duration of 25 ps. The real and imaginary parts of the third-order nonlinear optical susceptibility χ(3) were -6.10×10-8 esu and 1.94×10-8 esu, respectively, suggesting a self-defocusing optical nonlinearity. The results show that SBN thin films have great potential applications in nonlinear optics.

Keywords

SrBi2Nb2O9 thin films, RF magnetron sputtering, Optical transmittance, Nonlinear optical properties, Z-scan technique.

Citation

KANSONG CHEN, HAOSHUANG GU, LI XU, Linear and nonlinear optical properties of SrBi2Nb2O9 thin films fabricated by RF magnetron sputtering, Optoelectronics and Advanced Materials - Rapid Communications, 1, 9, September 2007, pp.425-429 (2007).

Submitted at: July 31, 2007

Accepted at: Aug. 15, 2007