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首页> 外文期刊>Thin Solid Films >Composition dependence of structural and optical properties of Ba(Zr_x,Ti_(1-x))O_3 thin films grown on MgO substrates by pulsed laser deposition
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Composition dependence of structural and optical properties of Ba(Zr_x,Ti_(1-x))O_3 thin films grown on MgO substrates by pulsed laser deposition

机译：脉冲激光沉积在MgO衬底上生长的Ba（Zr_x，Ti_（1-x））O_3薄膜的结构和光学性质的成分依赖性

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摘要

Ba(Zr_x,Ti_(1-x))O_ (BZT) films with Zr concentration ranging from 0 to 40% were grown on MgO single crystal substrates by pulsed laser deposition, and their optical properties in the visible range were systematically characterized. A linear increase in the out-of-plane lattice constant of BZT unit cell with increasing Zr content was detected by X-ray diffraction. The surface morphology was observed by atomic force microscopy and the grain size was shown to increase with Zr concentration. Prism coupling and UV-visible transmission spectroscopy techniques were used to analyze the optical properties of the films. Refractive index between 2.15 and 2.3 was observed at 633 and 1547 nm respectively, which decreased with rising Zr content. The BZT films also possessed large optical band gap energy up to 3.92 eV, which increased with rising Zr content. Quadratic electro-optic effect was observed with electro-optic coefficients between 0.11 and 0.81 × 10 ~-18m~2/V~2, which decreased with Zr concentration. Optical loss was estimated from scattering and absorption, and the absorption coefficient dropped with increasing Zr content at near band gap. The obtained results provide information for the design of BZT thin film-based optical devices.
机译：通过脉冲激光沉积在MgO单晶衬底上生长Zr浓度在0％到40％之间的Ba（Zr_x，Ti_（1-x））O_（BZT）膜，并系统地表征了它们在可见光范围内的光学特性。通过X射线衍射检测到，随着Zr含量的增加，BZT晶胞的面外晶格常数线性增加。通过原子力显微镜观察表面形态，并且显示出晶粒尺寸随Zr浓度而增加。棱镜耦合和紫外-可见透射光谱技术用于分析薄膜的光学性能。折射率分别在633和1547 nm处在2.15和2.3之间，随着Zr含量的增加而降低。 BZT膜还具有高达3.92 eV的大光学带隙能量，随着Zr含量的增加而增加。观察到二次电光效应，电光系数在0.11和0.81×10〜-18m〜2 / V〜2之间，随Zr浓度的增加而降低。通过散射和吸收来估计光损失，并且在近带隙处吸收系数随着Zr含量的增加而下降。获得的结果为基于BZT薄膜的光学器件的设计提供了信息。

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  • 来源
    《Thin Solid Films》 |2011年第19期|p.6313-6318|共6页
  • 作者

    J.Z. Xin; C.W. Leung; H.L.W. Chan;

  • 作者单位

    Department of Applied Physics and Materials Research Centre, the Hong Kong Polytechnic University, Hung Horn, Kowloon, Hong Kong, PR China;

    Department of Applied Physics and Materials Research Centre, the Hong Kong Polytechnic University, Hung Horn, Kowloon, Hong Kong, PR China;

    Department of Applied Physics and Materials Research Centre, the Hong Kong Polytechnic University, Hung Horn, Kowloon, Hong Kong, PR China;

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  • 正文语种 eng
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  • 关键词

    barium zirconate titanate; thin films; composition; optical properties;

    机译：钛酸锆钛酸钡;薄膜;组成;光学性质;

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