A New Ba0.6Sr0.4TiO3-Silicon Hybrid Metamaterial Device in Terahertz Regime

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• 作者：Liang Wu ; Ting Du ; Ningning Xu ; Chunfeng Ding ; Hui Li ; Quan Sheng ; Ming Liu ; Jianquan Yao ; Zhiyong Wang ; Xiaojie Lou and Weili Zhang
• 刊名：Small
• 出版年：2016
• 出版时间：May 18, 2016
• 年：2016
• 卷：12
• 期：19
• 页码：2610-2615
• 全文大小：1468K
• ISSN：1613-6829

文摘

Metamaterials, offering unprecedented functionalities to manipulate electromagnetic waves, have become a research hotspot in recent years. Through the incorporation of active media, the exotic electromagnetic behavior of metamaterials can be dramatically empowered by dynamic control. Many ferroelectric materials such as BaSrTiO₃ (abbreviated as BST), exhibiting strong response to external electric field, hold great promise in both microwave and terahertz tunable devices. A new active Ba_0.6Sr_0.4TiO₃–silicon hybrid metamaterial device, namely, a SRR (square split-ring resonator)–BaSrTiO₃ thin film-silicon three-layer structure is fabricated and intensively studied. The active Ba_0.6Sr_0.4TiO₃ thin film hybrid metamaterial, with nanoscale thickness, delivers a transmission contrast up to ≈79% due to electrically enabled carrier transport between the ferroelectric thin film and silicon substrate. This work has significantly increased the low modulation rate of ferroelectric based devices in terahertz range, a major problem in this field remaining unresolved for many years. The proposed BST metamaterial is promising in developing high-performance real world photonic devices for terahertz technology.