Independent Control of Copolarized Amplitude and Phase Responses via Anisotropic Metasurfaces

被引：37
作者：
Wu, Rui Yuan [1 ]
Bao, Lei [1 ]
Wu, Liang Wei [1 ]
Wang, Zheng Xing [1 ]
Ma, Qian [1 ]
Wu, Jun Wei [1 ]
Bai, Guo Dong [1 ]
Galdi, Vincenzo [2 ]
Cui, Tie Jun [1 ]
机构：
[1] Southeast Univ, State Key Lab Millimeter Waves, Nanjing 210096, Peoples R China
[2] Univ Sannio, Dept Engn, Fields & Waves Lab, I-82100 Benevento, Italy
来源：
ADVANCED OPTICAL MATERIALS | 2020年 / 8卷 / 11期
基金：
中国国家自然科学基金;
关键词：
amplitude and phase control; anisotropic metasurfaces; arbitrary bifocal metalenses; equal-power vortex beams; polarization-reconfigurable; BAND; POLARIZATION; REFLECTION; SURFACES; METALENS; LENS;
D O I：
10.1002/adom.201902126
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A class of anisotropic, transmissive electromagnetic metasurfaces is presented, which enable independent and simultaneous control of copolarized phase and amplitude responses to two linear, orthogonal polarizations. By varying the geometrical parameters, the transmission response of the proposed structure can yield a full phase coverage, accompanied by broadly adjustable amplitude and negligible cross-polarized components. The full amplitude-phase control together with the novel anisotropic character allows efficient implementation of complicated field manipulations. As representative application examples, which cannot be realized via conventional (phase-only) metasurfaces, it is presented here: (1) the radiation of multiple equal-power vortex beams (along arbitrarily predesigned directions, with designable orbital angular momentum modes under different polarizations), and (2) the realization of polarization-reconfigurable multifocal metalenses. Full-wave numerical simulations and experimental results demonstrate good agreement and confirm the versatility and effectiveness of the proposed approach to design advanced field-manipulation systems.
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页数：10
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