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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)29945-29955
Number of pages11
JournalRSC Advances
Volume10
Issue number50
DOIs
StatePublished - Aug 13 2020

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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