A Theoretical Study on the Low Transition Temperature of VO 2 Metamaterials in the THz Regime

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 exte...

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Bibliographic Details
Published inCurrent optics and photonics Vol. 6; no. 6; pp. 583 - 589
Main Author Kyoung, Jisoo
Format Journal Article
LanguageKorean
Published 2022
Subjects
Slit array
Critical temperature
Terahertz
Insulator-to-metal phase transition
Thin film
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Summary: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.
Bibliography:KISTI1.1003/JNL.JAKO202236041236949
ISSN:2508-7266
2508-7274