Author Affiliations
Fudan University, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) and Department of Physics, State Key Laboratory of Surface Physics, Shanghai, China
Dynamically controlling terahertz (THz) waves with an ultracompact device is highly desired, but previously realized tunable devices are bulky in size and/or exhibit limited light-tuning functionalities. Here, we experimentally demonstrate dynamic modulation on THz waves with a dielectric metasurface in mode-selective or mode-unselective manners through pumping the system at different optical wavelengths. Quasi-normal-mode theory reveals that the physics is governed by the spatial overlap between wave functions of resonant modes and regions inside resonators perturbed by pump laser excitation at different wavelengths. We further design/fabricate a dielectric metasurface and experimentally demonstrate that it can dynamically control the polarization state of incident THz waves, dictated by the strength and wavelength of the pumping light. We finally numerically demonstrate pump wavelength-controlled optical information encryption based on a carefully designed dielectric metasurface. Our studies reveal that pump light wavelength can be a new external knob to dynamically control THz waves, which may inspire many tunable metadevices with diversified functionalities.
dynamic metasurfaces terahertz quasi-normal-mode theory optical pumping 
Advanced Photonics
2023, 5(2): 026005
汪国崔 1,2胡滨 2张岩 1,*
1 首都师范大学物理系,北京市超材料与器件重点实验室,太赫兹光电子学教育部重点实验室,北京市成像理论与技术创新中心,北京 100048
2 北京理工大学光电学院,混合现实与新型显示工程技术研究中心,北京 100081
材料 动态超构表面 编码 可重构 全息 实时成像 光通信 materials dynamic metasurfaces coding re-configuration hologram real-time imaging optical communication 
2021, 58(9): 0900001

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