Active terahertz metamaterials: Nano-slot antennas on VO2 thin films

J. S. Kyoung, M. A. Seo, S. M. Koo, H. R. Park, H. S. Kim, B. J. Kim, H. T. Kim, N. K. Park, D. S. Kim, K. J. Ahn

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We demonstrate a broadband metamaterial based on nano-slot antenna on a VO2 thin film, which transforms itself from transparent to completely extinct over a broad spectrum when the underlying VO2 thin film makes Mott-insulator-to-metal phase transition. Our structure, long wavelength nano resonators inspired by log-periodic antenna, has 2 terahertz (THz) wide spectral range with 10,000: 1 extinction ratio through thermal and photo excitation. Two of the most important demands for present metamaterials research, broadband operation and full transmission/extinction control, are met in our metamaterial. Our structure enables nano-scale thin film technology to fully enter into long wavelength applications, and we foresee a wide range of applications in areas where perfect modulation, giant nonlinearity, switching, and filtering in broad THz bands are desired.

Original languageEnglish (US)
Pages (from-to)1227-1230
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Issue number4
StatePublished - Apr 2011
Externally publishedYes


  • Metamaterial
  • Slot antennas
  • Sub-wavelength optics
  • Terahertz
  • Vanadium dioxide


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