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Active Terahertz Nanoantennas Based on VO(2) Phase Transition RID E-5694-2010

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


Journal:
NANO LETTERS


Issue Date:
2010


Abstract(summary):

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 VO(2) (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.


Page:
2064---2068


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