title: Broadband unidirectional behavior of electromagnetic waves based on transformation optics.
abstract: High directive antennas are fundamental elements for microwave communication and information processing. Here, inspired by the method of transformation optics, we propose and demonstrate a transformation medium to control the transmission path of a point source, resulting in the unidirectional behavior of electromagnetic waves (directional emitter) without any reflectors. The network of inductor-capacitor transmission lines is designed to experimentally realize the transformation medium. Furthermore, the designed device can work in a broadband frequency range. The unidirectional-manner-based device demonstrated in this work will be an important step forward in developing a new type of directive antennas.
authors.affiliation: Shanghai Key Lab of Modern Optical System and Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, P.R. China.|Terahertz Science Cooperative Innovation Center, Chengdu 610054, P.R. China.
authors.forename: XiaoFei
authors.initials: X
authors.lastname: Zang
authors.affiliation: Shanghai Key Lab of Modern Optical System and Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, P.R. China.|Terahertz Science Cooperative Innovation Center, Chengdu 610054, P.R. China.
authors.forename: YiMing
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Shanghai Key Lab of Modern Optical System and Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, P.R. China.
authors.forename: XueBin
authors.initials: X
authors.lastname: Ji
authors.affiliation: Shanghai Key Lab of Modern Optical System and Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, P.R. China.|Terahertz Science Cooperative Innovation Center, Chengdu 610054, P.R. China.
authors.forename: Lin
authors.initials: L
authors.lastname: Chen
authors.affiliation: Shanghai Key Lab of Modern Optical System and Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, P.R. China.|Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
authors.forename: Qing
authors.initials: Q
authors.lastname: Hu
authors.affiliation: Shanghai Key Lab of Modern Optical System and Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, P.R. China.|Terahertz Science Cooperative Innovation Center, Chengdu 610054, P.R. China.
authors.forename: SongLin
authors.initials: S
authors.lastname: Zhuang