Nonlinear optical properties in SrTiO3 thin films by pulsed laser deposition

被引：42

作者：

Deng, Y

Du, YL

Zhang, MS ^{[1
]}

Han, JH

Yin, Z

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

[2] Nanjing Univ, Ctr Mat Anal, Nanjing 210093, Peoples R China

[3] Nanjing Univ Sci & Technol, Dept Mat Sci & Engn, Nanjing 21000, Peoples R China

[4] Henan Univ, Dept Phys, Kaifeng 475001, Peoples R China

来源：

SOLID STATE COMMUNICATIONS | 2005年 / 135卷 / 04期

基金：

中国国家自然科学基金;

关键词：

perovskite thin film; laser processing; nonlinear optical properties;

D O I：

10.1016/j.ssc.2005.04.031

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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 pm 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 n(2) is equal to 5.7 x 10(-10) esu with a negative sign, larger than 0.267 x 10(-11) 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. (c) 2005 Published by Elsevier Ltd.

引用

页码：221 / 225

页数：5

共 28 条

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