Abstract
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 language | English (US) |
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Pages (from-to) | 2064-2068 |
Number of pages | 5 |
Journal | Nano letters |
Volume | 10 |
Issue number | 6 |
DOIs | |
State | Published - Jun 9 2010 |
Externally published | Yes |
Keywords
- Nanoantenna
- Phase transition device
- Terahertz VO
- Terahertz active device
- Terahertz spectroscopy