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首页> 外文期刊>Applied Surface Science >Preparation and the optical nonlinearity of surface chemistry improved titania nanoparticles in poly(methyl methacrylate)-titania hybrid thin films
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Preparation and the optical nonlinearity of surface chemistry improved titania nanoparticles in poly(methyl methacrylate)-titania hybrid thin films

机译：聚甲基丙烯酸甲酯-二氧化钛杂化薄膜中表面化学改良的二氧化钛纳米粒子的制备及光学非线性

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摘要

With 800-nm, 120-fs laser pulses, optical nonlinearity has been studied in a series of thin films containing poly(methyl methacrylate) (PMMA), filled with surfactant acetylacetone (Acac) capped TiO_2 nanoparticles, which were synthesized by a simple in situ sol-gel/polymerization process, assisted by spin coating and multi-step baking. The resulting nanohybrid thin films have highly optical transparency and demonstrate a unique nonlinear optical (NLO) response. The highest nonlinear refractive index (n_2) is observed up to 6.55 × 10~(-2) cm~2 GW~(-1) in the nanohybrid thin film of 60 wt% Ti(OBu)_4 in PMMA, with a negligible two-photon absorption (TPA), as confirmed by the Z-scan technique. The titanium precursor loading combined with the nature of the capping molecules are used to influence the ability of nanoparticles to nonlinear optical response. Indeed, the ligands at the nanoparticles' surface can not only control the extent of the interaction between the organic molecules and the embedded nanoparticles but also influence the optical nonlinearities of nanoparticles.
机译：用800 nm，120 fs的激光脉冲，已研究了一系列含有聚甲基丙烯酸甲酯（PMMA）的薄膜的光学非线性，该薄膜填充有表面活性剂乙酰丙酮（Acac）封盖的TiO_2纳米颗粒，该纳米颗粒通过简单的方法合成。原位溶胶-凝胶/聚合工艺，辅以旋涂和多步烘烤。所得的纳米杂化薄膜具有高度的光学透明性，并表现出独特的非线性光学（NLO）响应。在PMMA中60 wt％Ti（OBu）_4的纳米复合薄膜中，观察到最高非线性折射率（n_2）高达6.55×10〜（-2）cm〜2 GW〜（-1），其中两个可以忽略不计-光子吸收（TPA），如Z扫描技术所证实。钛前体的负载与封盖分子的性质相结合，可用来影响纳米粒子对非线性光学响应的​​能力。实际上，纳米颗粒表面的配体不仅可以控制有机分子与嵌入的纳米颗粒之间相互作用的程度，而且可以影响纳米颗粒的光学非线性。

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  • 来源
    《Applied Surface Science》 |2010年第8期|2620-2625|共6页
  • 作者

    Xiujing Sun; Xiangjun Chen; Guanghua Fan; Shiliang Qu;

  • 作者单位

    Department of Physics, Harbin Institute of Technology, Harbin 150001, China Department of Optoelectronics Science, Harbin Institute of Technology at Weihai, Weihai 264209, China;

    Department of Physics, Harbin Institute of Technology, Harbin 150001, China Department of Optoelectronics Science, Harbin Institute of Technology at Weihai, Weihai 264209, China;

    Department of Optoelectronics Science, Harbin Institute of Technology at Weihai, Weihai 264209, China;

    Department of Optoelectronics Science, Harbin Institute of Technology at Weihai, Weihai 264209, China;

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  • 正文语种 eng
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  • 关键词

    nanohybrid thin film; surface improvement; optical nonlinearity;

    机译：纳米杂化薄膜表面改善;光学非线性;

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