title: A New Ba0.6 Sr0.4 TiO3 -Silicon Hybrid Metamaterial Device in Terahertz Regime.
abstract: 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 Ba0.6 Sr0.4 TiO3 -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 Ba0.6 Sr0.4 TiO3 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.
authors.affiliation: College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin, 300072, China.|School of Electrical and Computer Engineering Oklahoma State University, Stillwater, OK, 74078, USA.
authors.forename: Liang
authors.initials: L
authors.lastname: Wu
authors.affiliation: Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behavior of Materials, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Du
authors.affiliation: School of Electrical and Computer Engineering Oklahoma State University, Stillwater, OK, 74078, USA.
authors.forename: Ningning
authors.initials: N
authors.lastname: Xu
authors.affiliation: College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin, 300072, China.
authors.forename: Chunfeng
authors.initials: C
authors.lastname: Ding
authors.affiliation: College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin, 300072, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin, 300072, China.
authors.forename: Quan
authors.initials: Q
authors.lastname: Sheng
authors.affiliation: Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behavior of Materials, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Liu
authors.affiliation: College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin, 300072, China.
authors.forename: Jianquan
authors.initials: J
authors.lastname: Yao
authors.affiliation: School of Electrical and Computer Engineering Oklahoma State University, Stillwater, OK, 74078, USA.|Mechanics Department, School of Mechanical Engineering, Tianjin University, Tianjin, 300072, China.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behavior of Materials, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Lou
authors.affiliation: College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin, 300072, China.|School of Electrical and Computer Engineering Oklahoma State University, Stillwater, OK, 74078, USA.
authors.forename: Weili
authors.initials: W
authors.lastname: Zhang
keywords: BaSrTiO3 thin films; free carriers' absorption; metamaterials; terahertz