Active terahertz nanoantennas based on VO2 phase transition

Minah Seo, Jisoo Kyoung, Hyeongryeol Park, Sukmo Koo, Hyun Sun Kim, Hannes Bernien, Bong Jun Kim, Jong Ho Choe, Yeong Hwan Ahn, Hyun Tak Kim, Namkyoo Park, Q. Han Park, Kwangjun Ahn, Dai Sik Kim

Research output: Contribution to journalArticlepeer-review

347 Citations (Scopus)


Unusual performances of metamaterials such as negative index of refraction, memory effect, and cloaking originate from the resonance features of the metallic composite atom1-6. Indeed, control of metamaterial properties by changing dielectric environments of thin films below the metallic resonators has been demonstrated7-11. However, the dynamic control ranges are still limited to less than a factor of 10,7-11 with the applicable bandwidth defined by the sharp resonance features. Here, we present ultra-broad-band metamaterial thin film with colossal dynamic control range, fulfilling present day research demands. Hybridized with thin VO2 (vanadium dioxide)12-18 films, nanoresonator supercell arrays designed for one decade of spectral width in terahertz frequency region show an unprecedented extinction ratio of over 10000 when the underlying thin film experiences a phase transition. Our nanoresonator approach realizes the full potential of the thin film technology for long wavelength applications.

Original languageEnglish
Pages (from-to)2064-2068
Number of pages5
JournalNano Letters
Issue number6
Publication statusPublished - 2010 Jun 9


  • Nanoantenna
  • Phase transition device
  • Terahertz VO
  • Terahertz active device
  • Terahertz spectroscopy

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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