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Journal Article
Active Terahertz Nanoantennas Based on VO2 Phase Transition
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- Authors
- 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
- Issue Date
- 2010-06
- Citation
- Nano Letters, v.10, no.6, pp.2064-2068
- ISSN
- 1530-6984
- Publisher
- American Chemical Society(ACS)
- Language
- English
- Type
- Journal Article
- 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. © 2010 American Chemical Society.
- KSP Keywords
- Control range, Dynamic control, Memory effect, Metallic composite, Negative index of refraction, Phase transition, Sharp resonance, Terahertz frequency, Ultra-broadband, dielectric environments, extinction ratio