Large Nonlinear Optical Property of SrBi{sub}2Nb{sub}2O{sub}9 Thin Films Prepared by RF Magnetron Sputtering

摘要

Well-crystallized SrBi{sub}2Nb{sub}2O{sub}9 (SBN) thin films with good surface morphology were fabricated on quartz glass substrates by RF magnetron sputtering technique at a deposition temperature of 600°Cunder the O{sub}2/Ar(3:1) pressure of 2.4 Pa for 2 hour. The films exhibited bismuth-layered perovskite phase structure without pyrochlore phase and the ratio of Sr:Bi:Nb is about 1:1.92:1.98. The nonlinear optical properties of the films were determined by a single beam Z-scan technique at a wavelength of 532 nm with laser duration of 25 ps. The measured values of the real and imaginary parts of the third-order nonlinear optical susceptibility were 4.324×10{sup}(-8)esu and 1.278×10{sup}(-8)esu, respectively. The large nonlinear optical effect shows that the SrBi{sub}2Nb{sub}2O{sub}9 thin films have great potential application in designing nonlinear optical devices.