(Peer-Reviewed) Highly efficient vectorial field manipulation using a transmitted tri-layer metasurface in the terahertz band
Huan Zhao 赵欢 ¹ ², Xinke Wang 王新柯 ², Shutian Liu 刘树田 ¹, Yan Zhang 张岩 ²
¹ Department of Physics, Harbin Institute of Technology, Harbin 150001, China
中国 哈尔滨 哈尔滨工业大学物理系
² Beijing Key Laboratory of Metamaterials and Devices, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing Advanced Innovation Center for Imaging Theory and Technology, Department of Physics, Capital Normal University, Beijing 100048, China
中国 北京 首都师范大学物理系 北京成像理论与技术高精尖创新中心 超材料与器件北京市重点实验室 太赫兹光电子学省部共建教育部重点实验室
Opto-Electronic Advances, 2023-02-25
Polarization is a basic characteristic of electromagnetic waves that conveys much optical information owing to its many states. The polarization state is manipulated and controlled for optical information security, optical encryption, and optical communication. Metasurface devices provide a new way to manipulate wave-fronts of light.
A single ultrathin metasurface device can generate and modulate several differently polarized light fields, and thus carries optical information in several different channels. Terahertz (THz) waves have become widely used as carrier waves for wireless communication. Compact and functional metasurface devices are in high demand for THz elements and systems.
This paper proposes a tri-layer metallic THz metasurface for multi-channel polarization generation and phase modulation with a high efficiency of approximately 80%. An azimuthally polarized THz vectorial beam generator is realized and characterized for use as a THz polarization analyzer. The incident polarization angle can be observed graphically with high accuracy.
Moreover, a vectorial hologram with eight channels for different linear polarization states is demonstrated experimentally. The information in different holograms can be hidden by choosing the polarization channel for detection. This work contributes to achieving multi-functional metasurface in the THz band and can benefit THz communication and optical information security.
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