Gate-tuned graphene meta-devices for dynamically controlling terahertz wavefronts

Li, Qiushi1; Cai, Xiaodong1; Liu, Tong2,3; Jia, Min2,3; Wu, Qiong2,3; Zhou, Haoyang2,3; Liu, Huanhuan4; Wang, Qianqian1; Ling, Xiaohui5; Chen, Cong6; Ding, Fan7; He, Qiong2,3,8,9; Zhang, Yuanbo2,3,8,9; Xiao, Shiyi1; Zhou, Lei2,3,8,9

2022-03-01

10.1515/nanoph-2021-0801

Nanophotonics   影响因子和分区

2192-8606

2192-8614

Dynamical controls on terahertz (THz) wavefronts are crucial for many applications, but available mechanism requests tunable elements with sub-micrometer sizes that are difficult to find in the THz regime. Here, different from the local-tuning mechanism, we propose an alternative approach to construct wavefront-control meta-devices combining specifically designed metasurfaces and globally tuned graphene layers. Coupled-mode-theory (CMT) analyses reveal that graphene serves as a tunable loss to drive the whole meta-device to transit from one functional phase to another passing through an intermediate regime, exhibiting distinct far-field (FF) reflection wavefronts. As a proof of concept, we design/fabricate a graphene meta-device and experimentally demonstrate that it can reflect normally incident THz wave to pre-designed directions with different polarizations under appropriate gating voltages. We finally design a graphene meta-device and numerically demonstrate that it can generate vectorial THz beams with continuously varying polarization distributions upon gating. These findings pave the road to realizing a wide range of THz applications, such as sensing, imaging, and wireless communications.

coupled mode theory graphene metasurfaces terahertz wavefront manipulations

SCI ; EI

英语

ESI高被引

其他

National Key Research and Development Program of China["2017YFA0303504","2017YFA0700201"] ; National Natural Science Foundation of China[62175141,11734007,62192771,91850101] ; Shanghai Science and Technology Committee["18QA1401800","20JC1414601","20JC1414602"]

Science & Technology - Other Topics ; Materials Science ; Optics ; Physics

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Optics ; Physics, Applied

WOS:000776299200001

WALTER DE GRUYTER GMBH

20221712011455

Polarization ; Terahertz waves ; Wavefronts

Electromagnetic Waves:711 ; Nanotechnology:761 ; Chemical Products Generally:804

Web of Science

1.Shanghai Univ, Shanghai Inst Adv Commun & Data Sci, Key Lab Specialty Fiber Opt & Opt Access Networks, Joint Int Res Lab Specialty Fiber Opt & Adv Commu, Shanghai 200444, Peoples R China
2.Fudan Univ, Key Lab Micro & Nano Photon Struct, State Key Lab Surface Phys, Minist Educ, Shanghai 200433, Peoples R China
3.Fudan Univ, Phys Dept, Shanghai 200433, Peoples R China
4.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
5.Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang 421002, Peoples R China
6.Wuhan Univ, Sch Elect Informat, Wuhan 430072, Peoples R China
7.China Ship Dev & Design Ctr, Wuhan 430064, Peoples R China
8.Fudan Univ, Acad Engn & Technol, Shanghai 200433, Peoples R China
9.Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China

Li, Qiushi,Cai, Xiaodong,Liu, Tong,et al. Gate-tuned graphene meta-devices for dynamically controlling terahertz wavefronts[J]. Nanophotonics,2022,11:2085-2096.

Li, Qiushi.,Cai, Xiaodong.,Liu, Tong.,Jia, Min.,Wu, Qiong.,...&Zhou, Lei.(2022).Gate-tuned graphene meta-devices for dynamically controlling terahertz wavefronts.Nanophotonics,11,2085-2096.

Li, Qiushi,et al."Gate-tuned graphene meta-devices for dynamically controlling terahertz wavefronts".Nanophotonics 11(2022):2085-2096.