Current Optics and Photonics

Optical Society of Korea (한국광학회)
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A Theoretical Study on the Low Transition Temperature of VO2 Metamaterials in the THz Regime

  • Received : 2022.07.11
  • Accepted : 2022.11.02
  • Published : 2022.12.25
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Abstract

Vanadium dioxide (VO2) is a well-known material that undergoes insulator-to-metal phase transition near room temperature. Since the conductivity of VO2 changes several orders of magnitude in the terahertz (THz) spectral range during the phase transition, VO2-based active metamaterials have been extensively studied. Experimentally, it is reported that the metal nanostructures on the VO2 thin film lowers the critical temperature significantly compared to the bare film. Here, we theoretically studied such early transition phenomena by developing an analytical model. Unlike experimental work that only measures transmission, we calculate the reflection and absorption and demonstrate that the role of absorption is quite different for bare and patterned samples; the absorption gradually increases for bare film during the phase transition, while an absorption peak is observed at the critical temperature for the metamaterials. In addition, we also discuss the gap width and VO2 thickness effects on the transition temperatures.

Keywords

Acknowledgement

The present research was supported by the research fund of Dankook University in 2020.

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