title: Plasmonic metalens based on coupled resonators for focusing of surface plasmons.
abstract: As an essential functionality, flexible focusing of surface plasmons (SPs) is of particular interest in nonlinear optics and highly integrated plasmonic circuitry. Here, we developed a versatile plasmonic metalens, a metasurface comprised of coupled subwavelength resonators, whose optical responses exhibit a remarkable feature of electromagnetically induced transparency (EIT). We demonstrate numerically and experimentally how a proper spatial design of the unit elements steers SPs to arbitrary foci based on the holographic principles. More specifically, we show how to control the interaction between the constituent EIT resonators to efficiently manipulate the focusing intensity of SPs. We also demonstrated that the proposed metalens is capable of achieving frequency division multiplexing. The power and simplicity of the proposed design would offer promising opportunities for practical plasmonic devices.
authors.affiliation: Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China.|Cooperative Innovation Center of Terahertz Science, Chengdu 610054, China.
authors.forename: Quan
authors.initials: Q
authors.lastname: Xu
authors.affiliation: Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China.|Cooperative Innovation Center of Terahertz Science, Chengdu 610054, China.
authors.forename: Xueqian
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China.|Cooperative Innovation Center of Terahertz Science, Chengdu 610054, China.
authors.forename: Yuehong
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China.|Cooperative Innovation Center of Terahertz Science, Chengdu 610054, China.
authors.forename: Quan
authors.initials: Q
authors.lastname: Li
authors.affiliation: Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China.|Cooperative Innovation Center of Terahertz Science, Chengdu 610054, China.
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Li
authors.affiliation: Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China.|Cooperative Innovation Center of Terahertz Science, Chengdu 610054, China.
authors.forename: Chunmei
authors.initials: C
authors.lastname: Ouyang
authors.affiliation: Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China.|Cooperative Innovation Center of Terahertz Science, Chengdu 610054, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Tian
authors.affiliation: Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China.|Cooperative Innovation Center of Terahertz Science, Chengdu 610054, China.
authors.forename: Jianqiang
authors.initials: J
authors.lastname: Gu
authors.affiliation: College of Electrical Engineering and Automation, Guilin University of Electronic Technology, Guilin 541000, China.
authors.forename: Wentao
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Divison of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
authors.forename: Xixiang
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China.|Cooperative Innovation Center of Terahertz Science, Chengdu 610054, China.
authors.forename: Jiaguang
authors.initials: J
authors.lastname: Han
authors.affiliation: Center for Terahertz waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China.|Cooperative Innovation Center of Terahertz Science, Chengdu 610054, China.|School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
authors.forename: Weili
authors.initials: W
authors.lastname: Zhang