메타물질 및 VO2 박막 기반의 전기적 제어 가능한 테라헤르츠파 변조기
Electrically Controllable Terahertz Wave Modulator Based on a Metamaterial and VO2 Thin Film
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초록
본 논문에서는 온도 변화에 따라 절연체-금속 상전이 특성을 보이는 이산화바나듐(VO2)과 메타물질을 이용하여 전기적으로제어 가능한 테라헤르츠 변조기를 제시하였다. 변조기 기능을 하는 메타물질 구조가 VO2의 도전율 변화에 영향을 주는 열을전기적으로 조절할 수 있는 히터의 역할도 동시에 할 수 있는 정사각고리 구조의 메타물질을 설계하였다. 설계한 VO2기반 메타물질 변조기의 전파 투과량은 정사각고리 메타물질에 직접 연결된 전압 인가용 도선을 통한 인가 전압 변화로 조절이 가능하다. VO2의 도전율 변화에 따라 전파 투과계수는 470 GHz 에서 0.27에서 0.80으로 안정적으로 조절되었고, 13% 주파수 대역폭에서투과계수 변화폭이 일정하게 유지되었다.
Abstract
We propose an electrically controllable terahertz wave modulator based on a metamaterial and vanadium dioxide (VO2) thinfilm. A square loop shape is designed to play the roles of both a resonating metamaterial and a heater to electrically controlthe conductivity of VO2. The transmission characteristics of the modulator were controlled by voltage. The transmission coefficientof the modulator was stably changed from 0.27 to 0.80 at 470 GHz according to the conductivity values of VO2.
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