Terahertz spoof surface-plasmon-polariton subwavelength waveguide

作     者：YING ZHANG YUEHONG XU CHUNXIU TIAN QUAN XU XUEQIAN ZHANG YANFENG LI XIXIANG ZHANG JIAGUANG HAN WEILI ZHANG 

作者机构：Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Tianjin University and the Key Laboratory of Optoelectronics Information and Technology Tianjin Ministry of Education of China Tianjin 300072 China Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia School of Electrical and Computer Engineering Oklahoma State University Stillwater Oklahoma 74078 USA 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2018年第9卷第1期

页      面：18-23页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 0810[工学-信息与通信工程] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080402[工学-测试计量技术及仪器] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 081001[工学-通信与信息系统] 0702[理学-物理学] 

基　　金：Ministry of Science and Technology of the People’s Republic of China(MOST)(2014CB339800) National Natural Science Foundation of China(NSFC)(61420106006,61422509,61427814,61575141,61735012) National Science Foundation(NSF)(ECCS-1232081) 

主　　题：亚波长 通讯技术 传导速度 传播损耗 

摘      要：Surface plasmon polaritons(SPPs) with the features of subwavelength confinement and strong enhancements have sparked enormous interest. However, in the terahertz regime, due to the perfect conductivities of most metals, it is hard to realize the strong confinement of SPPs, even though the propagation loss could be sufficiently low. One main approach to circumvent this problem is to exploit spoof SPPs, which are expected to exhibit useful subwavelength confinement and relative low propagation loss at terahertz frequencies. Here we report the design,fabrication, and characterization of terahertz spoof SPP waveguides based on corrugated metal surfaces. The various waveguide components, including a straight waveguide, an S-bend waveguide, a Y-splitter, and a directional coupler, were experimentally demonstrated using scanning near-field terahertz microscopy. The proposed waveguide indeed enables propagation, bending, splitting, and coupling of terahertz SPPs and thus paves a new way for the development of flexible and compact plasmonic circuits operating at terahertz frequencies.