Journal
NANO LETTERS
Volume 10, Issue 6, Pages 2064-2068Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl1002153
Keywords
Terahertz spectroscopy; phase transition device; nanoantenna; terahertz active device; terahertz VO2
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Funding
- Korea Science and Engineering Foundation (KOSEF) [R11-2008-095-010000]
- Korea government (MEST) [2009-0071309]
- KICOS [K20815000003]
- Seoul Science Fellowship
- Seoul RBD Program [10543]
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Unusual performances of metamaterials such as negative index of refraction, memory effect, and cloaking originate from the resonance features of the metallic composite atom(1-6). Indeed, control of metamaterial properties by changing dielectric environments of thin films below the metallic resonators has been demonstrated(7-11). 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.
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