期刊
OPTICS EXPRESS
卷 30, 期 25, 页码 45488-45498出版社
Optica Publishing Group
DOI: 10.1364/OE.475735
关键词
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类别
资金
- National Natural Science Foundation of China
- Fundamental Research Funds for the Central Universities
- Jiangsu Provincial Key Laboratory of Advanced Manipulating Technique of Electromagnetic Wave
- [62004093,62035014]
- [62227820]
PB metasurfaces show superior performance in the THz region with an ultra-thin structure, achieving broadband and efficient wavefront manipulation. By spatially rotating orientation, beam steering and superposition of vortex waves can be achieved.
Pancharatnam-Berry (PB) metasurfaces have demonstrated mighty capability to manipulate electromagnetic (EM) waves, and exhibited potential applications for devices with broadband and efficient functionality. However, it remains a challenge to simultaneously achieve broadband and efficient wavefront manipulation for terahertz (THz) components with simple profiles. Herein, we introduce a simple ultra-thin PB metasurface with superior properties in the THz region. The structure is composed of a simple metallic C-Shaped Split Ring Resonator (CSRR) patterned on a flexible polyimide support layer. It is verified that the circular transmission efficiency is close to the theoretical limit of the single-layer metasurface in the range of 0.6 -1.2 THz. Furthermore, we design metasurfaces based on the PB meta-atoms with spatially rotated orientation to achieve beam steering and superposition of vortex waves. The results are basically in line with expectations, validating the good performances of our proposal. This simple and easily deployable metasurface will give rise to more possibilities for the design of THz functional devices. (c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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