Enhanced femtosecond optical nonlinearity of Mn doped Ba0.6Sr0.4TiO3 films

We report the third-order optical nonlinearity of ferroelectric thin films of Mn doped Ba0.6Sr0.4TiO3 using Z-scan measurement with femtosecond laser pulses at 800 nm. The nonlinear refraction index and two-photon absorption coefficient are measured to be 3.0×10−4 cm2/GW and 1.7 cm/GW, respectively, which are about one order of magnitude larger than those of the undoped Ba0.6Sr0.4TiO3 thin films. The enhancement is attributed to the acceptor behavior of Mn ions dopant. The figure of merit, T, defined by T=βλ/n2, was calculated to be 0.44, less than 1. The results indicate that the thin films have great potential applications in nonlinear photonic devices.

[1]  K. V. Saravanan,et al.  Large three-photon absorption in Ba0.5Sr0.5TiO3 films studied using Z-scan technique , 2010 .

[2]  Yang Wang,et al.  Femtosecond third-order optical nonlinearity of BiFeO3. , 2009, Optics express.

[3]  H. Long,et al.  Femtosecond Z-scan measurement of third-order optical nonlinearities in anatase TiO2 thin films , 2009 .

[4]  Fei Qiu,et al.  Optical properties of amorphous Ba0.7Sr0.3TiO3 thin films obtained by metal organic decomposition technique , 2006, Photonics and Optoelectronics Meetings.

[5]  P. Suherman,et al.  Ba x Sr 1 − x TiO 3 Thin Films for Tunable Microwave Devices in Cryogenic and Room Temperature Application , 2008 .

[6]  W. Ji,et al.  Analytical expression for femtosecond-pulsed Z scans on instantaneous nonlinearity. , 2008, Applied optics.

[7]  Ho-Gi Kim,et al.  Annealing effect on dielectric and leakage current characteristics of Mn-doped Ba0.6Sr0.4TiO3 thin films as gate insulators for low voltage ZnO thin film transistor , 2008 .

[8]  Lingamallu Giribabu,et al.  Femtosecond and nanosecond nonlinear optical properties of alkyl phthalocyanines studied using Z-scan technique , 2007 .

[9]  Bruce W Wessels,et al.  Ferroelectric Epitaxial Thin Films for Integrated Optics , 2007 .

[10]  R. E. Araujo,et al.  Femtosecond nonlinear optical properties of lead-germanium oxide amorphous films , 2007 .

[11]  R. Morandotti,et al.  Microstructural and optical properties of Ba0.5Sr0.5TiO3 thin film deposited by pulsed laser deposition for low loss waveguide applications , 2007 .

[12]  J. Scott,et al.  Applications of Modern Ferroelectrics , 2007, Science.

[13]  Xiujian Zhu,et al.  Enhanced dielectric properties of Mn doped Ba0.6Sr0.4TiO3 thin films fabricated by pulsed laser deposition , 2006 .

[14]  Gregory J. Salamo,et al.  Nonlinear optical absorption and refraction of epitaxial Ba0.6Sr0.4TiO3 thin films on (001) MgO substrates , 2006 .

[15]  H. Tuller,et al.  Mn-doped Ba0.6Sr0.4TiO3 high-K gate dielectrics for low voltage organic transistor on polymer substrate , 2005 .

[16]  J. Han,et al.  Nonlinear optical properties in SrTiO3 thin films by pulsed laser deposition , 2005 .

[17]  K. Rabe,et al.  Physics of thin-film ferroelectric oxides , 2005, cond-mat/0503372.

[18]  Y. Han,et al.  Electrical Properties of Acceptor Doped BaTiO3 , 2004 .

[19]  A. Sigov,et al.  Domain orientation in ultrathin (Ba,Sr)TiO3 films measured by optical second harmonic generation , 2003 .

[20]  Hyoun‐Ee Kim,et al.  Electro-optic characteristics of (001)-oriented Ba0.6Sr0.4TiO3 thin films , 2003 .

[21]  J. Xue,et al.  Ultrafast optical nonlinearity in poly(methylmethacrylate)-TiO2 nanocomposites , 2003, cond-mat/0301153.

[22]  Y. Gim,et al.  High nonlinearity of Ba0.6Sr0.4TiO3 films heteroepitaxially grown on MgO substrates , 2000 .

[23]  Felix A. Miranda,et al.  Epitaxial ferroelectric Ba0.5Sr0.5TiO3 thin films for room-temperature tunable element applications , 1999 .

[24]  Xinhua Zhu,et al.  Origin of optical nonlinearity for PbO, TiO2, K2O, and SiO2 optical glasses , 1997 .

[25]  Lines..  Influence of d orbitals on the nonlinear optical response of transparent transition-metal oxides. , 1991, Physical review. B, Condensed matter.

[26]  G I Stegeman,et al.  Two-photon absorption as a limitation to all-optical switching. , 1989, Optics letters.

[27]  E. W. Stryland,et al.  High-sensitivity, single-beam n(2) measurements. , 1989, Optics letters.

[28]  S. H. Wemple,et al.  Oxygen‐Octahedra Ferroelectrics. I. Theory of Electro‐optical and Nonlinear optical Effects , 1969 .