Torres-Torres D, Trejo-Valdez M, Castañeda L, Torres-Torres C, Tamayo-Rivera L, Fernández-Hernández R C, Reyes-Esqueda J A, Muñoz-Saldaña J, Rangel-Rojo R, Oliver A
Centro de Investigación y Estudios Avanzados del IPN Unidad Querétaro,76001 Querétaro, Qro, México.
Opt Express. 2010 Aug 2;18(16):16406-17. doi: 10.1364/OE.18.016406.
We use two different synthesis approaches for the preparation of TiO(2) films in order to study their resulting third order optical nonlinearity, and its modification by the inclusion of Au nanoparticles in one of the samples. An ultrasonic spray pyrolysis method was used for preparing a TiO(2) film in which we found two-photon absorption as a dominant nonlinear effect for 532 nm and 26 ps pulses; and a purely electronic nonlinearity at 830 nm for 80 fs pulses. A strong optical Kerr effect and the inhibition of the nonlinear optical absorption in 532 nm can be obtained for the first sample if Au nanoparticles embedded in a second TiO(2) film prepared by a sol-gel technique are added to it. We used an optical Kerr gate, z-scan, a multi-wave mixing experiment and an input-output transmittance experiment for measuring the optical nonlinearities.
为了研究TiO₂薄膜产生的三阶光学非线性以及通过在其中一个样品中加入金纳米颗粒对其进行改性，我们采用了两种不同的合成方法来制备TiO₂薄膜。采用超声喷雾热解法制备了TiO₂薄膜，我们发现对于532 nm和26 ps脉冲，双光子吸收是主要的非线性效应；对于80 fs脉冲，在830 nm处存在纯电子非线性。如果将通过溶胶-凝胶技术制备的第二个TiO₂薄膜中嵌入的金纳米颗粒添加到第一个样品中，则可以获得强烈的光学克尔效应并抑制532 nm处的非线性光学吸收。我们使用光学克尔门、z扫描、多波混频实验和输入-输出透过率实验来测量光学非线性。
