Nonvolatile reconfigurable dynamic Janus metasurfaces in the terahertz regime

作     者：SHOUJUN ZHANG XIEYU CHEN KUAN LIU HAIYANG LI YUEHONG XU XIAOHAN JIANG YIHAN XU QINGWEI WANG TUN CAO ZHEN TIAN 

作者机构：Center for Terahertz Waves and College of Precision Instrument and Optoelectronics EngineeringKey Laboratory of Optoelectronic Information Technology(Ministry of Education of China)Tianjin UniversityTianjin 300072China School of Optoelectronic Engineering and Instrumentation ScienceDalian University of TechnologyDalian 116024China Georgia Tech Shenzhen Institute(GTSI)Tianjin UniversityShenzhen 518067China 

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

年 卷 期：2022年第10卷第7期

页      面：1731-1743页

核心收录：

学科分类：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] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：National Key Research and Development Program of China(2017YFA0701004,2019YFA0709100,2020YFA0714504) Tianjin Municipal Fund for Distinguished Young Scholars(20JCJQJC00190) Key Fund of Shenzhen Natural Science Foundation(JCYJ20200109150212515) 

主　　题：reconfigurable polarization switched 

摘      要：Metasurfaces,especially tunable ones,have played a major role in controlling the amplitude,phase,and polarization of electromagnetic waves and attracted growing interest,with a view toward a new generation of miniaturized ***,to date,most existing reconfigurable devices are bounded in volatile nature with sustained external energy to maintain and single functionality,which restrict their further ***,we demonstrate for the first time,to our knowledge,nonvolatile,reconfigurable,and dynamic Janus metasurfaces by incorporating phase-change material Ge_(2)Se_(2)Te_(5)(GST)in the terahertz(THz)***,we experimentally show the reversible switching characteristic of GST on large areas by applying a single nanosecond laser pulse,which exhibits excellent contrast of THz properties in both ***,we present a multiplex metasurface *** each metasurface,three sets of structures are adopted,in which two sets integrate *** effective structures can be reversely modulated by the amorphization and crystallization of *** a proof of concept,the dynamic beam splitter,bifocal metalens,dual-mode focusing optical vortex generators,and switchable metalens/focusing optical vortex generators are designed,fabricated,and experimentally characterized,and can be switched reversibly and repeatedly with the help of optical and thermal *** scheme will pave the way toward the development of multifunctional and compact THz devices and may find use for applications in THz imaging,sensing,and communications.