Bifunctional Manipulation of Terahertz Waves with High-Efficiency Transmissive Dielectric Metasurfaces

被引:41
作者
Wang, Zhuo [1 ,2 ]
Yao, Yao [1 ,2 ]
Pan, Weikang [3 ]
Zhou, Haoyang [1 ,2 ]
Chen, Yizhen [3 ]
Lin, Jing [1 ,2 ]
Hao, Jiaming [4 ]
Xiao, Shiyi [5 ]
He, Qiong [1 ,2 ]
Sun, Shulin [3 ,6 ]
Zhou, Lei [1 ,2 ]
机构
[1] Fudan Univ, State Key Lab Surface Phys, Minist Educ, Shanghai 200433, Peoples R China
[2] Fudan Univ, Key Lab Micro & Nano Photon Struct, Minist Educ, Shanghai 200433, Peoples R China
[3] Fudan Univ, Shanghai Engn Res Ctr Ultra Precis Opt Mfg, Sch Informat Sci & Technol, Dept Opt Sci & Engn, Shanghai 200433, Peoples R China
[4] Fudan Univ, Inst Optoelect, Shanghai 200433, Peoples R China
[5] Shanghai Univ, Shanghai Inst Adv Commun & Data Sci, Shanghai 200444, Peoples R China
[6] Yiwu Res Inst Fudan Univ, Chengbei Rd, Yiwu City 322000, Zhejiang, Peoples R China
基金
中国国家自然科学基金;
关键词
circular polarization; dielectric; spin-multiplexed metasurface; transmission configuration; wavefront controls; PROPAGATING WAVES; POLARIZATION; GENERATION; PHASE; BEAMS; REFLECTION; RESOLUTION; HOLOGRAMS;
D O I
10.1002/advs.202205499
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Multifunctional terahertz (THz) devices in transmission mode are highly desired in integration-optics applications, but conventional devices are bulky in size and inefficient. While ultra-thin multifunctional THz devices are recently demonstrated based on reflective metasurfaces, their transmissive counterparts suffer from severe limitations in efficiency and functionality. Here, based on high aspect-ratio silicon micropillars exhibiting wide transmission-phase tuning ranges with high transmission-amplitudes, a set of dielectric metasurfaces is designed and fabricated to achieve efficient spin-multiplexed wavefront controls on THz waves. As a benchmark test, the photonic-spin-Hall-effect is experimentally demonstrated with a record high absolute efficiency of 92% using a dielectric metasurface encoded with geometric phases only. Next, spin-multiplexed controls on circularly polarized THz beams (e.g., anomalous refraction and focusing) are experimentally demonstrated with experimental efficiency reaching 88%, based on a dielectric meta-device encoded with both spin-independent resonant phases and spin-dependent geometric phases. Finally, high-efficiency spin-multiplexed dual holographic images are experimentally realized with the third meta-device encoded with both resonant and geometric phases. Both near-field and far-field measurements are performed to characterize these devices, yielding results in agreement with full-wave simulations. The study paves the way to realize multifunctional, high-performance, and ultra-compact THz devices for applications in biology sensing, communications, and so on.
引用
收藏
页数:8
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