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Unveiling the optical parameters of vanadium dioxide in the phase transition region: a hybrid modeling approach

机译：揭示相变区域中二氧化钒的光学参数：混合建模方法

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摘要

The phase change behavior of vanadium dioxide (VO2) has been widely explored in a variety of optical and photonic applications. Commonly, its optical parameters have been studied in two extreme regimes: hot (metallic) and cold (insulating) states. However, in the transition temperatures, VO(2)acts like an inherent metamaterial with mixed metallic-insulating character. In this range, the portions of metallic and insulating inclusions are tuned by temperature, and therefore a gradual change of optical parameters can be achieved. In this paper, a universal hybrid modeling approach is developed to model VO(2)in the intermediate region. For this aim, the measured reflectivity data, is analyzed and matched through the transfer matrix method (TMM) simulations where an effective medium theory (EMT) is employed. Based on the findings of this approach, not only the relative portions of inclusions are tailored but also their grain shapes are significantly altered in the transition range. Finally, the modeling approach is testified by experimental findings through dynamic device applications operating at short and mid infrared wavelengths. In addition, the hysteretic behaviors on electrical, optical, and structural parameters of the VO(2)film along the heating and cooling cycles are demonstrated by the experiments and scrutinized by the simulations.
机译：二氧化钒（VO2）的相变行为已广泛探索各种光学和光子应用。通常，其光学参数已经在两个极端制度中进行了研究：热（金属）和冷（绝缘）状态。然而，在过渡温度下，VO（2）就像具有混合金属绝缘特征的固有的超材料。在该范围内，金属和绝缘夹杂物的部分通过温度调谐，因此可以实现光学参数的逐渐变化。在本文中，开发了一种通用的混合建模方法以在中间区域的模拟VO（2）中。为此目的，通过使用有效介质理论（EMT）的传递矩阵法（TMM）模拟来分析测量的反射率数据。基于这种方法的发现，不仅夹杂物的相对部分被定制，而且它们的晶粒形状在转变范围内显着改变。最后，通过在短和中红外波长下操作的动态设备应用，通过实验方法来证实建模方法。另外，通过实验证明了VO（2）膜的电气，光学和结构参数上的滞后行为，并通过模拟仔细仔细审查。

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  • 来源
    《RSC Advances》 |2020年第50期|共11页
  • 作者

    Cakir Mehmet Cihan; Kocer Hasan; Durna Yilmaz; Yildirim Deniz Umut; Ghobadi Amir; Hajian Hodjat; Aydin Koray; Kurt Hamza; Saglam Necdet; Ozbay Ekmel;

  • 作者单位

    Bilkent Univ NANOTAM Nanotechnol Res Ctr TR-06800 Ankara Turkey;

    Bilkent Univ NANOTAM Nanotechnol Res Ctr TR-06800 Ankara Turkey;

    TOBB Univ Econ &

    Technol Nanophoton Res Lab TR-06560 Ankara Turkey;

    Bilkent Univ NANOTAM Nanotechnol Res Ctr TR-06800 Ankara Turkey;

    Bilkent Univ NANOTAM Nanotechnol Res Ctr TR-06800 Ankara Turkey;

    Bilkent Univ NANOTAM Nanotechnol Res Ctr TR-06800 Ankara Turkey;

    Northwestern Univ Dept Elect Engn &

    Comp Sci Evanston IL 60208 USA;

    TOBB Univ Econ &

    Technol Dept Elect &

    Elect Engn TR-06560 Ankara Turkey;

    Hacettepe Univ Dept Nanotechnol &

    Nanomed TR-06800 Ankara Turkey;

    Bilkent Univ NANOTAM Nanotechnol Res Ctr TR-06800 Ankara Turkey;

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  • 正文语种 eng
  • 中图分类 化学;
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