상세정보
학술지
Electrically Controllable Terahertz Square-loop Metamaterial based on VO2 Thin Film
- 발행일
- 201605
- 출처
- Nanotechnology, v.27 no.19, pp.1-8
- ISSN
- 0957-4484
- 출판사
- Institute of Physics (IOP)
- 협약과제
- 16ZR1600, 튜너블 테라헤르츠 트랜시버 기술 개발, 박경현
- 초록
- An electrically controllable square-loop metamaterial based on vanadium dioxide (VO2) thin film was proposed in the terahertz frequency regime. The square-loop shaped metamaterial was adopted to perform roles not only as a resonator but also as a micro-heater for the electrical control of the VO2. A dual-resonant square-loop structure was designed to realize band-pass characteristics in the desired frequency band. The measured Q-factors of the basic and scaled-down metamaterials fabricated on VO2 thin films were 2.22 and 1.61 at the center frequencies of 0.44 and 1.14 THz in the passbands, respectively. The transmittances of the proposed metamaterial were successfully controlled by applying a bias voltage without an external heater. The measured transmittance on-off ratios of the metamaterials were over 40 at the center frequencies in the passbands. In the future, electrically controllable terahertz metamaterial based on VO2 metamaterial could be employed as high-performance active filters or sensors.
- KSP 제안 키워드
- Active filters, Center frequency, Electrical control, External heater, High performance, Micro-heater, On-off, Quality-factor(Q-factor), Terahertz metamaterial, band pass, bias voltage