Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10653508 | Solid State Communications | 2005 | 5 Pages |
Abstract
Well-crystallized 250 nm-thick SrTiO3 thin films on fused-quartz substrate were prepared by pulsed laser deposition. The band-gap of SrTiO3 thin film by transmittance spectra is equal to 3.50 eV, larger than 3.22 eV for the bulk crystal. The nonlinear optical properties of the films were examined with picosecond pulses at 1.064 μm excitation. A large two-photon absorption (TPA) with absorption coefficient of 87.7 cm/GW was obtained, larger than 51.7 cm/GW for BaTiO3 thin films. The nonlinear refractive index n2 is equal to 5.7Ã10â10 esu with a negative sign, larger than 0.267Ã10â11 esu for bulk SrTiO3. The large TPA is attributed to intermediate energy levels introduced by the grain boundaries, and the optical limiting behaviors stemming from both TPA and negative nonlinear refraction were also discussed.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Y. Deng, Y.L. Du, M.S. Zhang, J.H. Han, Z. Yin,