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

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      Author(s)
      Çakır, Mehmet Cihan
      Koçer, Hasan
      Durna, Y.
      Yıldırım, Deniz Umut
      Ghobadi, Amir
      Hajian, Hodjat
      Aydın, K.
      Kurt, H.
      Sağlam, N.
      Özbay, Ekmel
      Date
      2020
      Source Title
      RSC Advances
      Print ISSN
      2046-2069
      Publisher
      Royal Society of Chemistry
      Volume
      10
      Issue
      50
      Pages
      29945 - 29955
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      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, VO2 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 VO2 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 VO2 film along the heating and cooling cycles are demonstrated by the experiments and scrutinized by the simulations.
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      http://hdl.handle.net/11693/75730
      Published Version (Please cite this version)
      https://dx.doi.org/10.1039/d0ra05890d
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      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Nanotechnology Research Center (NANOTAM) 1179
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