상세정보
학술지
Active Terahertz Nanoantennas Based on VO2 Phase Transition
- 발행일
- 201006
- 출처
- Nano Letters, v.10 no.6, pp.2064-2068
- ISSN
- 1530-6984
- 출판사
- American Chemical Society(ACS)
- 협약과제
- 10MB2700, 전기적 점프(Current Jump)를 이용한 신소자 기술, 김현탁
- 초록
- 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 제안 키워드
- Control range, Dynamic control, Memory effect, Metallic composite, Negative index of refraction, Phase transition, Sharp resonance, Terahertz frequency, Ultra-broadband, dielectric environments, extinction ratio